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Stratigraphy, Lithofacies, and Reservoir Distribution, Tengiz Field, Kazakhstan

By
L. James Weber
L. James Weber
ExxonMobil Exploration Company, 233 Benmar, GP3-641, Houston, Texas 77060, U.S.A., e-mail: jim.weber@exxonmobil.com
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Brent P. Francis
Brent P. Francis
ExxonMobil Development Company, 12450 Greenspoint Dr., GP6-552, Houston, Texas 77060, U.S.A., e-mail: brent.francis@exxonmobil.com
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P.M. (Mitch) Harris
P.M. (Mitch) Harris
Chevrontexaco E & P Technology Company, 6001 Bollinger Canyon Road, D-1212, San Ramon, California 94583-2324, U.S.A., e-mail: hapm@chevrontexaco.com
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Michael Clark
Michael Clark
Tengizchevroil, TCO Village, Kazakhstan Present address: ChevronTexaco, 6001 Bollinger Canyon Road, San Ramon, California 94583-2324, U.S.A., e-mail: micl@chevrontexaco.com
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Published:
January 01, 2003

Abstract

A supersequence-scale stratigraphic framework is developed for the super-giant Tengiz field of western Kazakhstan through the integrated interpretation of seismic, core, log, and biostratigraphic data. Tengiz produces oilfrom an isolated carbonate platform (areal extent of 580 km2) of Devonian and Carboniferous age. An initial broad Late Devonian platform exhibits vertical growth and was followed by punctuated backsteps during theEarly Carboniferous (Tournaisian and Viséan). The uppermost lower Carboniferous (Serpukhovian) is characterized by several kilometers of platform progradation seaward of the late Viséan platform break. The basal upper Carboniferous (Bashkirian) platform succession was aggradational. Drowning in theearly Bashkirian haltedcarbonate platform growth. Paleotopographic relief on the top of the Bashkirian platformto the basin floor approaches 1,500 meters within several kilometers lateral distance.

The stratigraphic architecture defined in this study is used to subdivide the reservoir. The reservoir is also partitioned on the basis of geographic position along a platform-to-basin profile. Time-slice mapping of synchronous depositional facies provides the basis for predicting reservoir distribution and continuity. On the platform, hydrocarbons are produced from Upper Viséan, Serpukhovian, and Bashkirian reservoirs in grainstone and mud-lean packstone lithofacies of the shallow platform and in packstone lithofacies of the deeper platform. Multiple pore types are recognized in Tengiz, but matrix permeability is controlled mainly by intergranular porosity. In-place, upper-slope microbial boundstone and transported lower-slope boundstone debris forms thick and areally extensive mappable reservoirs (Upper Viséan and Serpukhovian) that have distinctive seismic facies and production characteristics. Fractures contribute to non-matrix permeability in these boundstones.

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SEPM Special Publication

Permo-Carboniferous Carbonate Platforms and Reefs

Wayne M. Ahr
Wayne M. Ahr
Department of Geology and Geophysics, Texas A&M University, College Station, Texas 77843-3115, U.S.A.
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Paul M. (Mitch) Harris
Paul M. (Mitch) Harris
ChevronTexaco E&P Technology Company, 6001 Bollinger Canyon Road, San Ramon, California 94583-0746, U.S.A.
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William A. Morgan
William A. Morgan
ConocoPhillips, Inc., P.O. Box 2197, Houston, Texas 77252-2197, U.S.A.
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Ian D. Somerville
Ian D. Somerville
Department of Geology, University College - Dublin, Belfield, Dublin 4, Ireland
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SEPM Society for Sedimentary Geology
Volume
78
ISBN electronic:
9781565763340
Publication date:
January 01, 2003

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