This article expands on a pilot study by Ronghe and Trung (2000) which used impedance to delineate the extent of hydrocarbon occurrence in two sheet sand reservoirs.

The field, 45 km offshore Brunei Darussalam (Figure 1) in the Baram Delta province, is Neogene age. The stratigraphic succession is a northward-prograding sequence deposited in a series of cycles separated by marine transgressive phases (James, 1984; Sandal, 1996). Sand deposition is generally sheet-like and has been interpreted to be shoreface or delta-front related. The structural development of the offshore Baram Delta province was influenced by syn-sedimentary tectonics related to rapid...

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