Performance-based fractal fracture model for complex fracture network simulation  

作　　者：Wen-Dong Wang Yu-Liang Su Qi Zhang Gang Xiang Shi-Ming Cui 

机构地区：[1]School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China [2]CCDC Downhole Service Company,Chengdu 610213, Sichuan, China [3]China National Petroleum Corporation, Jilin Oil Field,Xinmu Oil Production Plant, Jilin 138000, China

出　　处：《Petroleum Science》2018年第1期126-134,共9页石油科学（英文版）

基　　金：supported by National Natural Science Foundation of China(No.51674279);China Postdoctoral Science Foundation(No.2016M602227);a grant from National Science and Technology Major Project(No.2017ZX05049-006)

摘　　要：The paper presents a novel hydraulic fracturing model for the characterization and simulation of the complex fracture network in shale gas reservoirs. We go beyond the existing method that uses planar or orthogonal conjugate fractures for representing the ＇＇complexity＇＇ of the network. Bifurcation of fractures is performed utilizing the Lindenmayer system based on fractal geometry to describe the fracture propagation pattern, density and network connectivity. Four controlling parameters are proposed to describe the details of complex fractures and stimulated reservoir volume（SRV）. The results show that due to the multilevel feature of fractal fractures, the model could provide a simple method for contributing reservoir volume calibration. The primary-and second-stage fracture networks across the overall SRV are the main contributions to the production, while the induced fracture network just contributes another 20% in the late producing period. We also conduct simulation with respect to different refracturing cases and find that increasing the complexity of the fracture network provides better performance than only enhancing the fracture conductivity.The paper presents a novel hydraulic fracturing model for the characterization and simulation of the complex fracture network in shale gas reservoirs. We go beyond the existing method that uses planar or orthogonal conjugate fractures for representing the ＇＇complexity＇＇ of the network. Bifurcation of fractures is performed utilizing the Lindenmayer system based on fractal geometry to describe the fracture propagation pattern, density and network connectivity. Four controlling parameters are proposed to describe the details of complex fractures and stimulated reservoir volume（SRV）. The results show that due to the multilevel feature of fractal fractures, the model could provide a simple method for contributing reservoir volume calibration. The primary-and second-stage fracture networks across the overall SRV are the main contributions to the production, while the induced fracture network just contributes another 20% in the late producing period. We also conduct simulation with respect to different refracturing cases and find that increasing the complexity of the fracture network provides better performance than only enhancing the fracture conductivity.

关 键 词：Fractal geometry Fractal fracture model Complex fracture network characterization Contributing reservoirvolume REFRACTURING 

分 类 号：TE319[石油与天然气工程—油气田开发工程]