​TGS, Schlumberger combine technologies to improve imaging of GoM sub-salt and other complex geologic features

Image: TGS

TGS and Schlumberger have commenced the Dual Coil Shooting multivessel full-azimuth acquisition Revolution XII and XIII surveys in the U.S. Gulf of Mexico. The surveys will cover approximately 7,150 square kilometres (306 blocks) in the Green Canyon, Atwater Valley and Ewing Bank protraction areas of the Central Gulf of Mexico.

The surveys will be acquired using the Schlumberger WesternGeco Q-Marine point-receiver marine seismic system combined with the proprietary multivessel, Dual Coil Shooting acquisition technique, which will provide broadband, long-offset, full-azimuth data.

The combination of leading-edge technology and technique will improve illumination and imaging of the sub-salt and other complex geologic features in this highly active region. Acquisition is expected to complete in late Q1 2017 with final processed data available in early 2018.

“The Revolution XII and XIII surveys benefit from the latest advances in seismic technology and will provide the E&P industry with critical information to support exploration and drilling activity in a region that is expected to remain a priority for our customers," commented Kristian Johansen, chief executive officer, TGS.

These new Revolution Dual Coil Shooting full-azimuth surveys will record offsets of more than 14 kilometres for imaging below the salt in the deepwater Gulf of Mexico.

In this latest generation of Revolution surveys, autonomous marine vehicles (AMV) are being deployed. These AMVs will simultaneously acquire ultra-long offsets of more than 20 kilometres, which benefit full waveform inversion in the accurate velocity model building over such complex subsalt areas.

"With these new techniques, we expect to see further improvements in sub-salt imaging and amplitude fidelity for reservoir characterization providing value for our customers," commented Maurice Nessim, president, WesternGeco.

The project is supported by industry funding.

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