Researches in Earth Sciences

Researches in Earth Sciences

Microfacies, sedimentary environment and diagenesis of the Asmari Formation in Chahar Bisheh Oil Field, south west of Iran

Document Type : علمی -پژوهشی

Authors
Asiyeh Yousefi Hajivand 1
Mohammad Hoseyn Adabi 2
Abbas Sadeghi 2
1 M.Sc in Sedimentology, School of Earth Sciences, Shahid Beheshti University
2 Professor, School of Earth Sciences, Shahid Beheshti University
10.29252/esrj.9.4.86
Abstract
In this research, two subsurface  sections consist of well No.2 and No.3 from the Asmari Formation with a thickness of 423 and 412 m respectively in Chahar Bisheh oil Field have been studied. The Asmari Formation in this field consists of intermittent layers of limestone and dolomite, very thin shale layers and anhydrite interlayers. Based on petrographic studies and identification of microfacies, 15 microfacies and 1 lithofacies in 4 facies belts consist of tidal flats, lagoon, shoal and open marine for the Asmari Formation have been recognized and sedimentary environment of this formation, is a Homocline ramp carbonate platform. Effective diagenetic processes including cementation, dolomitization, compaction, fracturing, dissolution, micritization, pyritization, geopetal fabric, boring, silicification and neomorphism which has influenced the Asmari Formation by all three marine, meteoric and burial diagenetic environments.
Keywords
Diagenesis
Asmari Formation
Sedimentary environment
Microfacies
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