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.