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Amendment Phase 1

The Amendment Phase 1 FWI node survey is the largest multi-client deepwater node survey ever delivered in the U.S. Gulf of Mexico (GoM). The survey was optimized to acquire a minimum of 40 kilometer ultra-long offsets - another industry first for an area of this size. Amendment Phase 1 was acquired in water depths of up to 2,070 meters and covers 118 OCS blocks (2,765 square kilometers). Final data is now available.

The next phase, "Engagement," will extend the footprint of ultra-long data in the Northern Green Canyon protraction area.


The next generation of exploration data is here!

OBN data provides very low noise data but also allows many more survey design options. As the source vessels move independently to the nodes, which remain stationary on the seabed, azimuth and offset can be selected optimally for survey objectives. As FWI algorithms need long offset refraction information a new survey design was created and optimized for Amendment.

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Got it
Amendment Phase 1 after application of Dynamic Matching FWI
DM FWI Applied
Amendment Phase 1 before application of Dynamic Matching FWI
Before DM FWI

Amendment Phase 1 FWI before and after application of Dynamic-Matching FWI

In the images above, the starting model shows velocity model from legacy dual WAZ dataset (Fusion M-WAZ). The second model shows the fast track FWI derived update. The improved velocity model highlights salt feeders and stock, steeply dipping beds and a more continuous Louann level base of salt.

Dynamic Matching FWI

Amendment is the first project to utilize Dynamic Matching Full-Waveform Inversion (DM-FWI) from TGS for a high-resolution velocity-model update, which focuses on solving kinematic difference between input data and synthetic data. With the data residual calculated in localized windows in time and space, DM-FWI provides a robust velocity-model update using the total energy in the data including both diving wave and reflections. The application to Amendment sparse node dataset with ultralong offsets in Gulf of Mexico shows its capability to resolve large velocity errors and give significant uplift on sub-salt image.

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Got it
Amendment Phase 1 after application of Dynamic Matching FWI
DM FWI Applied
Amendment Phase 1 before application of Dynamic Matching FWI
Before DM FWI

Amendment Phase 1 FWI before and after application of Dynamic-Matching FWI

The starting model ("before"), in the image above, shows legacy dual WAZ dataset (Fusion M-WAZ). The end model ("after") shows the fast track DM FWI derived update and imaging enhancement from long offset, low noise OBN data. Improved velocity model improves the imaging sub salt.

Move the Slider Left or Right
to Visualize the Images

Got it
Amendment Phase 1 after application of Dynamic Matching FWI
DM FWI Applied
Amendment Phase 1 before application of Dynamic Matching FWI
Before DM FWI

Amendment Phase 1 FWI before and after application of Dynamic-Matching FWI

In the images above, the "before" model shows velocity model from legacy dual WAZ dataset (Fusion M-WAZ). The "after" model, shows the fast track FWI derived update. Improved velocity model highlights: salt feeders and stock, steeply dipping beds and a more continuous Louann level base of salt.

Amendment Phase 1 was acquired in partnership with WesternGeco and processed by TGS.

 

 

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Dynamic Matching Full Waveform Inversion

Senior Researcher Jian Mao presents the advanced Dynamic Matching Full Waveform Inversion (DM FWI) algorithm and its applications on field datasets

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Lease Sale 257

The U.S. Department of the Interior’s Land and Mineral Management and Bureau of Ocean Energy Management (BOEM) has announced an oil and gas lease sale for the Gulf of Mexico (GoM) on November 17, 2021, in compliance with an order from a U.S. District Court. Lease Sale 257 will include 15,135 unleased blocks located from 3 to 231 miles offshore in the Gulf of Mexico with water depths ranging from 9 to more than 11,115 feet. 

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