Depositional environment abd sequence stratigraphy of the Fahliyan Formation in Darquain Oil Field

Authors

1 Ph.D, Department of Earth Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Associate Professor, Department of Earth Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran

Abstract

The Fahliyan Formation located in Darquain oil field with low lithological diversity, is composed of limestone in the lower parts of the reservoir and dolomite-limestone in the upper parts. The Fahliyan Formation in the Darquain 33 well has overlain conformably the Garu Formation and overlaid by Gadvan Formation. In this research, Fahlian Formation in Darquain 33 well was studied lithologically in order to identify microfacies, sedimentary environment, and sequence stratigraphy. Lithological studies led to the identification of 12 microfacies as well as one lithofacies (shale) belong to 4 facies belts, including tidal flat, lagoon, shoal and open marine. The absence of barrier reefs (which are characteristic of rimmed shelves) and on the other hand the gradual conversion of microfacies to each other and the presence of vast areas of tidal flat as well as the absence of calciturbidite represent this sequence deposited on a carbonate ramp platform. Base on the microfacies, gama ray and sequence stratigraphy concepts, three 3rd sequence in Darquain 33 well was recognized. The investigation of sedimentary environment and sequence stratigraphy of the Fahliyan Formation could be useful in the reconstruction of paleogeography of the study area in Cretaceous time.

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History

  • Receive Date: 13 August 2023
  • Revise Date: 11 October 2023
  • Accept Date: 12 October 2023

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