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中国鄂尔多斯盆地延安地区延长组下段原油的成因

Origin of Crude Oils in the Lower Yanchang Formation of Yan'an Area in Ordos Basin, China.

作者信息

Li Shutong, Zhang Shan, Deng Xiuqin, Chu Meijuan, Wang Yang, Qiu Junli, Chen Junlin, Duan Youwei, Wang Wei

机构信息

Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Gansu 730000, Lanzhou, China.

Key Laboratory of Oil and Gas Resources Exploration and Evaluation in Gansu Province, Gansu 730000, Lanzhou, China.

出版信息

ACS Omega. 2024 Dec 31;10(1):1019-1031. doi: 10.1021/acsomega.4c08278. eCollection 2025 Jan 14.

DOI:10.1021/acsomega.4c08278
PMID:39829474
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11740630/
Abstract

The clastic rocks of the Yanchang Formation in the Ordos Basin display poor physical properties but are rich in petroleum resources, exhibiting significant exploration potential. However, due to the existence of multiple sets of oil-bearing formations, hydrocarbon-generating formations, and a large longitudinal span, elucidating the correspondence between crude oil and source rocks is vital for further exploration. This study concentrates on the Lower Yanchang Formation of Triassic in the Yan'an area of the Ordos Basin, aiming to perform refined oil-source correlation. The findings indicate that the relative contents of diasteranes [DiaCβα (20S + 20R), DiaCβα (20S + 20R), and DiaCβα (20S + 20R)] are instrumental in categorizing hydrocarbon sources. By examination of the biomarker characteristics of crude oils in the Lower Yanchang Formation, it is detected that there are variations in hydrocarbon source contributions across the Wuqi, Shunning, and Xihekou areas and among different formations. In conclusion, the oils within the lower assembly in the study area primarily originate from a composite source, which includes Chang-7 black mudstone in the center of the lake basin, Chang-9 black mudstone in the Wuqi region, and Chang-9 dark mudstone in other areas. The Chang-7 dark mudstone in other areas plays a minor role in the lower assembly crude oil genesis, while the Chang-10 dark mudstone has a negligible influence on the lower assembly oil source of the Yanchang Formation.

摘要

鄂尔多斯盆地延长组碎屑岩物性较差，但石油资源丰富，具有较大的勘探潜力。然而，由于存在多套含油层系、生油层系，纵向跨度大，明确原油与烃源岩的对应关系对进一步勘探至关重要。本研究聚焦于鄂尔多斯盆地延安地区三叠系延长组下部，旨在进行精细油源对比。研究结果表明，甾烷（DiaCβα(20S + 20R)、DiaCβα(20S + 20R)和DiaCβα(20S + 20R)）的相对含量有助于烃源岩分类。通过对延长组下部原油生物标志物特征的研究，发现吴起、顺宁和西河口地区以及不同层系之间烃源贡献存在差异。研究区下组合原油主要来源于复合源，包括湖盆中心的长7黑色泥岩、吴起地区的长9黑色泥岩和其他地区的长9暗色泥岩。其他地区的长7暗色泥岩在下组合原油成因中作用较小，长10暗色泥岩对延长组下组合油源影响可忽略不计。

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