Technical Library

Seismic Data, Processing, Technology, Well Data Reports and Industry and Trade Publication Features, from the Experts at TGS

A case study: Geologically guided tomography to improve image below the Aptian unconformity, offshore Gambia

April 22, 2019
Kim, Taejong
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High-resolution tomographic inversion with image-guided preconditioning and offset dependent picking

April 22, 2019
Hilburn, Guy
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Creating a 3D Image from 2D Data, a Case Study from Hera Subbasin, Offshore Indonesia

April 11, 2019
Notiyal, Subodh
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Suprasalt model building using full-waveform inversion

March 22, 2019
TGS
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The application of full-waveform inversion (FWI) to bring high resolution to the velocity model is becoming a standard approach in the velocity.

MSGBC: Where is the next success?

October 25, 2018
TGS

Salt tectonic styles in the spreading basin: Yucatan, Offshore Mexico

October 14, 2018
TGS
The TGS Gigante project is comprised of 188,497 km of 2D seismic data acquired in 2016 and primarily covering the offshore Mexican side of the Gulf of.

Exploring the Norwegian Atlantic Margin: Møre and Vøring Basins

June 1, 2018
BENT KJØLHAMAR, JAN LANGHAMMER, NICK WOODBURN, REIDUN MYKLEBUST and SIMON BALDOCK
By the end of 2018 TGS will have acquired a total of 45,000 km2 of high resolution 3D seismic across the Møre and Vøring Basins in the Norwegian Sea. This.

Liberia, A Fresh Approach

October 1, 2017
BEN SAYERS and ALEX BIRCH-HAWKINS, RUFUS TARNUE, GERRARD SPEAR, LAUREN MAYHEW,
Recent exploration in Liberia has not provided the commercial success we all want, with the most recent well, Mesurado-1 (drilled by ExxonMobil in Block.

Production Forecasting in the Scoop/Stack Play

September 1, 2017
Ted Mirenda and James Keay
Oklahoma is one of the most mature oil- and gas-producing states, yet the industry continues to innovate and make headlines with new investment.

Clari-Fi™ Broadband Processed 2D Seismic in Portugal and the Mid-North Sea High

September 1, 2016
SINDRE JANSEN, WILL BRADBURY and BENT ERLEND KJØLHAMAR
Clari-Fi™ is a broadband processing package which includes denoising, deghosting, designature and inverse-Q. A multi-domain denoising process attenuates.

New insight into Gulf of Mexico Well Success

October 1, 2015
TGS
By analyzing the reasons for success and failure of a given well, we can learn more about the hydrocarbon system in which the well was drilled and improve.

Deepwater Kwanza Basin. A Prospective Pre-Salt Province?

October 1, 2015
Cian O’Reilly, Dario Chisari, James Clarke, Sadiqah Musa, Dr. Jennifer Halliday, Ian Deighton, Erika Tibocha and Paul Chandler
TGS acquired a high resolution multi-client 3D seismic survey over Blocks 35, 36 and 37 in the Kwanza Basin offshore Angola. A 3D Kirchhoff and Reverse.

The Seismic Wow Factor- A precursor To Unlocking Offshore Mexico

October 1, 2015
Brad Torry
Volatile hydrocarbon prices are driving major changes in the industry. Companies are establishing new economic baselines and new criteria for evaluating.

Gulf of Mexico: Post Well Analysis

September 1, 2015
Alessio Checconi, Peter Conn, David Little, Edward Smith, James Stockley, Erika Tibocha;
 In order to assess the four key risk factors for exploration – reservoir, trap, seal, and charge (source and migration) – an interdisciplinary approach.

The Hoop Area: New testing ground for geophysical technologies

May 1, 2015
Bent Kjølhamar
The Hoop Basin was named after Der Hoop, a ship belonging to one of the great Arctic explorers, William Barents. Meaning ’hope’ in his native Dutch, this.

Advances in Seismic Rejuvenate Shelf

February 1, 2015
Brad Torry
As 2015 begins amid uncertainty about commodity prices, one region in the Gulf of Mexico bears an interesting revival that should survive these prices.

Hoop Basin: Drilling success and playground for new exploration methods

September 1, 2014
BENT KJØLHAMAR, CHRISTOPHER SÆBØ SERCK, CAMILLA BROCH PEDERSEN, REIDUN MYKLEBUST
The Hoop Fault Complex area of the Barents Sea has seen great exploration success lately. The area offers a condensed Paleozoic and Mesozoic succession.

Eastern Canada has plenty to offer

May 1, 2014
Brad Torry and Steve Whidden
Exploration off eastern Canada has become somewhat muted. But a recent renaissance of drilling and seismic activity has unearthed new reserves, new basins.

Early basin insights and AVO supported leads from new long offset 2D seismic data, Labrador Sea, Canada

March 1, 2014
Richard Wright, James Carter, Deric Cameron, Tom Neugebauer, Jerry Witney, and Daniel Hughes
The first regionally extensive long offset 2D seismic program has been acquired in the slope and deepwater regions of the Labrador Sea, offshore Canada..

New insights on the Alaskan Chukchi Sea

March 1, 2014
Brad Torry, Thane Strandberg, Abu Chowdhury, Jason Kegel, James Keay
operationally challenging, environmentally sensitive and seasonally limited; the vast bounds of the underexplored basins of the arctic region remain of.

Danish sector: Insight into mature and deeper plays

October 1, 2013
Will Bradbury, Steve Drewell, Gulnara Hickman
TGS' new regional 2D long-offset seismic survey of the Danish sector employs innovative processing techniques already proven in the North Sea and around.

Implementation of Kirchhoff prestack depth migration on GPU

September 17, 2013
TGS
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The massively parallel nature of Graphics Processing Units has made them an attractive platform for some computationally intensive algorithms. This.

Enhancement of seismic data quality and interpretation for mapping base Zubair sands of Southeast Kuwait

September 16, 2013
TGS
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The Lower Zubair sand reservoirs have produced or shown oil in several but not all of the wells drilled in western and southeastern Kuwait. Evidence from.

Broadband processing of linear streamer data

September 15, 2013
TGS
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Conventional marine seismic data is affected by the interference from ghosts on both the source and receiver sides. The natural diversity provided by.

Anisotropic model building with structurally constrained tomography inversion: A case study from the Angola Basin

September 14, 2013
TGS
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The Angola basin is characterized by steeply dipping sediments with rapid changes in dip direction particularly in mini-basins between salt bodies. This.

Angle domain illumination analysis along a target horizon

September 12, 2013
TGS
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We develop an efficient scheme of illumination analysis along a target horizon. With this scheme, we can calculate the Directional Illumination (DI) from.

A case study for salt model building using CFP full azimuth data

September 10, 2013
TGS
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We present a case study of the salt model building for a Gulf of Mexico area with a full azimuth (FAZ) dataset that was created by merging two orthogonal.

3D imaging from 2D seismic data, an enhanced methodology

September 8, 2013
TGS
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We have developed an enhanced methodology for creating a 3D seismic migration volume from a set of 2D seismic lines. The key challenge is to interpolate.

3C receiver orientation estimation by stack power optimization of reflected PS data

September 2, 2013
TGS
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In land multi-component (MC) data processing, the orientation of each receiver's horizontal components in the field (H1 and H2) is seldom known.

Increasing the bandwidth of marine seismic data - broadband

September 1, 2013
TGS
Broadband seismic data is data that is rich in both low and high frequencies. High frequencies increase temporal resolution, and low frequencies reduce.

The value of PRM in enabling high-payback IOR Programs

September 1, 2013
TGS
Innovative uses of seabed seismic technology will help operators glean billions from new and mature fields. High-potential returns with low risk and lower.

Current workflows for shale gas reservoir characterization

August 14, 2013
Arcis Seismic Solutions
n the last decade and more, shale gas resources have emerged as a viable energy source. This became possible after the Mississippian Barnett Shale in the.

Key processing techniques for pre-salt plays

August 2, 2013
TGS
Abacia de Campos do Brasil é uma das regiões offshore mais ativas e prósperas de petróleo e gás no mundo, com o maior número de descobertas de petróleo e.

Seabed Sampling for Stratigraphy and Seep Studies Offshore Greenland and Norway

June 12, 2013
TGS
Gravity coring and dredging has been used to obtain extensive seabed sampling of escarpments and potential hydrocarbon seep sites offshore Greenland in.

Practical aspects of least-squares reverse time migration

June 8, 2013
TGS
Conventional migration tools have been implemented by the application of adjoint operators. Under simple circumstances this approach provides satisfactory.

Orthorhombic imaging for orthogonal wide azimuth surveys in Mississippi Canyon, Gulf of Mexico

June 6, 2013
TGS
Wide azimuth (WAZ) has been established as an indispensable seismic acquisition and processing methodology for exploration and development objectives..

Enhanced 3D Imaging from 2D Seismic Data and its Application to Surveys in the North Sea

June 5, 2013
TGS
In some of the newly explored areas around the world, 3D seismic surveys may not be available. Assessment of the exploration potential and in some cases,.

Broadband Processing of Conventional Streamer Data - Optimized De-Ghosting in the Tau-P Domain

June 3, 2013
TGS
The frequency content and the temporal resolution of marine seismic data acquired using conventional constant-depth streamer is affected by the.

A 3D Illumination Study to Investigate Fault Shadow Effects over the Hoop Fault Complex

June 2, 2013
TGS
Seismic exploration of the Norwegian Barents Sea began over thirty years ago, but the acquisition of 3-D surveys have only commenced in recent years. The.

Enabling high payback IOR: Value creation through PRM

April 1, 2013
MARTIN BETT
Innovative uses of seabed seismic technology can help operators glean billions from new and mature fields. High potential returns with low risk and lower.

Good guidance

Advances in technology have allowed for old geophysical records to be put online, enabling technologically adept operators to conduct geological analysis.

Increasing the bandwidth of marine seismic data

April 1, 2013
Simon Baldock
Marine seismic data acquired with an airgun source and recorded using pressure sensors towed at a constant depth has been the standard for offshore oil.

How the seismic map is changing

February 1, 2013
Andrew McBarnet
Andrew McBarnet assesses the state of the marine seismic business and where it is going in 2013.

New approach to basin formation temperature modeling

December 1, 2012
Pete Dotsey
Basin formation temperatures are an important consideration in oil and gas exploration and development because temperature controls the rates of chemical.

Pre-processing improvements for enhanced PSTM and TTI PSDM images in the santos basin: A case history

December 1, 2012
Kev Pavloske, Jana Beyoglu, Tefera Eshete and Simon Baldock
The Santos Basin, offshore Brazil, is a geophysically challenging area to image due to the presence of evaporite sequence layers, carbonate layers and.

The value of PRM in enabling high payback IOR

December 1, 2012
MARTIN BETT
Innovative uses of seabed seismic technology can help operators achieve considerably higher returns from new and mature fields. High potential returns.

Shale gas reservoir characterization workflows

November 26, 2012
Arcis Seismic Solutions
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As shale gas resources have emerged as a viable energy source, their characterization has gained significance. The organic content in these shales which.

Seismic attribute expression of differential compaction

November 25, 2012
Arcis Seismic Solutions
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In a marine environment, topographic features on the sea floor will usually be covered by a thick layer of shale with the rise of sea level, resulting in.

Remove RTM Artifacts Using Delayed Imaging Time Gathers

November 24, 2012
TGS
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In RTM imaging, double top salt (DTS) is frequently seen but difficult to remove by conventional post-RTM processing. This paper analyzes the DTS.

Q tomography towards true amplitude image and improve sub-karst image

November 23, 2012
TGS
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A frequency domain tomographic inversion was developed to estimate frequency dependent energy attenuation by using prestack depth migration common image.

Limits on resolution enhancement for multicomponent data

November 21, 2012
Chuck Ursenbach
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Two methods have recently been published for carrying out nonstationary spectral broadening (and narrowing) of PS data after it has been mapped into the.

Marine broadband seismic: Is the earth response helping the resolution revolution?

November 21, 2012
TGS
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Broadband seismic aims to provide a greater richness of both (a), robust low frequencies – ideal for deep structure imaging, and (b), high frequencies –.

Lifetime stability and reliability of fibre-optic seismic sensors for permanent reservoir monitoring

November 20, 2012
TGS
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Permanent reservoir monitoring (PRM) using seabed arrays of seismic sensors is becoming a well recognised tool for optimizing production and increasing.

Least-squares reverse time migration: towards true amplitude imaging and improving the resolution

November 19, 2012
TGS
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A 3D inversion based Least-Squares Reverse Time Migration (LSRTM) technique was developed. The algorithm uses the RTM as the forward modeling and.

Iterative velocity model building using GPU based layer-stripping TTI RTM

November 18, 2012
TGS
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The technology of using Tilted Transverse Isotropic Reverse Time Migration (TTI RTM) for subsalt velocity model building has been playing an important.

Interesting directions being pursued in seismic curvature attribute analysis

November 17, 2012
Arcis Seismic Solutions
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Seismic curvature attribute analysis forms an integral part of most interpretation projects as they yield useful information that adds value for the.

Improvements in time domain FWI and its applications

November 16, 2012
TGS
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In this abstract, we describe how to improve time domain full waveform inversion using source wavelet convolution, windowed back propagation and source.

Improved time and anisotropic depth imaging in the Appalachian Foothills

November 15, 2012
TGS
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We present an imaging methodology that resulted in significant enhancements in defining the subsurface geology in a survey in the Appalachian Foothills..

Improved quality for common focusing point data regularization

November 14, 2012
TGS
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The data driven 3D true azimuth Common Focusing Point (CFP) data regularization technique is a multi-dimensional data regularization tool. It can be used.

High-resolution Moveout Transform; a robust technique for modeling stackable seismic events

November 12, 2012
TGS
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We propose a time-domain approach to transform a gather of pre-stack seismic data into an ensemble of highlyresolved traces in the transformed domain..

Enhanced imaging using bandwidth extending operators and pre-stack Q-inversion over the northwest European volcanic margin

November 10, 2012
TGS
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Extensive sequences of flood basalts dominate the northwest European Atlantic margin. The basalt flows absorb and scatter the higher frequencies present.

Directional Imaging Stack (DIS) for Shot Based Pre-stack Depth Migrations

November 7, 2012
Wilfred Whiteside
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Shot based pre-stack depth migrations such as RTM are used to generate a partial image volume for each input shot gather. The conventional migrated image.

Compensating visco-acoustic effects in anisotropic resverse-time migration

November 6, 2012
TGS
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Anelastic properties of the earth cause frequency dependent energy attenuation and phase distortion in seismic wave propagation. It is preferred that.

Complex Structural Imaging in the Tarakan Basin – A Case Study, Offshore Indonesia

November 5, 2012
TGS
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Increased industry exploration interest in the Tarakan Basin, offshore East Kalimantan, Indonesia, has stimulated a need for 3D seismic data that.

5D leakage: measuring what 5D interpolation misses

November 3, 2012
Peter Cary
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5D interpolation methods have proven to be capable of overcoming the constraints of actual data acquisition in a wide range of situations. However, in.

Bringing broadband to the subsea

November 1, 2012
Simon Baldock and Nick Myziuk
Seismic data acquired with an airgun source and recorded on pressure sensors has been the standard for offshore oil and gas exploration for many years..

New attribute for determination of lithology and brittleness

September 22, 2012
Arcis Seismic Solutions
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The discrimination of fluid content and lithology in a reservoir is an important characterization that has a bearing on reservoir development and its.

A comparison of structural styles and prospectivity along the Atlantic margin from Senegal to Benin

September 5, 2012
TGS
The structural style of the African Atlantic margin shows significant differences between the passive rifted Northwest African Atlantic Margin (offshore.

Orthogonal wide azimuth surveys:

September 1, 2012
Simon Baldock, Cristina Reta-Tang, Brad Beck, Wei Gao, Jun Cai, and Steve Hightower
Wide azimuth seismic surveying is firmly established as a key element in subsalt exploration and production in the Gulf of Mexico. The challenge now.

Orthogonal wide azimuth surveys: Aquisition and imaging

September 1, 2012
Simon Baldock, Cristina Reta-Tang, Brad Beck, Wei Gao, Jun Cai, and Steve Hightower
Wide azimuth seismic surveying is firmly established as a key element in subsalt exploration and production in the Gulf of Mexico. The challenge now.

Spatial Distribution of Trap Types Relative to the Regional Structural Framework, Baffin Bay, Offshore Greenland

June 14, 2012
TGS
The Baffin Bay area offshore northwest Greenland represents a vast frontier exploration province. The aim of this work has been to create a new structural.

Reducing Uncertainties in Anisotropic Tomography

June 7, 2012
TGS
One of the fundamental challenges for anisotropic tomography is the trade-off between the inverted velocity correction and the anisotropic parameters.

Practical Aspects of Subsalt Tomography Using Reverse Time Migration Based Angle Gathers

June 4, 2012
TGS
Due to the accuracy of the Reverse Time Migration (RTM) algorithm, RTM angle gathers show more coherent and correct moveout subsalt events than Kirchhoff.

High-resolution Moveout Transform - A Robust Multiple Attenuation Technique

June 2, 2012
TGS
As an alternative to the conventional high-resolution Radon transform, we propose a time-domain approach to transform a gather of pre-stack seismic data.

Geological review of deepwater liberian basin outlines prospectivity

April 1, 2012
Muhammad S. Tamannai, Ian Deighton, and Peter Conn
The Liberian basin comprises offshore Liberia and Sierra Leone. Details of the regional structure and petroleum prospectivity of this frontier margin have.

Enhanced low frequency signal processing for sub-basalt imaging

February 21, 2012
Nick Woodburn
Lower frequency energy in the source wavelet is more likely to penetrate through the basalt than higher frequencies as it is less attenuated by intrinsic.

Advances in deepwater reservoir monitoring

February 2, 2012
MARTIN BETT
With the market for Permanent Reservoir Monitoring (PRM) continuing to grow along with deepwater field expenditure (Douglas-Westwood forecasts global deep.

Improved 3D seismic imaging through depth migration and tomography: An Indonesia case study

January 1, 2012
Jianli Song, Cristina Reta-Tang, Xuening Ma, Jim Wilhite and Laurie Geiger
TGS has vast seismic experience in the Asia-Pacific region, including acquisition and advanced time and depth processing. Here we present a case study of.

Enhanced prestack depth imaging of wide-azimuth data

October 1, 2011
Xuening Ma, Bin Wang, Cristina Reta-Tang, Wilfred Whiteside, and Zhiming Li
We present a case study of enhanced imaging of wideazimuth data from the Gulf of Mexico utilizing recent technologies; and we discuss the resulting.

Postmigration multiple prediction and removal in the depth domain

October 1, 2011
Bin Wang, Jun Cai, Manhong Guo, Chuck Mason, Sampath Gajawada, and Duryodhan Epili
We have developed a new methodology for predicting and removing multiples in the postmigration depth domain based on wavefield extrapolation and.

Orthogonal Wide Azimuth Surveys: Acquisition and Imaging

September 21, 2011
Simon Baldock, Cristina Reta-Tang, Brad Beck, Wei Gao, Jun Cai, and Steve Hightower
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We present results from a case study being performed in the Gulf of Mexico (GoM) that utilizes two orthogonal Wide Azimuth (WAZ) surveys to create an.

Maximizing Throughput for High Performance TTI-RTM: From CPU-RTM to GPU-RTM

September 19, 2011
TGS
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The implementation and production application of fast Reverse Time Migration (RTM) algorithms, especially for Tilted Transverse Isotropic (TTI) medium, is.

Layer-stripping RTM based on wavefield redatuming

September 17, 2011
TGS
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Tilted Transverse Isotropic (TTI) Reverse Time Migration (RTM) is routinely used for depth velocity model building. To improve the efficiency of RTM we.

Improved subsalt imaging using TTI anisotropy and reverse time migration scans

September 17, 2011
TGS
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We present an advanced velocity model building and imaging methodology that resulted in significant enhancements in defining the salt flanks with.

Imaging the Hoop Fault Complex via horizon and fault constrained tomography

September 16, 2011
TGS
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The Hoop Fault complex in the Southwestern Barents Sea presents an imaging challenge to accurately model the sharp velocity contrast across a major fault.

Expanding domain methods in GPU based TTI reverse time migration

September 16, 2011
Sang Suh
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Three expanding domain methods are studied which include: (1) constant velocity layer, (2) eikonal equation solver and (3) amplitude comparison. The layer.

Detailed velocity model building in a carbonate karst zone and improving sub-karst images in the Gulf of Mexico

September 14, 2011
TGS
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A velocity anomaly zone with high contrasts and small wavelength variations is often a challenge for conventional depth imaging. It requires model details.

Automatic RTM-based DIT scan picking for enhanced salt interpretation

September 13, 2011
TGS
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Delayed Imaging Time (DIT) scans based on Reverse Time Migration (RTM) are often used in production to update velocity models, particularly in subsalt or.

Applications of Layer-Stripping RTM to Gulf of Mexico Imaging Projects

September 12, 2011
TGS
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We have applied layer-stripping Reverse Time Migration (RTM) to several Gulf of Mexico (GOM) depth imaging projects. The key element of layer-stripping.

Merging multiple surveys before imaging

September 10, 2011
TGS
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We present a redatuming data regularization technique based on a 3D true azimuth Common Focusing Point (CFP) technique. It can effectively merge different.

A case study: Improved subsalt imaging through TTI model building and imaging of a WAZ survey in the Gulf of Mexico

September 8, 2011
TGS
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Here we present a case study of improved subsalt imaging for a wide azimuth (WAZ) survey in the Mississippi Canyon/Atwater Valley area in the Gulf of.

Anisotropic tomography for TTI and VTI media

September 6, 2011
TGS
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A simultaneous anisotropic tomographic inversion algorithm is developed. Check shot constraints and appropriate algorithm preconditioning play an.

3D RTM angle gathers from source wave propagation direction and dip of reflector

September 3, 2011
TGS
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Creating an angle gather is a conceptually simple process of plotting reflection amplitudes along the angle. Reflection or opening angle can be directly.

Complex salt model building using a combination of interactive imaging and layerstripping RTM

July 1, 2011
Bin Wang, Chuck Mason, Kwangjin Yoon, Jean Ji, Jun Cai, Sang Suh and Zhiming Li
A new methodology for building salt velocity models is proposed that allows effective testing of different salt interpretation scenarios. In this.

New insights into prospectivity of Liberia-Sierra Leone Basin because of improvements in seismic acquisition and processing

June 1, 2011
Peter Conn and Gary Rodriguez
This paper examines how the understanding of the prospectivity of the Liberia-Sierra Leone Basin has developed over the last 40 years largely due to.

Modelling low velocities in carbonate karst zones and improving sub-karst images in the Gulf of Mexico

May 11, 2011
TGS
A velocity anomaly zone with high contrasts and small wave length variations is often a challenge for conventional depth imaging. It requires model.

Horizon and fault constrained tomography to model fault induced velocity discontinuities in the hoop fault complex area

May 9, 2011
TGS
We present a case study that uses different methods of addressing a sharp velocity contrast across a major fault boundary in the southwestern Barents Sea..

Automated RTM-based DIT scans for salt interpretation and model building

May 2, 2011
TGS
Reverse Time Migration (RTM) based Delayed Imaging Time (DIT) scans have been used routinely in production to update velocity models in subsalt or low.

Improved imaging

April 1, 2011
Peter Conn and Gary Rodriguez
This paper examines how the understanding of the prospectivity of the Liberia-Sierra Leone Basin has developed over the last 40 years largely due to.

Logs reveal Marcellus sweet spots

March 1, 2011
Pete Dotsey
Sweet spots in the Marcellus gas shale trend are being mapped by performing geologic and petrophysical evaluation and interpretation of well log data. Log.

Imaging sub-basalt palaeocene, mesozoic and palaeozoic targets in the deep water UKCS margin: Combining effective reprocessing strategies with new deep towed acquiston

November 9, 2010
TGS
In 2009 TGS acquired 2,947 km of 2D long-offset multi-client data in the Atlantic Margin across the far northeastern part of the Faroe-Shetland Basin.

Processing Challenges from Arctic Latitudes: Attenuation of Diffraction Multiples from Ice-scouring Tracks

November 8, 2010
Shell
Over the past 10 years TGS has built up a substantial geophysical database offshore Greenland. This includes over 64,000km of 2D seismic, much of which.

Greenland - Summary of hydrocarbon geology and structural elements

November 7, 2010
TGS
The sedimentary basins in the Baffin Sea, Davies Strait and Labrador Sea are surrounded by old continents consisting of 2.4 to 3.6 bill year Proterozoic.

Amplitude preserving demultiple in the Barents Sea over the Hoop Fault Complex: Deconstructing SRME and a new alternative method for stacking the near offsets

November 2, 2010
TGS
In 2009 TGS acquired 2,770 km2 of multi-client seismic data in the southwestern Barents Sea across the Hoop Fault Complex covering acreage nominated in.

Salt geology and hydrocarbon plays in the northeastern Gulf of Mexico

November 1, 2010
Abu Chowdbury
The source rock for the hydrocarbons in the Upper Jurassic, Cretaceous, and Tertiary reservoirs in the eastern Gulf of Mexico is postulated to be Upper.

Stepwise Multiple Elimination using Linear Transforms: An alternative approach to SRME for stacking multiple-free near offsets in the Barents Sea

October 17, 2010
TGS
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A novel, de-aliased method called Stepwise Multiple Elimination using Linear Transforms (SMELT) is introduced as an alternative to 2-D Surface Related.

Stability and speedup issues in TTI RTM implementation

October 15, 2010
TGS
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In the implementation of TTI RTM, we meet stability problems and demands for speedup. Staggered Fourier first derivative and linear interpolation improves.

Mississippi Canyon high resolution reprocessing: applications for shallow drilling hazard and geologic evaluation

October 12, 2010
TGS
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A joint contractor-company project was undertaken to evaluate the practicality and utility of shallow high resolution reprocessing of large deepwater.

Interactive demultiple in the post-migration depth domain

October 11, 2010
TGS
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In efforts to further improve final migrated images we have developed a new methodology for post-migration multiple removal in the migration depth domain..

Enhanced pre-stack depth imaging of wide-azimuth data from the Gulf of Mexico: a case history

October 8, 2010
TGS
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We present a case study of enhanced imaging of wideazimuth data from the Gulf of Mexico utilizing recent technologies; and we discuss the resulting.

True azimuth surface multiple elimination

October 7, 2010
TGS
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A data driven 3D true azimuth surface related multiple elimination (SRME) technique can be quite effective in removing surface related multiples for both.

Imaging beneath the Florida Escarpment progressing from 2D, 3D and anisotropy : A case history

October 5, 2010
Gary Rodriguez
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The long history of imaging in this area will be reviewed. Incremental improvements in data quality and interpretability will be shown. Processing efforts.

Benin Ultradeep seismic study reveals transform margin and potential hydrocarbon prospectivity

September 10, 2010
TGS
The Benin Ultradeep seismic survey was acquired by TGS in 2009. 2D migrated seismic data shows the boundary between oceanic and stretched continental.

Depositional Environment and Structural Style of Permian and Triassic Sequences of Wrangel Island, Russian Arctic

September 5, 2010
TGS
Chukchi and East Siberian Seas region represents one of the most remote and poorly studied areas of East Arctic. Wrangel Island is located between East.

The Structure of the Wrangel Arch (Russian Chukchi Sea), Based on Marine Seismic and Onshore Observations

September 3, 2010
TGS
Wrangel Arch represents the extensive (more, than 500 km) ~ E-W trending oshore basement high, separating the well-known shelf depressions: North and.

Lows and highs: using low frequencies and improved velocity tools to image complex ridges and basement highs in the Faroe-Shetland Basin

September 1, 2010
Anthony Hardwick, Tom Travis, Simon Stokes and Matthew Hart
In January 2010 TGS completed the reprocessing of two regional long offset 2D multi-client seismic surveys in the Faroe-Shetland Basin (FSB). This.

Complex-salt model building using a combination of interactive beam migration and layer-stripping RTM

June 8, 2010
TGS
A new salt velocity model building methodology is proposed which allows effective testing of different salt interpretation scenarios. In this methodology,.

Anisotropic Depth Migration and High-Resolution Tomography in Gulf of Mexico: A Case History

June 6, 2010
TGS
We present a case study of an anisotropic prestack depth migration (APSDM) project which used high-resolution, shallow tomography and anisotropic model.

The Structural Evolution and Tectonic Development of the Laptev Sea Region in Mesozoic and Cenozoic

June 5, 2010
TGS
This study is based on the series of field works on Bel kov Island (Eastern Laptev Sea region) and Khatanga Bay area (Western Laptev Sea region). It is.

Improved Sub-basalt Structural Imaging in the Faroe-Shetland Basin Using Full Sequence Migration Multi-velocity Analysis

June 3, 2010
TGS
It is widely accepted that the key to successful sub-basalt imaging in the Atlantic Margin region is to generate as much low frequency energy as possible..

The prospectivity of Offshore Sierra Leone Using Newly Acquired 3D data

April 6, 2010
TGS
Based on a previous 2D seismic survey in offshore Sierra Leone and Liberia revealing the exploration potential of the margin, a 3D long offset survey in.

Western Laptev Sea Region Framework - Structural Style and Timing of Deformation

April 2, 2010
TGS
The Laptev Sea region is one of the remote and geologically complex areas of Russian Eastern Arctic. According to the existing seismic data, a number of.

Full wave-equation methods for complex imaging challenges

March 1, 2010
PAUL WILLIAMSON, BIN WANG, DIMITRI BEVC, IAN JONES
Despite being at the end of a long and full Annual Meeting week, the workshop “Full wave-equation methods for complex imaging challenges,” held 30 October.

West of Shetland: Improved sub-basalt imaging

February 1, 2010
TGS
Extensive thick sequences of basalt dominate the northwest flank of the Faroe Shetland Basin. Recent reprocessing of this long offset data dramatically.

Cluster programming for reverse time migration

January 1, 2010
SANG YONG SUH, ALEX YEH, BIN WANG, JUN CAI, KWANGJIN YOON, and ZHIMING LI
Reverse time migration (RTM) is well suited for imaging steep dips in areas with high velocity contrast. In order to image steep dips at the correct.

Fast 3D target-oriented reverse-time datuming

December 1, 2009
Shuqian Dong, Yi Luo, Xiang Xiao , Sergio Chávez-Pérez , and Gerard T. Schuster
Imaging of subsalt sediments is a challenge for traditional migration methods such as Kirchhoff and one-way waveequation migration. Consequently, the more.

Subsalt velocity update and composite imaging using reverse-time-migration based delayed-imaging-time scan

December 1, 2009
Bin Wang, Chuck Mason, Manhong Guo, Huimin Guan, Kwangjin Yoon, and Zhiming Li
Subsalt wave-equation based migration (WEM) scan is an effective way for subsalt velocity updating, and has become an industry standard practice; however,.

Complex-salt model building using combination of interactive beam migration and localized RTM

October 21, 2009
TGS
tags icon SEG
A new salt velocity model building methodology is proposed which allows effective testing of different salt interpretation scenarios. In this methodology,.

Use of narrow azimuth data for enhanced Wavefield Extrapolation multiple prediction on a WAZ survey

October 18, 2009
TGS
tags icon SEG
There has been a continually expanding interest in wide azimuth (WAZ) data in all its variations. We are now challenged to take full advantage of the.

An Integrated Approach to Hydrocarbon Prospectivity in the South Western Barents Sea

October 18, 2009
TGS
Large areas of the south western Barents Sea remain unexplored. An integrated approach to the understanding of the south western Barents Sea is presented.

Salt interpretation validated by salt tectonic study in the offshore Gulf of Mexico

October 17, 2009
TGS
tags icon SEG
To identify and define a complex salt body with rugose top and base is essential in building an accurate velocity model for premium quality depth imaging..

Geological Structure of South-Western Laptev Sea Region

October 16, 2009
TGS
Russian Eastern Arctic shelf, including Laptev Sea, represents one of the most promising offshore areas for hydrocarbon discoveries. Nevertheless, due to.

Wave-equation based residual multiple prediction and elimination in migration depth domain as an aid to seismic interpretation

October 15, 2009
TGS
tags icon SEG
We have developed a new methodology for predicting and removing multiples in the migration depth domain based on wavefield extrapolation and attribute.

Arctic Magmatism: Distribution, Age and Implications for Basin Development and Petroleum Systems in the Barents Sea

October 14, 2009
TGS
The sedimentary basin development of the Barents Sea has been influenced by the formation of three Large Igneous Provinces (LIPS): The end-Permian (ca..

Source separation of simultaneous source OBC data

October 13, 2009
TGS
tags icon SEG
To attain the benefits of simultaneous shooting in marine data acquisition, either the simultaneous sources have to be placed far apart to minimize the.

Structure and Development of the Conjugate mid-Norway - NE Greenland Margins

October 13, 2009
TGS
The continental margins off mid-Norway and NE Greenland share a common geological history leading up to breakup in earliest Eocene. The geology offshore.

Constrained propeller ship noise removal and its application to OBC data

October 11, 2009
TGS
tags icon SEG
A constrained propeller ship noise removal technique for OBC data has been developed. The constraints include the ship lane information, global linear.

Reverse-time migration by fan filtering plus wavefield decomposition

October 10, 2009
TGS
tags icon SEG
The conventional zero-lag crosscorrealtion imaging condition of reverse-time migration is subject to strong migration artifacts. This paper studies.

Sedimentary Evolution of Paleozoic and Triassic Sequences of Wrangel Island

October 9, 2009
TGS
Wrangel Island is located between East Siberian and Chukchi Seas and composed of metamorphic Wrangelian Complex and overlying Silurian, Devonian,.

The Geological Structure and Hydrocarbon Potential of East Barents Sea Region: from Overview and Comparison to the Norwegian Barents

October 8, 2009
TGS
Here we present the synthesis of available/published geological and geophysical data on Barents Sea region, including TGS/NGP seismic data (2005) and.

Sedimentary Basins of East Siberian and Chukchi Sea Shelf: the Structure and Hydrocarbon Potential

October 7, 2009
TGS
East Siberian and Chukchi Seas occupy vast area of Russian Eastern Arctic shelf, where very limited amount of seismic data is available and no offshore.

From SRME or wave-equation extrapolation to SRME and wave-equation extrapolation

October 6, 2009
TGS
tags icon SEG
Better de-multiple results are achieved by combining the strengths of SRME and wave field extrapolation techniques. In this paper, we illustrated three.

Freedom Wide-Azimuth Processing and Imaging, a case history study of WAZ imaging in Mississippi Canyon, Gulf of Mexico

October 5, 2009
TGS
tags icon SEG
Wide-azimuth (WAZ) data is the most significant advance to have occurred in seismic acquisition and processing since the introduction of 3D seismic in the.

Main Stages of the Tectonic Evolution of the Chukotka Peninsula and Adjacent Shelf

October 4, 2009
TGS
Metamorphic rocks of the Chukotka complex are exposed in the east Chukotka uplift and granitic-metamorphic domes (Koolen, Senyavin, Alyarmaut and etc.)..

Improved Imaging through Anisotropic Depth Migration and High-Resolution Shallow Tomography In Lieu Of Refraction Statics in South Timbalier Trench Area

October 3, 2009
TGS
tags icon SEG
We present a case study of an anisotropic prestack depth migration (APSDM) project which used high-resolution, shallow tomography and anisotropic model.

TTI/VTI anisotropy estimation by focusing analysis, Part II: application

October 2, 2009
TGS
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The workflow for the practical application of the automated focusing analysis in time domain is demonstrated by deriving the TTI anisotropy parameters,.

Significant improvements in subsalt imaging

October 1, 2009
TGS
Keeping up with the latest wide-azimuth processing methods will be a popular topic at the SEG this year. TGS-NOPEC Geophysical Co. (TGS) plans to.

TTI/VTI anisotropy parameters estimation by focusing analysis, Part I: theory

October 1, 2009
TGS
tags icon SEG
Time domain and depth domain focusing operators are introduced to estimate anisotropic parameters. The fully automated time domain focusing operator to.

Salt interpretation for depth imaging – where geology is working in the geophysical world

October 1, 2009
TGS
tags icon SEG
Accurate salt interpretation involves an integration of geology and geophysics. In the practice of salt interpretation and model building in depth.

Extended Abstract: The prospectivity of offshore Sierra Leone using newly acquired 3D data

September 7, 2009
TGS
Based on a previous 2D seismic survey in offshore Sierra Leone and Liberia revealing the exploration potential of the margin, a 3D long offset survey in.

Subsalt velocity update and composite imaging using RTM-based DIT scan

June 13, 2009
Bin Wang
Subsalt velocity updating (Wang et al., 2004, 2006) can be categorized into two approaches: 1) Datadriven subsalt tomography based on residual moveouts;.

The Northern Siberia Geology and Hydrocarbon Systems - Project and the First Results

June 3, 2009
TGS
The northern Siberia occupies a wide area with several sedimentary basins with high hydrocarbon potential. To the north from it there is the Laptev Sea.

Geological and Geophysical Evaluation of Offshore Morondava Frontier Basin based on Satellite Gravity, Well and regional 2D Seismic Data Interpretation

April 11, 2009
TGS
Madagascar is situated in the South West of the Indian Ocean at a distance of about 400 km off the East coast of Africa (figure 1). It is the third.

Multistep reverse time migration

April 1, 2009
H. Guan
Reverse time migration (RTM), being based on the two way wave equation, can accurately account for wave propagation in both up and down directions. As a.

Somaliland open for business

April 1, 2009
Judy Maksoud
Exploration activity is still opening new frontiers, with one of the most recent surveys targeting the Republic of Somaliland, an autonomous region in the.

A new approach to deepwater frontier exploration

February 1, 2009
Jane Whaley
When a company is considering a new frontier area for exploration, a number of crucial questions require a rapid answer. The foremost of these is whether.

Removing surface-related multiples just got better

January 1, 2009
Manhong Guo, Young Kim, Satyakee Sen, Jim Xu, Jing Xie and Bin Wang
Multiple reflections of seismic waves off of the seafloor have been keeping processing experts busy for years. To get a clear image of the subsurface, the.

Acquiring seismic data in The Arctic Realm

December 1, 2008
TGS
"We have just completed one of the most demanding seismic acquisition programmes we have ever undertaken˝, says Jørn Christiansen, principal advisor to.

Beam-based Interactive Imaging for Salt Interpretation and Salt Model Building

November 12, 2008
TGS
tags icon SEG
It is well understood that accurate salt interpretation is critical to subsalt imaging. When reflections from the saltsediment boundaries are not.

Challenges in Time & Depth: Imaging the Eastern Delta OBC Survey, a Case History

November 10, 2008
TGS
tags icon SEG
Immediately offshore of the Mississippi Delta the geological setting conspires with numerous production installations to produce a unique set of problems.

Impacts of Seismic Anisotropy and Subsalt Velocity Updates in Imaging, Deepwater Gulf of Mexico

November 9, 2008
TGS
tags icon SEG
Seismic anisotropy refers to seismic waves traveling with different velocity at different propagation angle, usually in consolidated, shale-prone areas.

A new multiple subtraction method using the attributes of predicted multiples

November 9, 2008
TGS
tags icon SEG
Despite the development of excellent techniques for predicting multiples such as convolution based or wavefield extrapolation based approaches,.

Localized reverse time migration for salt model building

November 9, 2008
TGS
tags icon SEG
Salt model building is a key process for successful subsalt imaging. In complex areas, Reverse Time Migration (RTM) provides better images than One-way.

Multiple Prediction by Wavefield Extrapolation in Common-P Domain

November 7, 2008
TGS
tags icon SEG
Wavefield extrapolation (WFE) multiple prediction typically operates in common shot domain, and is very effective to predict complex multiples such as.

A Multi-Step Approach for Efficient Reverse-Time Migration

November 6, 2008
TGS
tags icon SEG
Reverse-time migration (RTM) provides superior images in areas where there are steep salt flanks or other complex geologic structures. However, the high.

Enhanced Anisotropic Model Building Methodology and Pre-stack Depth Imaging in Deep Water Gulf Of Mexico: A case history

November 2, 2008
TGS
tags icon SEG
We present a case study of anisotropic model building and the resulting accuracy of event placement and improved image quality. Approximately 660 OCS.

Subsalt Velocity Update Using RTM-based DT Scan

November 2, 2008
TGS
tags icon SEG
Subsalt wave-equation based migration (WEM) scan is an effective way for subsalt velocity updating, and has become an industry standard practice; however,.

Advances in velocity model-building technology for subsalt imaging

Seismic imaging of hydrocarbon accumulations below salt is a formidable challenge because complexly shaped salt bodies severely distort wavefronts or.

Geological Structure, Geodynamic Evolution and Hydrocarbon Potential of NE Black Sea Region

October 6, 2008
TGS
Here we present the synthesis of available geological and geophysical data in order to discuss the presentday structure, geological history and.

Giant oil prospects lie in distal portion of offshore East Mediterranean Basin

October 1, 2008
James M. Peck
The onshore and offshore portions of the Eastern Mediterranean basin (Fig. 1) have proven to be a prolific hydrocarbon producing area. As of December.

Geological evolution and hydrocarbon potential of the Hatton Basin (UK sector), northeast Atlantic Ocean

August 14, 2008
David McInroy
During the Mesozoic and Early Cenozoic, and before sea floor spreading occurred in the North Atlantic Ocean, the North American and Eurasian continents.

An Evaluation of the Petroleum System Offshore Morondava Basin, Madagascar

June 4, 2008
TGS
This study addresses the regional interpretation of 2D seismic surveys across the offshore regions of Western Madagascar (Morondava Basin). It describes.

Discoveries lead to prospecting

June 1, 2008
Roger Welch
When the Kosmos/Tullow/ Anadarko group made the Mahogany and Hyedua discoveries offshore Ghana last summer, the transform margin that stretches from Benin.

The Russian Chukchi Sea

May 1, 2008
V. Verzhbitsky, E. Frantzen, T. Savostina, A. Little, S. D. Sokolov, M. I. Tuchkova
In 2006, TGS-NOPEC Geophysical Company acquired 3600km of multi-client 2D seismic in the Russian Chukchi Sea in cooperation with Geophysical Solutions.

New Seismic Data on the South and North Chukchi Sedimentary Basins and the Wrangel Arch and their significance for the Geology of Chukchi Sea Shelf

April 7, 2008
TGS
During the summer of 2006 TGS-NOPEC conjointly with Geophysical Solutions Integrator acquired new seismic data in the Russian part of the Chukchi Sea. The.

Why anisotropy can no longer be ignored

April 1, 2008
Andrew McBarnet
From time to time it is salutary to be reminded of the complexity of the issues routinely facing oil industry geoscientists in their efforts to unlock the.

TGS-NOPEC launches first secure client operations portal

February 1, 2008
TGS
TGS-NOPEC Geophysical Co. (TGS) has begun activating the first of a series of new secure Internet portals where clients will be able to easily access.

Progress in imaging through Basalt on the North West Frontier

January 10, 2008
TGS
We describe a recently acquired multi-client survey over part of Hatton Bank and Basin some 750km west of Scotland. Figure 1 shows the location of the new.

Technique improves deep shelf images

November 1, 2007
August Lau, Laurie Geiger and Duryodhan Epili
Repeat imaging using grid tomography and new well information was used in two subsalt fields in the Gulf of Mexico to resolve complex imaging challenges..

Oil and gas resources of Northeast Greenland

October 1, 2007
Donald L. Gautier
The new assessment carried out by USGS indicates that northeastern Greenland may be a very important future petroleum province. If the mean estimate of 31.

Indonesia object of massive study

October 1, 2007
I.R.R. Pryono and Paul Gilleran
Barely 6 months into an 18-monthlong exploratory program that eventually will cover more than 193,000 sq miles (500,000 sq km) of unmapped acreage in.

Differential OBC processing techniques

September 14, 2007
TGS
tags icon SEG
Compared to surface seismic, the increased complexity associated with seafloor seismic data (OBC) requires considerable attention to details if a.

Repeat imaging using grid tomography and new well information: application to two sub-salt fields in the Gulf of Mexico

September 12, 2007
TGS
tags icon SEG
The goal of repeat imaging (detailed studies of prospects as new information is available) using PSDM is to generate new locations for both development.

Fast velocity model building using kinematic demigration and migration

September 8, 2007
TGS
tags icon SEG
3-D prestack depth migration is the most time consuming part in velocity model building. To minimize the required iteration of depth migration, we first.

Advances in subsurface imaging technology boost the search for elusive hydrocarbons

September 1, 2007
Frank Dumanoir, Bin Wang and Simon Baldock
The remarkable improvements in data quality due to rapid advances in processing algorithms and computer technology over the past several years have been.

Deep imaging find new plays

May 1, 2007
Jørn B. Christiansen,
There was little industry interest in 2002 and 2003 when TGS launched the idea of aquiring a new generation of regional, long offset, long recording 2D.

Regional geology of deepwater salt architecture: New plays in GOM

May 1, 2007
Abu Chowdhury and Laura Borton
In deepwater Gulf of Mexico, the new Lower Tertiary play shows great promise - as much as 15 billion bbl of potentially recoverable reserves, according to.

From Russia with love

May 1, 2007
Erling Frantzen
Interest is growing in the prospectivity of the Chukchi Sea in the Russian Arctic as new evidence emerges to support the thesis that the under-explored.

Imaging deep into The Gulf of Mexico

January 1, 2007
Thomas Smith,
It is no secret that it is becoming more and more of a challenge to meet the expected production increases in the Gulf of Mexico. With its incredible.

Offshore West Greenland - frontier exploration!

November 1, 2006
GEO ExPro
In 2005 the Bureau of Minerals and Petroleum in cooperation with Nunaoil A/S and TGS-NOPEC acquired more than 3,200 km of new 2D seismic data offshore.

Proving up petroleum prospectivity Offshore Greenland

April 1, 2006
Jens Christian Olsen
Until recently, interest in the petroleum prospectivity offshore West Greenland has been sporadic at best. No surprise then, that exploration off the.

Rock and roll and all that...seismic!

January 1, 2006
Jane Whaley
T GS always had, and still has, a very different philosophy from most seismic companies, with a distinct business model," Hank explains. "In effect, TGS.

Regional deep water salt geology, offshore Nova Scotia, Canada

September 14, 2005
TGS
A pre-stack depth migration project has been undertaken to better image the deep water salt and associated geology of offshore Nova Scotia, Canada. A.

Getting from here to there: Utilizing modern web services allows end-users access to more oil and gas data

August 1, 2005
David Hicks, Chief Technology Officer, TGS-Nopec Geophysical Co. LP
The promise of easy access to multiple quality sources of oil and gas data, regardless of location, remains an elusive goal for interpreters, data.

Bottom-up analysis identifies Eastern Mediterranean prospects

June 1, 2005
James M. Peck
An existing TGS-Nopec regional 2D seismic survey over offshore the eastern Mediterranean and the recently acquired 2D lines over offshore Egypt reveal a.

Multi-client seismic frontier areas, English

March 1, 2005
TGS
Dalmorneftegeophizica (DMNG), a Russian seismic company based in Yuzhno-Sakhalinsk, and TGS-NOPEC Geophysical Company (TGS), a Norwegian/American company.

Multi-client seismic frontier areas, Russian

March 1, 2005
O&G
Дальморнефтегеофизика (ДМНГ), Российская сейсморазведочная компания, находящаяся в Южно-Сахалинске, и геофизическая компания TGS-NOPEC (TGS),.

More giants to be found

February 1, 2005
GEO ExPro
Two fields are currently being developed, significant amounts of oil and gas have already been found, and geological studies indicate that this is a.

Optmizing performance: Object storage for seismic applications

December 1, 2004
TGS
Political instability at many points of the world ... rising gasoline prices ... limited natural gas and oil reserves. These are just a few of the.

Kirchhoff or wave equation?

October 26, 2003
BP
tags icon SEG
Wave equation (or wave field extrapolation) techniques have been used in industry for the past few years, with the purpose to improve the accuracy of 3D.