Geochemical prerequisites for the formation of oil and gas accumulation zones in the South Turgay basin, Kazakhstan

Madisheva R.K. Portnov V.S. Amangeldiyeva G.B. Demeuova A.B. Seitkhaziyev Y.S. Azhgaliev D.K.
June 2024 Science Press

Acta Geochimica
2024 #43 Issue 3 520 - 534 pp.

This study predicts favorable oil and gas source-rock formation conditions in the Aryskum Depression of the South Turgay Basin, Kazakhstan. This study assesses the thermal maturity and characteristics of organic matter by determining its environmental conditions using data from geochemical analysis of core (pyrolysis) and oil (biomarkers and carbon isotopic compositions) samples. According to the geochemical parameters obtained by pyrolysis, the oil generation potential of the original rocks of most studied samples varies from poor to rich. The facies–genetic organic matter is predominantly humic and less frequently humus–sapropel, indicating organic matter accumulation in the studied samples were under moderately reducing conditions (kerogen III and II types) and coastal–marine environments (kerogen type I). The carbon isotopic compositions of oils derived from the Jurassic deposits of the Aryskum Depression also indicate the sapropelic and mixed humic–sapropelic type of organic matter (kerogen II and I). Biomarker analysis of oils indicates original organic matter formation in an anoxic environment.

Kerogen , Oil and gas potential , Organic matter , Source rock , South Turgay Basin

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Department Geology and Exploration of Mineral Deposits, Abylkas Saginov Karaganda Technical University NPJSC, Karaganda, Kazakhstan
Laboratory of Geochemical Studies of Oil, Water and Rock, Atyrau, Kazakhstan
Geological and Mineralogical Sciences, Atyrau University of Oil and Gas Named After Safi Utebayev, Atyrau, Kazakhstan

Department Geology and Exploration of Mineral Deposits
Laboratory of Geochemical Studies of Oil
Geological and Mineralogical Sciences

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