Effect of Shale Reservoir Characteristics on Shale Oil Movability in the Lower Third Member of the Shahejie Formation, Zhanhua Sag

作     者：NING Chuanxiang MA Zhongliang JIANG Zhenxue SU Siyuan LI Tingwei ZHENG Lunju WANG Guozhen LI Fengxun NING Chuanxiang;MA Zhongliang;JIANG Zhenxue;SU Siyuan;LI Tingwei;ZHENG Lunju;WANG Guozhen;LI Fengxun

作者机构：State Key Laboratory of Shale Oil and Gas Enrichment and Effective DevelopmentWuxi 214126.JiangsuChina Wuxi Research Institute of Petroleum GeologySinopec Exploration and Production Research InstituteWuxi 214126JiangsuChina Unconventional Natural Gas InstituteChina University of PetroleumBeijing 102249China College of Earth Science.Jilin UniversityChangchun 130012China Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary MineralShandong University of Science and TechnologyQingdao 266590China Gas Hydrate Engineering Technology CenterGuangzhou Marine Geological SurveyGuangzhou 510075China 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2020年第94卷第2期

页      面：352-363页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：the National Science and Technology Major Project of China(Grant Nos.2017ZX05036-002-004.2017ZX05005-001-003) National Basic Research Program of China(Grant No.2014CB239105)for financial support 

主　　题：shale oil movability shale reservoirs pore structure characteristics lower third member of the Shahejie Formation 

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 t