Estimation of fracture density and orientation from azimuthal elastic impedance difference through singular value decomposition

作     者：Lin Li Guang-Zhi Zhang Jun-Zhou Liu Lei Han Jia-Jia Zhang Lin Li;Guang-Zhi Zhang;Jun-Zhou Liu;Lei Han;Jia-Jia Zhang

作者机构：School of GeosciencesChina University of Petroleum(East China)QingdaoShandong 266580China Sinopec Exploration and Production Research InstituteBeijing100083China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2021年第18卷第6期

页      面：1675-1688页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：sponsorship of the National Natural Science Foundation of China(41674130,U19B2008) the Postgraduate Innovation Project in China University of Petroleum(East China)(YCX2021016)for their funding this research 

主　　题：Singular value decomposition HTI media Azimuthal elastic impedance inversion Fracture density Fracture orientation 

摘      要：Accurate estimation of fracture density and orientation is of great significance for seismic characterization of fractured ***,we propose a novel methodology to estimate fracture density and orientation from azimuthal elastic impedance(AEI)difference using singular value decomposition(SVD).Based on Hudson s model,we first derive the AEI equation containing fracture density in HTI media,and then obtain basis functions and singular values from the normalized AEI difference utilizing *** shows that the basis function changing with azimuth is related to fracture orientation,fracture density is the linearly weighted sum of singular values,and the first singular value contributes the most to fracture ***,we develop an SVD-based fracture density and orientation inversion approach constrained by smooth prior elastic *** example shows that fracture density and orientation can be stably estimated,and the correlation coefficient between the true value and the estimated fracture density is above 0.85 even when an S/N ratio of *** data example shows that the estimated fracture orientation is consistent with the interpretation of image log data,and the estimated fracture density reliably indicates fractured gas-bearing reservoir,which could help to guide the exploration and development of fractured reservoirs.