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Book Chapter

Geological Controls on Pore Geometry of Upper Kharaib Reservoir, Offshore Abu Dhabi, U.A.E.

By
Jun-Ichi Saotome
Jun-Ichi Saotome
Bunduq Oil Company Ltd., P. O. Box 46015, Abu Dhabi, United Arab Emirates Present address: Japan Oil Development Company Ltd., 1–7, Uchisaiwai-cho 1 Chome, Chiyoda-ku, Tokyo 100–0011, Japan.
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;
Toshiaki Shibasaki
Toshiaki Shibasaki
Zakum Oil Development Company, P. O. Box 46808, Abu Dhabi, United Arab Emirates.
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;
Tsuyoshi Shikama
Tsuyoshi Shikama
Japan Oil Development Company Ltd., 1–7, Uchisaiwai-cho 1 Chome, Chiyoda-ku, Tokyo 100–0011, Japan.
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;
Ken-Ichi Kawaguchi
Ken-Ichi Kawaguchi
Japan Oil Development Company Ltd., Abu Dhabi Branch, P. O. Box 2659, Abu Dhabi, United Arab Emirates.
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Published:
January 01, 2000

Abstract

The upper Kharaib reservoir of the Lower Cretaceous Thamama Group is one of the major oil-producing horizons offshore Abu Dhabi in the United Arab Emirates, and is traced over the area as a well-defined rock unit. This reservoir is composed of three lithofacies, rudistid-peloidal grainstone/packstone, algal-peloidal grainstone/packstone, and bioclastic wackestone/mudstone. Sediments were deposited on a broad carbonate shelf and show an upward-shallowing succession. Reservoir quality is determined by both original depositional fabric and subsequent diagenetic processes. In general, permeability is variable and porosity is constant throughout the sequence, except for stylolitized intervals.

In the “A” field, six high-permeability facies are identified in the grain-supported interval. These facies are characterized by unique pore-throat size distributions resulting from depositional textures and diagenetic modification. Grain sorting and preferential dissolution, as well as preservation of primary pores, are significant factors in controlling pore geometry. Dolomitization is also locally important. The highest permeability is present in well-sorted, coarse-sized grainstone at the basal part of upward-fining bed sets where well connected intergranular pores are preserved.

Thus, identification of high-permeability facies is crucial if one is to understand the performance of the reservoir under water flood. On the basis of the vertical and lateral distribution of high-permeability facies and pore-throat size distribution, the reservoir was divided into twenty-two sublayers as a basis for reservoir simulation study.

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SEPM Special Publication

Middle East Models of Jurassic/Cretaceous Carbonate Systems

Abdulrahman S. Alsharhan
Abdulrahman S. Alsharhan
Faculty of Science United Arab Emirates University, P.O. Box 17551, Al Ain, U.A.E.
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;
Robert W. Scott
Robert W. Scott
Precision Stratigraphy Associates, RR3 Box 103-3, Cleveland, OK 74020, U.S.A.
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SEPM Society for Sedimentary Geology
Volume
69
ISBN electronic:
9781565761919
Publication date:
January 01, 2000

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