| Effect of Shale Reservoir Characteristics on Shale Oil Movability in the Lower Third Member of the Shahejie Formation,Zhanhua Sag |
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| 作者姓名： | NING Chuanxiang MA Zhongliang JIANG Zhenxue SU Siyuan LI Tingwei ZHENG Lunju WANG Guozhen LI Fengxun |
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| 作者单位： | State Key Laboratory of Shale Oil and Gas Enrichment and Effective Development;Wuxi Research Institute of Petroleum GeologySinopec Exploration and Production Research Institute;Unconventional Natural Gas Institute;College of Earth Science.Jilin University;Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral;Gas Hydrate Engineering Technology Center |
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| 基金项目： | We gratefully acknowledge the National Science and Technology Major Project of China (Grant Nos. 2017ZX05036-002-004，2017ZX05005-001-003) and National Basic Research Program of China (Grant No. 2014CB239105) for financial support. The authors are grateful to the Geology Scientific Research Institute of the Shengli Oilfield Company for providing the study samples. |
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| 摘 要： | To reveal the effect of shale reservoir characteristics on the movability of shale oil and its action mechanism in the lower third member of the Shahejie Formation(Es3l), samples with different features were selected and analyzed using N2 adsorption, high-pressure mercury injection capillary pressure(MICP), nuclear magnetic resonance(NMR), high-speed centrifugation, and displacement image techniques. The results show that shale pore structure characteristics control shale oil movability directly. Movable oil saturation has a positive relationship with pore volume for radius > 2 μm, as larger pores often have higher movable oil saturation, indicating that movable oil is present in relatively larger pores. The main reasons for this are as follows. The relatively smaller pores often have oil-wetting properties because of organic matter, which has an unfavorable effect on the flow of oil, while the relatively larger pores are often wetted by water, which is helpful to shale oil movability. The rich surface provided by the relatively smaller pores is beneficial to the adsorption of immovable oil. Meanwhile, the relatively larger pores create significant pore volume for movable oil. Moreover, the larger pores often have good pore connectivity. Pores and fractures are interconnected to form a complex fracture network, which provides a good permeability channel for shale oil flow. The smaller pores are mostly distributed separately;thus, they are not conducive to the flow of shale oil. The mineral composition and fabric macroscopically affect the movability of shale oil. Calcite plays an active role in shale oil movability by increasing the brittleness of shale and is more likely to form micro-cracks under the same stress background. Clay does not utilize shale oil flow because of its large specific surface area and its block effect. The bedding structure increases the large-scale storage space and improves the connectivity of pores at different scales, which is conducive to the movability of shale oil.
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| 关 键 词： | SHALE oil MOVABILITY SHALE RESERVOIRS pore structure characteristics LOWER THIRD MEMBER of the Shahejie Formation |
| 收稿时间： | 2018/10/31 0:00:00 |
| 修稿时间： | 2019/4/17 0:00:00 |
Effect of Shale Reservoir Characteristics on Shale Oil Movability in the Lower Third Member of the Shahejie Formation,Zhanhua Sag |
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| Authors: | NING Chuanxiang MA Zhongliang JIANG Zhenxue SU Siyuan LI Tingwei ZHENG Lunju WANG Guozhen LI Fengxun |
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| Institution: | 1 State Key Laboratory of Shale Oil and Gas Enrichment and Effective Development, Wuxi 214126, Jiangsu, China
2 Wuxi Research Institute of Petroleum Geology, Sinopec Exploration and Production Research Institute, Wuxi 214126, Jiangsu, China;3 Unconventional Natural Gas Institute, China University of Petroleum, Beijing 102249, China;4 College of Earth Science, Jilin University, Changchun 130012, China
5 Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral, Shandong University of Science and Technology, Qingdao 266590, China;6 Gas Hydrate Engineering Technology Center, Guangzhou Marine Geological Survey, Guangzhou 510075, China |
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| Abstract: | To reveal the effect of shale reservoir characteristics on the movability of shale oil and its action mechanism in the lower third member of the Shahejie Formation (Es3l), samples with different features were selected and analyzed using N2 adsorption, high‐pressure mercury injection capillary pressure (MICP), nuclear magnetic resonance (NMR), high‐speed centrifugation, and displacement image techniques. The results show that shale pore structure characteristics control shale oil movability directly. Movable oil saturation has a positive relationship with pore volume for radius > 2 μm, as larger pores often have higher movable oil saturation, indicating that movable oil is present in relatively larger pores. The main reasons for this are as follows. The relatively smaller pores often have oil‐wetting properties because of organic matter, which has an unfavorable effect on the flow of oil, while the relatively larger pores are often wetted by water, which is helpful to shale oil movability. The rich surface provided by the relatively smaller pores is beneficial to the adsorption of immovable oil. Meanwhile, the relatively larger pores create significant pore volume for movable oil. Moreover, the larger pores often have good pore connectivity. Pores and fractures are interconnected to form a complex fracture network, which provides a good permeability channel for shale oil flow. The smaller pores are mostly distributed separately; thus, they are not conducive to the flow of shale oil. The mineral composition and fabric macroscopically affect the movability of shale oil. Calcite plays an active role in shale oil movability by increasing the brittleness of shale and is more likely to form micro‐cracks under the same stress background. Clay does not utilize shale oil flow because of its large specific surface area and its block effect. The bedding structure increases the large‐scale storage space and improves the connectivity of pores at different scales, which is conducive to the movability of shale oil. |
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| Keywords: | shale oil movability shale reservoirs pore structure characteristics lower third member of the Shahejie Formation |
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