Abstract
Woodbine-Eagle Ford reservoirs are productive over an area of about 55 mi2 (140 km2) in Kurten field. The Woodbine C sandstone is the most extensive reservoir and has an average net thickness of 30 ft (9 m). The C sandstone shows distinctive changes in rock type from south to north: (1) a cross-bedded facies consists of thin-bedded, medium-grained End_Page 1417------------------------------ (0.28-mm) quartzose sandstones; (2) a rippled facies is thinly interbedded shale and fine-grained (0.17-mm) sandstone; and (3) a bioturbated facies is highly churned, very fine-grained (0.12-mm) sandstone. These facies result in permeabilities decreasing from an average 47 md in the south to 0.1 md in the north. The C sandstone was deposited in a middle to outer shelf location, and sands were supplied by storm-driven or tidal currents from the Harris delta to the east. The south limit of the reservoir is controlled by a deep northeast-trending salt dome or ridge, called Hill dome. The upper Woodbine-Eagle Ford section was truncated by erosion along this trend and unconformably overlain by carbonate muds of the Austin Chalk. Sandstone facies suggest that salt uplift during deposition created a high on the sea floor, which was scoured by currents. Successively finer grained sands were deposited to the north under conditions of decreasing current flow and increasing water depths. End_of_Article - Last_Page 1418------------
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