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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
余洋洋1, 梁春涛2, 杜瑶1, 王宇玺1, 庄园旭1
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
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。
关键词:  微地震监测  微地震定位  震源机制  应力分析
DOI:
分类号:P315
基金项目:国家自然科学基金(U19A2098)、四川省地震局地震科技专项(LY2104)和科技创新团队(201901)共同资助
Analysis of Shale Gas Hydraulic Fracturing Effect and Stress State Based on Joint Inversion Algorithm(JSSA)of Microseismic Location and Focal Mechanism
Yu Yangyang1, Liang Chuntao2, Du Yao1, Wang Yuxi1, Zhuang Yuanxu1
1.Sichuan Earthquake Agency, Chengdu 610041, China;2.Key Laboratory of Earth Exploration and Information Technique of Education Ministry of China, Chengdu University of Technology, Chengdu 610059, China
Abstract:
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.
Key words:  Microseismic monitoring  Microseismic location  Focal mechanism  Stress analysis