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Oil-source rock correlation in super-giant Gachsaran oilfield

Document Type : Original Research Paper

Authors

1 Ms. C., School of Geology, College of Science, University of Tehran, Tehran, Iran

2 Professor, School of Geology, College of Science, University of Tehran, Tehran, Iran

3 Professor, Australian School of Mines, Minerals, Energy and Chemical Engineering, Curtin University, Australia

4 Ph. D. Student, Geochemistry research group, Faculty of Geoscience, Research Institute of Petroleum Industry, Tehran, Iran

Abstract

Geochemical investigation of Kazhdumi and Pabdeh formations suggest a shaly and carbonate lithology as well as a suboxic-anoxic marine depositional environment for both formations. On the other hand, the thermal maturity of the Kazhdumi Formation is equivalent to the mid of oil window while thermal maturity-related parameters show that the Pabdeh Formation has not entered the oil window. Biomarkers are indicative of derivation of the four oil samples from a carbonate-shaly or marly source rock. Also, thermal maturity-related biomarkers reflect a peak mature stage for all of the four samples. Different values of oleanane index in oil samples is implying a more significant role of the Pabdeh Formation in hydrocarbon embedded in 36, 56, 55 wells in compare to well number 22. In general, oil-source correlation introduces both Kazhdumi and Pabdeh formations as source rocks for the crude oils.

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References
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Scientific Quarterly Journal of Geosciences
Volume 30, Issue 118 - Serial Number 118
Vo. 30, No, 118, Winter 2021
January 2021
Pages 71-80
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