Chronology of trap formation and migration of hydrocarbons in Zagros sector of southwest Iran
Sixty-three orogenically controlled oil and gas fields have been discovered in the Zagros sector of southwest Iran since teh turn of the present century. Most of the fields are giant, multi-reservoir accumulations producing from fractured carbonate pay zones ranging in age from permo-Triassic to Oligo-Miocene. The most prolific oil-producing zones are the Asmari formation (Oligo-Miocene( and the Bangestan Group (Upper Cretaceous). The available geochemical evidence indicates taht the major source of the oil is the underlying Lower Cretaceous (Albian) Kazhdumi Formation. It is argued that, in the main oil-producing area, the Kazhdumi source rock was not buried to the depth required for hydrocarbon generation until the Eocene, and that not significant oil explusion took place until the Miocene. entry of oil into the reservoirs is geologically a recent event; it postdates the late Miocene-Holocene Zagros orogeny that resulted in the formation of the present structural traps. It is suggested that the development of growth structures during the Late Cretaceous and Palogene could have contributed to some hydrocarbon localization prior to the formation of the late Tertiary traps.
- Research Organization:
- Imperial Coll. of Science and Tech., London, England
- OSTI ID:
- 6472258
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Vol. 66:10; ISSN AAPGB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
ASIA
CENOZOIC ERA
CRETACEOUS PERIOD
DEVELOPING COUNTRIES
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC TRAPS
IRAN
MESOZOIC ERA
MIDDLE EAST
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NATURAL GAS FIELDS
OIL FIELDS
ORIGIN
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCES
SOURCE ROCKS
TERTIARY PERIOD