Thermal maturity of organic matter and type of kerogen of Mesozoic sediments, Aryskum depression

R.K. Madisheva; S.M. Ozdoev; A.B. Demeuova; G.B. Amangeldiyeva; E.Sh. Seithaziev

doi:10.31643/2024/6445.29

Authors

R.K. Madisheva Abylkas Saginov Karaganda Technical University
S.M. Ozdoev Satbayev University
A.B. Demeuova Abylkas Saginov Karaganda Technical University
G.B. Amangeldiyeva Abylkas Saginov Karaganda Technical University
E.Sh. Seithaziev KazMunayGas National Company

DOI:

https://doi.org/10.31643/2024/6445.29

Keywords:

Aryskum depression, South Turgay oil and gas basin, oil and gas content, organic matter, hydrocarbons, type of kerogen

Abstract

This work is devoted to the study of the oil and gas source potential of the Mesozoic deposits of the Aryskum depression of the South Turgay oil and gas basin and aims to study the features of the geological structure, determine the facial-genetic type and degree of maturity of organic matter. Geochemical methods play an important role in assessing oil and gas source potential, one of which is pyrolytic core analysis to determine the type of organic matter and thermal maturity of the studied rock material samples. To achieve this goal, the results of pyrolytic analysis of stone material from Neocomian and Jurassic deposits were used. Analysis of geological and geophysical materials made it possible to trace the pattern of distribution over the area of oil and gas-bearing sandy layers and the underlying clay layers with high insulating properties in the Aryskum horizon. The results obtained show that the total organic carbon content ranges from 0.47 to 1.41 wt%. To establish the type of kerogen and its position relative to the zones of oil and gas formation, the Van Krevelen diagram was used in the coordinates of atomic ratios of the elemental composition of kerogen and its modification for pyrolytic data, indicating that the kerogen of the studied samples is a mixture of types I, II and III, facies-genetic the type of organic matter of which belongs to humic, humic-sapropelic, and the sedimentation conditions are coastal-marine environment in moderately reducing conditions.

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Author Biographies

R.K. Madisheva, Abylkas Saginov Karaganda Technical University

Doctor PhD, Acting Associate Professor of the Department of Geology and Exploration of Mineral Deposits of Karaganda Technical University named after Abylkas Saginov, Republic of Kazakhstan, 100000, Karaganda, Nursultan Nazarbayev Avenue, 56.

S.M. Ozdoev, Satbayev University

Doctor of Geological and Mineralogical Sciences, Academician of the National Academy of Sciences of the Republic of Kazakhstan, Deputy Director of the Institute of Geological Sciences named after K. I. Satpayev, Republic of Kazakhstan, 050010, Almaty, Kabanbai Batyr str., ug. Valikhanov str., 69/94.

A.B. Demeuova, Abylkas Saginov Karaganda Technical University

Doctoral student of the Department of Geology and Exploration of Mineral Deposits of Karaganda Technical University named after Abylkas Saginov, Master of Engineering and Technology, Republic of Kazakhstan, 100000, Karaganda, Nursultan Nazarbayev Avenue, 56.

G.B. Amangeldiyeva, Abylkas Saginov Karaganda Technical University

Doctoral student of the Department of Geology and Exploration of Mineral Deposits of Karaganda Technical University named after Abylkas Saginov, Master of Technical Sciences Republic of Kazakhstan, 100000, Karaganda, Nursultan Nazarbayev Avenue, 56.

E.Sh. Seithaziev, KazMunayGas National Company

PhD Candidate (SOCAR), Master of Science in Oil and Gas Geochemistry, Head of the Laboratory of Geochemical Studies of Oil, Water and Rocks, Atyrau, Republic of Kazakhstan.

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