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Sedimentary Environments of Cambrian-Ordovician Source Rocks and Ultra-deep Petroleum Accumulation in the Tarim Basin

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Acta Geologica Sinica(English Edition) 2022年第4期96卷 1259-1276页

作者： ZHANG Shuichang SU Jin WANG Xiaomei MA Sihong Key Laboratory of Petroleum Geochemistry CNPCBeijing 100083China State Key Laboratory for Enhancing Oil Recovery Research Institute of Petroleum Exploration&DevelopmentPetroChinaBeijing 100083China

The Tarim Basin is the only petroliferous basin enriched with marine oil and gas in *** is presently also the deepest basin for petroleum exploration and development in the *** are two main sets of marine Source Rocks(SRs)in the Tarim Basin,namely the high over-mature Cambrian-Lower Ordovician(∈-O_(1))and the moderately mature Middle-Upper Ordovician(O_(2-3)).The characteristic biomarkers of SRs and oils indicate that the main origin of the marine petroleum is a mixed source of∈-O_(1) and O_(2-3) *** increasing burial,the hydrocarbon contribution of the∈-O_(1) SRs gradually *** by the superposition of multi-stage hydrocarbon-generation of the SRs and various secondary alteration processes,the emergence and abnormal enrichment of terpenoids,thiophene and trimethylaryl isoprenoid in deep reservoirs indicate a complex genesis of various deep oils and *** the analysis of the biofacies and sedimentary environments of the∈-O_(1) and O_(2-3) SRs,it is shown that the lower Paleozoic high-quality SRs in the Tarim Basin were mainly deposited in a passive continental margin and the gentle slope of the platform,deep-water shelf and slope facies,which has exhibited a good response to the local tectonic-sedimentary *** slope of the paleo-uplift is the mutual area for the development of carbonate reservoirs and the deposition of marine SRs,which would be favorable for the accumulation of *** to the characteristics of low ground temperature,the latest rapid and deep burial does not cause massive oil-cracking in the paleo-uplift and slope ***,it is speculated that the marine reservoirs in the slope of the Tabei Uplift are likely to be a favorable area for deep petroleum exploration,while the oilcracking gas would be a potential reserve around the west margin of the Manjiaer *** were generated from various unit SRs,mainly migrating along the lateral unconformities or reservoirs and the

关键词： biomarkers organic carbon isotopes compound specific isotopes marine source rock deep reservoirs

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Origin of Crude Oil in the Lunnan Region,Tarim Basin

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Acta Geologica Sinica(English Edition) 2010年第5期84卷 1157-1169页

作者： LI Sumei PANG Xiongqi YANG Haijun XIAO Zhongyao GU Qiaoyuan ZHANG Baoshou WANG Haijiang State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China PetroChina Tarim Oilfield Company Kuerle 841000 Xinjiang China

The oil source of the Tarim Basin has been controversial over a long time. This study characterizes the crude oil and investigates the oil sources in the Lunnan region, Tarim Basin by adopting compound specific isotopes of n-alkanes and biomarkers approaches. Although the crude oil has a good correlation with the Middle-Upper Ordovician （02＋3） source rocks and a poor correlation with the Cambrian-Lower Ordovician （C-O1） based on biomarkers, the ~3C data of n-alkanes of the Lunnan oils show an intermediate value between C-O1 and 02＋3 genetic affinity oils, which suggests that the Lunnan oils are actually of an extensively mixed source. A quantification of oil mixing was performed and the results show that the contribution of the Cambrian-Lower Ordovician source rocks ranges from 11% to 70% （averaging 36%）, slightly less than that of the Tazhong uplift. It is suggested that the inconsistency between the biomarkers and od3C in determining the oil sources in the Lunnan Region results from multiple petroleum charge episodes with different chemical components in one or more episode（s） and different sources. The widespread marine mixed-source oil in the basin indicates that significant petroleum potential in deep horizons is possible. To unravel hydrocarbons accumulation mechanisms for the Lunnan oils is crucial to further petroleum exploration and exploitation in the region.

关键词： Lunnan uplift biomarkers compound specific isotopes oilsource rock correlation mixed-source oil

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