The Location
Location
Côte d'Ivoire, Blocks 602 & 603
Survey Year
2015
Data Deliverables
Kirchhoff PSDM, Velocity Model
Survey Type
3D GeoStreamer
Configuration
10 streamers, 100 m separation
Survey Size
5 000 sq. km
The Challenge
The Solution
Data
3D GeoStreamer
Processing
Full 3D demultiple
Velocity Model Building
FWI and Q-VMB tomography
Migration
Q-Kirchhoff prestack depth
QI
Seismic driven inversion for relative impedance
An integrated visco-acoustic model building sequence, including FWI and Q-VMB, has been adopted to resolve the impact of complex Late Cretaceous and Paleocene channel systems on deeper targets. This approach eliminates the reflectivity imprint, creates an accurate velocity model, eliminates uncertainty in the image and improves the amplitude-fidelity of the dataset.
Attenuation Effects of Canyons Resolved
Implementation of fully integrated visco-acoustic model building and migration delivers the results on the right. The removal of the imprint of the canyon on the data below is shown on the log spectra ratio plots (inserts) from the Base Tertiary Unconformity horizon. The spectra on the right demonstrates how the amplitudes have been successfully compensated for below the canyons (blue is ideal).
The Results
Effective Model Building Improves Continuity of Impedance Data
Relative impedance quality control shows better continuity and resolution of events below the Maastrichtian and Paleocene channels. The interpretation and evaluation of prospective features at target level can be completed with more confidence.