Investigating microscopic seepage characteristics and fracture effectiveness of tight sandstones:a digital core approach

作     者：Jing Li Xiao-Rong Li Ming-Shui Song Hui-Min Liu Yong-Cun Feng Chen Liu Jing Li;Xiao-Rong Li;Ming-Shui Song;Hui-Min Liu;Yong-Cun Feng;Chen Liu

作者机构：College of Pipeline and Civil EngineeringChina University of Petroleum(East China)Qingdao 266580ShandongChina College of Safety and Ocean EngineeringChina University of Petroleum(Beijing)Bejing 102220China Sinopec Shengli Oilfield CompanyDongying 257000ShandongChina College of Petroleum EngineeringChina University of Petroleum(Beijing)Bejing 102220China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2021年第18卷第1期

页      面：173-182页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 0808[工学-电气工程] 08[工学] 0820[工学-石油与天然气工程] 0707[理学-海洋科学] 0817[工学-化学工程与技术] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0816[工学-测绘科学与技术] 0827[工学-核科学与技术] 0813[工学-建筑学] 0703[理学-化学] 082002[工学-油气田开发工程] 0814[工学-土木工程] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.41972138) the Technology Major Project of China(Grant No.ZD2019-183007,2016ZX05002-002)。 

主　　题：Tight sandstone Digital core approach CT scanning Microscopic seepage characteristics Fracture effectiveness 

摘      要：Microscopic seepage characteristics are critical for the evaluation of tight sandstone reservoirs.In this study,a digital core approach integrating microscopic seepage simulation and CT scanning was developed to characterize microscopic seepage and fracture effectiveness(the ratio of micro-fractures that contributes to fluid flow)of tight sandstones.Numerical simulations were carried out for characterizations of tight sandstones.The results show that the axial permeability of the investigated cylindrical tight sandstone from Junggar Basin in China is 0.460μm~2,while the radial permeability is 0.3723μm~2,and the axial and radial effective fracture ratios are 0.4387 and 0.4806,respectively,indicating that cracks are not fully developed and the connectivity between micro-cracks is poor.Directional permeability that is difficult to measure by laboratory experiments can be obtained readily using the proposed method in this paper.The results provide important information for improving the exploration and development of tight sandstone reservoirs.