Declaration Refocus

The Declaration Refocus Program is the next generation M-WAZ imaging program in Mississippi Canyon in the U.S. Gulf of Mexico. The new, high-end re-imaging workflow is designed to provide enhanced imaging and greater illumination of prospectivity in the area. TGS is applying a combination of technologies including Dynamic Matching FWI to improve the velocity and salt model, and increase the frequency content in data. This reprocessing has strong support from many exploration and production companies and is targeting the Mesozoic level, including the highly prolific Norphlet play, as well as shallower horizons. The program comprises data covering more than 380 Outer Continental Shelf (OCS) blocks (~8,860 square kilometers) from orthogonal 3D WAZ programs acquired by TGS, between 2010 and 2015, using WesternGeco Q-Marine and CGG StagSeis seismic systems.  Final data is now available.

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Declaration Refocus TGS

Dynamic Matching FWI

Declaration Refocus is the first streamer reprocessing 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.


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DM FWI Applied
DM FWI Applied
Before DM FWI
Before DM FWI

Declaration Refocus FWI before and after application of Dynamic-Matching FWI

The starting model ("before"), in the image above, shows legacy dual WAZ dataset (Declaration M-WAZ). The end model ("after") shows the final DM FWI derived Declaration Refocus model and image. Improved velocity model improves the imaging of salt and salt-related structures.

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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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