Construction of a novel brittleness index equation and analysis of anisotropic brittleness characteristics for unconventional shale formations

作     者：Ke-Ran Qian Tao Liu Jun-Zhou Liu Xi-Wu Liu Zhi-Liang He Da-Jian Jiang Ke-Ran Qian;Tao Liu;Jun-Zhou Liu;Xi-Wu Liu;Zhi-Liang He;Da-Jian Jiang

作者机构：State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective DevelopmentBeijing 100083China Sinopec Key Laboratory of Seismic Elastic Wave TechnologyBeijing 100083China Key Laboratory of Shale Oil and Gas Exploration and ProductionSINOPECBeijing 100083China Ministry of Science and TechnologySINOPECBeijing 100728China Sinopec Petroleum Exploration and Production Research InstituteBeijing 100083China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2020年第17卷第1期

页      面：70-85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：supported by National Science and Technology Major Project(Grant No.2017ZX05049002) the NSFC and Sinopec joint key project(U1663207) support from the Sinopec Key Laboratory of Seismic Elastic Wave Technology 

主　　题：Brittleness Shale Rock Physics Anisotropy Voigt–Reuss–Hill average 

摘      要：The brittleness prediction of shale formations is of interest to researchers *** methods of brittleness prediction are usually based on isotropic models while shale is *** order to obtain a better prediction of shale brittleness,our study firstly proposed a novel brittleness index equation based on the Voigt–Reuss–Hill average,which combines two classical isotropic *** proposed method introduces upper and lower brittleness bounds,which take the uncertainty of brittleness prediction into *** addition,this method can give us acceptable predictions by using limited input ***,an anisotropic rock physics model was *** parameters were introduced into our model,which can be used to simulate the lamination of clay minerals and the dip angle of *** addition,rock physics templates have been built to analyze the sensitivity of brittleness ***,the effects of kerogen,pore structure,clay lamination and shale formation dip have been investigated in terms of *** prediction shows that the vertical/horizontal Young’s modulus is always below one while the vertical/horizontal Poisson’s ratio(PR)can be either greater or less than *** study finds different degrees of shale lamination may be the explanation for the random distribution of Vani(the ratio of vertical PR to horizontal PR).