Structural controls on source rock distribution and maturation in southeast Turkey
- ARCO Oil and Gas Co., Plano, TX (USA)
- ARCO Turkey, Inc., Ankara (Turkey)
Production from the western part of the Zagros fold and thrust belt southeastern Turkey is characterized by high-sulfur (2-3%) oils from middle Cretaceous Mardin Formation. The oils are generated from two carbonate sources, one from the middle Cretaceous passive margin sequence and one deposited as a part of the Upper Cretaceous foreland basin sequence. Both sources are associated with transgressive events coincident with two recognized Cretaceous oceanic anoxic events in Cenomanian-Turonian and Coniacian-Santonian. Geochemical markers in the oils substantiate the restricted, anoxic conditions characteristic of their source rock deposition. During the Upper Cretaceous compressional event, horsts formed buttresses to advancing oceanic thrust sheets. The oceanic thrust sheets consisted of the Karadut and Kocali formations, oceanic equivalents of the Mesozoic shelf. The middle and Upper Cretaceous source facies were rapidly and deeply buried by the tectonically thickened thrust sheets adjacent to the buttresses. Thick burial by the oceanic rocks was critical for thermal maturation of the sources. Geohistory modeling shows generation occurred during the Tertiary coincidental with tectonic activity that probably allowed oil migration to occur along new or reactivated Cretaceous faults.
- OSTI ID:
- 6682344
- Report Number(s):
- CONF-900605-; CODEN: AABUD
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (USA), Vol. 74:5; Conference: Annual convention and exposition of the American Association of Petroleum Geologists, San Francisco, CA (USA), 3-6 Jun 1990; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
Similar Records
Cretaceous source rock sedimentation and its relation to transgressive peaks and geodynamic events for the Central Tethys
Carbonate platform depositional sequences in an extensional-to-compressional continental margin, Upper Cretaceous, south-central Pyrenees, Spain
Related Subjects
58 GEOSCIENCES
OIL FIELDS
SOURCE ROCKS
MATURATION
TURKEY
CARBONATE ROCKS
CRETACEOUS PERIOD
GEOLOGIC FAULTS
GEOLOGIC FORMATIONS
SEDIMENTARY BASINS
TECTONICS
TERTIARY PERIOD
ASIA
CENOZOIC ERA
DEVELOPING COUNTRIES
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
MESOZOIC ERA
MIDDLE EAST
MINERAL RESOURCES
PETROLEUM DEPOSITS
RESOURCES
ROCKS
SEDIMENTARY ROCKS
020200* - Petroleum- Reserves
Geology
& Exploration
580000 - Geosciences