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The study investigates the composition of biomarker hydrocarbons in oils from different geological ages in the Middle Ob region.

Biomarker Hydrocarbons in the Oils From the Middle Ob Region ( West Siberia )

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The study investigates the composition of biomarker hydrocarbons in oils from different geological ages in the Middle Ob region.
Examined oil samples from Lower–Middle Jurassic and Upper Jurassic formations
Analyzed the impact of biodegradation on hydrocarbon composition
Compared biomarker parameters from different oil source rocks
Identified identical bitumoids in Bazhenovo oil source rock regardless of biodegradation
Detected anomalous hopane distribution and 25-norhopanes in Cenomanian oil due to biodegradation
Established Bazhenovo oil is significantly altered by high temperatures and pressures

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Analysis explores biomarker hydrocarbons in oil from productive horizons in West Siberia, indicating catagenetic transformations.

Kontorovich et al. (1991) studied this question.

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