Norway-based geoscience data firm TGS has extended its Declaration Multi-WAZ survey in the Mississippi Canyon and DeSoto Canyon protraction areas of the Gulf of Mexico.

The extension will see CGG acquire a minimum 2,000km² of further data utilising the single pass vessel configuration derived from its StagSeis technology.

TGS said the technology will better image deep structural elements and enhance subsalt, as well as salt flank illumination.

"Expanding the survey to cover the extent of the current Lower Tertiary Norphlet fairway will provide industry-leading data for current and future exploration and development objectives."

Early observations from the fast track migration of the Declaration project’s first phase played an important role in extension.

Acquisition of the extension is anticipated to be completed in the second quarter of 2015, followed by fast track deliverables and final imaging products in 2016.

TGS COO Kristian Johansen said: "Expanding the survey to cover the extent of the current Lower Tertiary Norphlet fairway will provide industry-leading data for current and future exploration and development objectives."

In September 2014, TGS unveiled the initial two ocean bottom seismic surveys to be undertaken in the US Gulf of Mexico under its collaboration agreement with FairfieldNodal.

The projects include the Calypso full azimuthal nodal (FAN) survey and the Nessie FAN survey.

TGS offers multi-client geoscience data to worldwide oil and gas exploration and production companies.