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Abstract

Sheet sands and sandstones are considered to be some of the best high-rate, high-ultimate recovery (HRHU) reservoirs in deepwater (Chapter 2). This is due to their tendency towards the simplest reservoir geometries: good lateral continuity, potentially good vertical connectivity, high aspect ratio, narrow range in grain size (and thus greater porosity and permeability: Chapter 13), and few erosional features. Because of their initial successes as reservoirs in the northern deep Gulf of Mexico, sheet sands and sandstones have been studied in great detail by industry to better understand them, and, hence, to find more of them. One problem, however, is that reservoirs initially interpreted as sheet sands were later determined to be amalgamated channel sands.

Sheet sands are deposited from decelerating flows at the terminus of channels. Sheet sands and sandstones reflect the sediments that have bypassed through updip channels (confined flow) and are deposited in primarily an unconfined setting. They are characterized by high aspect ratio reservoir sand bodies (>500:1), markedly different in aspect than the updip channels that feed them (30:1 to 300:1). Unlike other deepwater reservoir elements, the areal extent of sheet sands is commonly larger than the area of the trap. Sheet sands and sandstones are most prevalent in mixed mud-sand to mud dominated systems (Richards and Bowman, 1998). Sheet sands and sandstones are not as common in sand-rich to gravel-rich systems (Chapter 1 and Chapter 5).

Sheet sands and sandstones are characterized by their tabular

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