Geochemical Characteristics of Crude Oil and Oil–Source Correlations in the Yongfeng Sub-Sag of the Bogda Mountain Front Belt

Xiangcan Sun, Jianwei Wu, Xingui Zhou, Yongjin Gao, Youxing Yang, Zhongkai Bai, Kun Yuan, Lei Wen () and Yi Chen ()
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Xiangcan Sun: Oil & Gas Survey, China Geological Survey, Beijing 100083, China
Jianwei Wu: Oil & Gas Survey, China Geological Survey, Beijing 100083, China
Xingui Zhou: Oil & Gas Survey, China Geological Survey, Beijing 100083, China
Yongjin Gao: Oil & Gas Survey, China Geological Survey, Beijing 100083, China
Youxing Yang: Oil & Gas Survey, China Geological Survey, Beijing 100083, China
Zhongkai Bai: Oil & Gas Survey, China Geological Survey, Beijing 100083, China
Kun Yuan: Oil & Gas Survey, China Geological Survey, Beijing 100083, China
Lei Wen: Oil & Gas Survey, China Geological Survey, Beijing 100083, China
Yi Chen: Oil & Gas Survey, China Geological Survey, Beijing 100083, China

Energies, 2025, vol. 18, issue 4, 1-17

Abstract: The exploration level of the Bogda Mountain front belt is relatively low, and the research on hydrocarbon accumulation is limited, resulting in unclear sources of discovered oil. To further investigate the geochemical characteristics and sources of crude oil in the Bogda Mountain front belt, this study conducted geochemical experimental analysis and oil–source correlations on crude oil and hydrocarbon source rock samples from the Permian Lucaogou Formation in the Yongfeng sub-sag and surrounding areas of the Bogda Mountain front belt. By using gas chromatography–mass spectrometry technology, the geochemical characteristics of saturated hydrocarbons and aromatic compounds were analyzed. Combined with stable carbon isotopes of saturated hydrocarbons and aromatic hydrocarbons, the organic matter source, maturity, and sedimentary environment were determined. The research results indicate that the crude oil from Well Xyd 1 exhibits mature characteristics, and the source material was deposited in a reducing to weakly oxidizing, weakly reducing environment. The source rocks of the Lucaogou Formation in Well Xyd 1 were formed in a reducing, semi-saline–saline sedimentary environment, while those from the Gjg and Dhs outcrops developed in a weakly oxidizing–weakly reducing, non-high-salinity, weakly stratified sedimentary environment. Carbon isotope, terpane, and isoalkane characteristics confirm a significant genetic relationship between the crude oil from Well Xyd 1 and the local Luzhaogou Formation source rocks. The source rocks of the Luzhaogou Formation in the Yongfeng sub-sag exhibit strong heterogeneity, with significant differences in sedimentary environments and parent materials in their spatial distribution. Maturity analysis indicates that the Luzhaogou Formation source rocks in Well Xyd 1 have reached a mature stage, whereas those from the Gjg and Dhs outcrops are at a relatively low maturity level.

Keywords: geochemical characteristics; oil–source correlations; Lucaogou Formation; Yongfeng sub-sag; Bogda Mountain front belt (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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