TGS and Schlumberger have begun the Dual Coil Shooting multivessel full-azimuth acquisition Revolution XII and XIII surveys in the U.S. Gulf of Mexico (GoM), according to a news release.

Covering about 7,150 sq km, or 306 blocks, the surveys will cover the Green Canyon, Atwater Valley and Ewing Bank protraction areas.

In the release, Schlumberger said the surveys will be acquired using its 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. By using this technology and technique, the companies aim to improve illumination and imaging of the sub-salt and other complex geologic features.

Acquisition is expected to complete in first-quarter 2017. Final processed data should be available in early 2018.