Identification and Evaluation of Turbidite and Other Deepwater Sands Using Open Hole Logs and Borehole Images
Steven M. Hansen, Tom Fett, 2000. "Identification and Evaluation of Turbidite and Other Deepwater Sands Using Open Hole Logs and Borehole Images", Fine-Grained Turbidite Systems, Arnold H. Bouma, Charles G. Stone
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Deepwater sandstone deposits have become important oil and gas reservoirs. The evaluation of these deposits using standard open hole logs can be difficult because many of these thinly bedded deposits are below the resolution of traditional open hole logs. Borehole images have become an established tool to identify and delineate these deposits. Micro-resistivity images, such as Formation MicroImager* (FMI), can resolve bed thickness down to 1 cm, and can suggest grain-size variations, flow characteristics, sand continuity, and permeability ranges. These images can help to determine structure, faults, unconformities, depositional environment, and sand-body orientations. This high-definition information about reservoir sands, combined with the structural and stratigraphic information, allows the best possible understanding of the reservoir in terms of depositional environment, reservoir quality, and probable productive units.
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This Memoir covers one of the most important and active exploration reservoirs being pursued by geoscientists worldwide: fine-grained turbidite systems. 28 chapters show the results of an intense research effort in the 1990s that resulted from the discovery of large hydrocarbon accumulations in fine-grained turbidite systems in Brazil, the Gulf of Mexico, West Africa, and the North Sea. Industry and academia have joined together in this publication and the result is a unique opportunity to study these turbidite systems from the outcrop to the modeling; through the interpretation with 2-D and 3-D seismic data; to case histories and analog studies from Arkansas and Oklahoma, South and West Africa, Gulf of Mexico, west Texas, and New Zealand.