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.

P315

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