Seismic indicates large structures off Bahamas

By OGJ editors
HOUSTON, Feb. 22
-- Preliminary onboard processing of 2D seismic in southern Bahamas waters shows numerous structures with four-way dip closure much larger than previously expected, said Bahamas Petroleum Company PLC.

Independent consulting geological analyses of the January 2011 2D seismic preliminary mapping results and June 2010 fully processed prestack time migration data provide evidence of giant-size structures capable of holding several hundred million barrels of oil on its southern licenses, the company said. Detailed processing will take 2 months.

The presence of a potential Middle Jurassic salt layer may point to a further subsalt play in the area, Bahamas Petroleum said.

The company is considering a 3D seismic survey, and several vessels are available.

The company posted the consulting studies on its website. It said they provide the first structure maps that document the size and extent of closure of the features, based on 1,120 km of seismic data, and demonstrate the consistency of fold formation, the continuity of folds along the structural trend, the ability to seismically map internal continuity of reservoir-seal strata across the folds, and the geometric form of the folds.

The extent and style of structural geometry of the large-scale folds was not possible from historical seismic data, said Dr. Paul Crevello, chief executive officer of Bahamas Petroleum.

Nonexecutive chairman Alan Burns said, "These structures are exceptional in the size and extent of the four-way closure, indeed I am not aware of any anticlines of this size in the Gulf of Mexico-Caribbean region.”

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