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Geochemical prerequisites for the formation of oil and gas accumulation zones in the South Turgay basin,Kazakhstan
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作者 rima kopbosynkyzy madisheva Vassiliy Sergeevich Portnov +3 位作者 Gulmadina Bulatovna Amangeldiyeva Akmaral Bakhytbekovna Demeuova Yessimkhan Sherekhanovich Seitkhaziyev Dulat Kalimovich Azhgaliev 《Acta Geochimica》 EI CAS CSCD 2024年第3期520-534,共15页
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 ... 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(kerogenⅢand Ⅱ types)and coastal–marine environments(kerogen typeⅠ).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(kerogenⅡandⅠ).Biomarker analysis of oils indicates original organic matter formation in an anoxic environment. 展开更多
关键词 South Turgay Basin Oil and gas potential Source rock Organic matter KEROGEN
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