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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 Overthrust 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 Overthrust 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 overthrust 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 overthrust 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.
End page 11
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