The Impact of Fractures on Shale Oil and Gas Enrichment and Mobility: A Case Study of the Qingshankou Formation in the Gulong Depression of the Songliao Basin, NE China

Xuefeng Bai, Junhui Li, Wei Liu (), Jijun Li, Xiuli Fu, Yangxin Su, Qiang Zheng, Shuangfang Lu, Xu Zeng, Hang You and Yingchao Xu
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Xuefeng Bai: School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China
Junhui Li: Exploration and Development Research Institute, Daqing Oilfield Company Ltd., Daqing 163712, China
Wei Liu: National Key Laboratory for Multi-Resource Collaborated Green Development of Continental Shale Oil, Daqing 163712, China
Jijun Li: School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China
Xiuli Fu: Exploration and Development Research Institute, Daqing Oilfield Company Ltd., Daqing 163712, China
Yangxin Su: Exploration and Development Research Institute, Daqing Oilfield Company Ltd., Daqing 163712, China
Qiang Zheng: Exploration and Development Research Institute, Daqing Oilfield Company Ltd., Daqing 163712, China
Shuangfang Lu: School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China
Xu Zeng: Research Institute of Petroleum Exploration & Development, Beijing 100083, China
Hang You: School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China
Yingchao Xu: School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China

Energies, 2024, vol. 17, issue 17, 1-17

Abstract: To study the impact of faults on the enrichment and mobility of shale oil in the Gulong area, representative rock samples were selected in this paper. Based on geochemical data and chemical kinetics methods, coupled with shale oil enrichment and mobility analysis techniques, the shale oil generation quantity and in situ oil content were evaluated from the perspectives of shale oil generation and micro migration, and the mobility of shale oil was revealed. At the same time, the hydrocarbon expulsion efficiency (HEE) of shale was qualitatively and quantitatively characterized, combined with the development of faults. The research results indicate that the study area mainly develops organic-rich felsic (ORF)/organic-containing felsic (OCF) shale, their proportion in both wells exceeds 65%, and the resource amount is the largest in this type of lithofacies. The development of a fault controls the enrichment of shale oil, and the in situ oil content and oil saturation index (OSI) of the shale in well Y58, which is close to the fault, are significantly worse than those in well S2. Well Y58 has 9.52 mg/g and 424.83 mg/g TOC respectively, while well S2 has 11.34 mg/g and 488.73 mg/g TOC respectively. The fault enhanced the migration of shale oil, increasing the efficiency of oil expulsion. As a result, the components with weak polarity or small molecules, such as saturated hydrocarbons and low carbon number n-alkanes, are prone to migration, reducing the mobility of shale oil.

Keywords: shale oil; enrichment; mobility; Gulong depression; Qingshankou formation (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: 2024
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