| 准噶尔盆地玛湖凹陷艾湖油田原油地球化学特征与油源对比 |
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| 关键词:Mahu Sag Aihu oilfield source rock biomarker geochemistry oil‐source correlation |
| 基金项目:中国石油天然气股份有限公司应用性科技课题“陆相页岩油分类评价与规模增储研究”(编号: 2023ZZ15YJ01)；自治区天山英才-科技创新领军人才支持项目“北疆地区二叠系超级盆地全油气系统地质理论研究与战略接替领域优选”(编号: 2022TSYCLJ0070) |
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| 摘要: |
| Geochemical Characteristics and Oil-source Rock Correlation of Crude Oil in Aihu Oilfield, Junggar Basin |
| Mahu Sag, located in the Junggar Basin, is a significant oil and gas-rich sags primarily distributed in the Permian, Triassic, and Jurassic, exhibiting complex oil and gas properties. In this study, source rock samples of Fengcheng Formation (P1f), Xiazijie Formation (P2x), Lower Wuerhe Formation (P2w), and Karamay Formation (T2k) in Mahu Sag and the crude oil samples of Baikouquan Formation (T1b) in Aihu oilfield were used as the main research objects. Various analytival techniques, including TOC analysis, rock pyrolysis, carbon isotope, saturated hydrocarbon chromatography, saturated hydrocarbon chromatography-mass spectrometry, and single well burial history-thermal history analysis, were employed to clarify the crude oil source in Baikouquan of Mahu Sag. The results demonstrate that the organic matter abundance of Fengcheng Formation in Mahu Sag surpassed that of the source rock of Lower Wuerhe Formation, with abundant organic matter content. The organic matter in the studied formations is primarily identified as type II kerogen, indicating a high oil generation potential. The crude oil extracted from the Baikouquan Formation has reached maturity, and its origin can be attributed to the prevailing weak oxidation-weak reduction sedimentary environment. Through oil-source correlation, the crude oil biomarkers in Mahu Sag and Fengcheng Formation source rocks were found to be well comparable, underscoring the significant contribution of Fengcheng Formation source rocks to the crude oil in the area. Two distinct stages of crude oil filling were identified in the Baikouquan Formation reservoir. The first occurred during the Early Jurassic, while the second took place in the Early Cretaceous periods. Both stages are closely associated with hydrocarbon generation and expulsion within the Fengcheng Formation source rocks. |
| ZHU Tao,LI Na,ZOU Yang,LIU Guoliang,ZHAO Yi,ZHOU Zuoming,WANG Ran,LIU Xinlong,SHENG Zhijian.2024.Geochemical Characteristics and Oil-source Rock Correlation of Crude Oil in Aihu Oilfield, Junggar Basin[J].Acta Geoscientica Sinica,45(6):1013-1022. |
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