TITLE:
Microfacies Patterns and Depositional Environments of the Sarvak Formation in the Abadan Plain, Southwest of Zagros, Iran
AUTHORS:
Shahab Soleimani Asl, Mohsen Aleali
KEYWORDS:
Microfacies, Depositional Environments, Sarvak Formation, Zagros, Iran
JOURNAL NAME:
Open Journal of Geology,
Vol.6 No.3,
March
30,
2016
ABSTRACT: The Sarvak Formation is
the second major oil-bearing reservoir in the south and south west of Iran. The
Middle Cretaceous Sarvak formation in the Zagros Mountains (Zagros Basin) is
mainly composed of carbonate sequences. Based on facies studied, thirteen
microfacies were recognized in the studied area, which were categorized in the
three facies groups: including inner ramp, mid ramp and outer ramp. Evidences
such as the gradual changes in the facies (basin slope), the absence of
extensive uninterrupted barrier reef, the lack of calciturbidite and gravity
sediments as well as the high proportion of grain-supported indicated that the
Sarvak Formation was deposited in the ramp like depositional system,
particularly on an inner ramp setting. Inner ramp facies group is the principal
setting and subdivided to tidal flat, restricted and unrestricted lagoon as
well as shoal sub-environments.