Organic geochemical Evaluation of the Pabdeh Formation in the Siah-Makan Oilfield using Rock-Eval pyrolysis and organic petrographic methods

Authors

1 Department of Petroleum Geology and Sedimentary Basins, Faculty of Earth Sciences, Shahid Chamran University of Ahvaz, Iran

2 Department of Petroleum Geology and Sedimentary Basin, Faculty of Earth Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran

Abstract

In this study the hydrocarbon generation potential and depositional environments of the Pabdeh Formation in the Siah-Makan Oilfield is investigated. For this purpose, a total of 21 cutting samples were collected from well#4 of the studied oil field from the Pabdeh Formation and were analyzed by Rock-Eval 6 pyrolysis method to evaluate the hydrocarbon potential. The HI versus Tmax diagram indicates type II/III kerogen for the studied formation with thermal maturity corresponding to the early stages of the oil generation window. Microscopic observations of selected samples indicates that samples with higher TOC readings contain fossil chambers filled with bituminite. In addition, these samples are characterized by a light-colored carbonate matrix which was deposited under oxic conditions. These observations suggest that the Pabdeh Formation has negligible hydrocarbon potential in the Siah-Makan Oilfield and was deposited under oxic conditions. A Combination of Rock-Eval pyrolysis and organic petrographic methods can be useful for accurate geochemical evaluation of the Pabdeh Formation in future studies.

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References

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Advanced Applied Geology
Volume 13, Issue 3
October 2023
Pages 782-793

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