Permeability measurement of the fracture-matrix system with 3D embedded discrete fracture model

作     者：Bao Jia Cheng-Gang Xian Bao Jia;Cheng-Gang Xian

作者机构：State Key Laboratory of Petroleum Resources and ProspectingChina University of Petroleum(Bejing)Beijing 102249China Unconventional Petroleum Research InstituteChina University of Petroleum(Bejing)Bejing 102249China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2022年第19卷第4期

页      面：1757-1765页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 082002[工学-油气田开发工程] 

基　　金：supported by the Science Foundation of China University of Petroleum,Beijing (No.00000) the Strategic Cooperation Technology Projects of CNPC and CUPB (ZLZX2020-01) CNPC Science and Technology Major Project (2021ZZ10-02)。 

主　　题：Permeability Fracture Pulse-decay Shale Viscosity 

摘      要：In this work, we performed the pulse-decay experiment on a fractured shale core and applied the 3 D embedded discrete fracture model(EDFM) to simulate the experiment process. The irregularly rough fracture surface was depicted in detail using a 3 D scanner. Then the fracture surface profile was imported in the discrete fracture network model to simulate the flow process in the fracture-matrix system realistically. History matching was efficiently performed to simultaneously obtain porosity and permeability for the matrix and fracture. Gas properties after applying nanopore confinement were obtained by modifying Sutton s viscosity correlation with sensitivity analysis on the pore diameter ranging from 2 to50 nm. Nanopore confinement results in low matched permeability due to viscosity reduction in the matrix-only porous media. The fracture-matrix system complicates the interpretation of nanopore confinement impact on flow behavior in shale reservoirs. Different scenarios of the highly fractured and matrix-dominated systems were discussed in detail by constructing the digital twin model.