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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract

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Chapter from:
AAPG Memoir 67: Seals, Traps, and the Petroleum System, Edited by R. C. Surdam
(Publication Subject: Oil Methodology, Concepts)
AAPG Memoir 67: Seals, Traps, and the Petroleum System. Chapter 11: Reservoir Characterization of Cretaceous Mardin Group Carbonates in Bölükyayla-Cukurtas and Karakus Oil Fields, SE Turkey: A Petrographic and Petrophysical Comparison of Previous HitOverthrustNext Hit and Foreland Zones, by Kadir Uygur, Huseyin Is, and M. Arif Yükler, Pages 168-198

Copyright © 1997 by The American Association of Petroleum Geologists. All rights reserved.

Chapter 11

Reservoir Characterization of Cretaceous Mardin Group Carbonates in Bölükyayla-Cukurtas and Karakus Oil Fields, SE Turkey: A Petrographic and Petrophysical Comparison of Previous HitOverthrustNext Hit and Foreland Zones

Kadir Uygur
Huseyin Is

TPAO Exploration Group Ankara, Turkey

M. Arif Yükler

IBA Inc. Dallas, Texas, U.S.A.

ABSTRACT

Approximately 95% of Turkey's total oil production comes from southeast Turkey, with 70% of the 95% from Cretaceous Mardin Group carbonates. This study is carried out to evaluate the petrophysical and petrographic properties of the source-reservoir-seal carbonate intervals of the Mardin Group oil fields of the foreland area and oil fields of the Upper Cretaceous Previous HitoverthrustNext Hit frontal zone of southeast Anatolia. The data include thin sections, cores and plugs, drill-stem tests, electrical logs, organic geochemistry, and basin analyses results from 65 exploration wells in both regions.

The Aptian-Lower Campanian Mardin Group is deposited on the shelf-to-intrashelf part of a passive continental margin of the Arabian plate. Relative sea level changes in the Cretaceous are responsible for three main shallowing-upward cycles that produced three reservoir intervals separated from each other by source and/or seal intervals. Each of the cycles is underlain and overlain by unconformity surfaces.

Structurally, the oil fields of the Previous HitoverthrustTop frontal zone and the foreland area studied are represented by the Cretaceous imbricated structures and the Miocene wrench system, respectively. Large accumulations of hydrocarbons have been trapped along both the east-west elongated, narrow, and asymmetrical thrusted anticlines of the imbricated zone and the northeast-southwest-trending en echelon anticlines of the wrench system.

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