基于微地震定位与震源机制联合反演算法(JSSA)分析页岩气水力压裂效果及应力状态  

Analysis of Shale Gas Hydraulic Fracturing Effect and Stress State Based on Joint Inversion Algorithm(JSSA)of Microseismic Location and Focal Mechanism

作　　者：余洋洋 梁春涛[2] 杜瑶[1] 王宇玺[1] 庄园旭 Yu Yangyang;Liang Chuntao;Du Yao;Wang Yuxi;Zhuang Yuanxu(Sichuan Earthquake Agency,Chengdu 610041,China;Key Laboratory of Earth Exploration and Information Technique of Education Ministry of China,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]四川省地震局,成都610041 [2]成都理工大学,地球探测与信息技术教育部重点实验室,成都610059

出　　处：《中国地震》2021年第2期273-284,共12页Earthquake Research in China

基　　金：国家自然科学基金(U19A2098);四川省地震局地震科技专项(LY2104);科技创新团队(201901)共同资助。

摘　　要：采用微地震定位与震源机制联合反演算法(JSSA算法)对威H3-1井的实际压裂数据进行处理,得到1507个事件的空间位置和震源机制信息。根据联合反演的震源机制信息,计算事件的P轴分布,从而解释压裂施工区域的应力分布状态。通过对压裂施工区域的综合解释分析,表明工区西侧存在较大的SN向天然裂缝,以及在水平井附近存在较小的压裂裂缝,从而达到了评价压裂效果、指导压裂施工的目的。Through analyzing the field fracturing data of WeiH3-1 well,we obtained the spatial positions and focal mechanisms of 1507 events simultaneously by using the joint inversion algorithm(Joint Source Scanning Algorithm,JSSA).Based on the focal mechanisms of joint inversion,the P axes of events can be calculated,and the stress distribution state of the work area can be explained.Through the comprehensive interpretation and analysis of the work area,we find that there is a large-scale natural fracture with north-south trend in the west of the work area,and some small-scale fracturing fractures near the horizontal well,so as to evaluate the fracturing effect and guide the fracturing operation.

关 键 词：微地震监测 微地震定位 震源机制 应力分析 

分 类 号：P315[天文地球—地震学]