地面微地震监测SET震源定位特性研究  

Characteristics of source localization by seismic emission tomgraphy for surface based on microseismic monitoring

作　　者：王维波[1,2] 周瑶琪 春兰[4] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国石油大学信息与控制工程学院,山东青岛266580 [3]中国石油大学地球科学与技术学院,山东青岛266580 [4]中国石油西南油气田分公司低效油气开发事业部,四川成都610017

出　　处：《中国石油大学学报（自然科学版）》2012年第5期45-50,55,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金面上项目(40872095)

摘　　要：用数值模拟方法研究基于Semblance参数计算的地震发射层析成像(SET)成像的特点,包括SET定位准确性与站点个数、信号信噪比、站点分布结构的关系等。根据数值模拟结果和实际二十余口井水力压裂的监测经验,给出地面微地震监测站点个数选择的基本原则。理论和实际监测结果表明,只要监测站点个数足够多,就能满足可识别微地震信号的信噪比阈值的要求,利用地面微地震监测实现压裂裂缝监测是可行的。The characteristics of seismic emission tomgraphy （SET） based on semblance calculation by numerical simulation were studied, which included the relationship between accuracy of SET localization and number of traces, signal-to-noise ratio （SNR） of signals, topology of traces＇ deployment. A criterion for choosing number of traces for surface microseismic monitoring was given by numerical simulation results and monitoring practice of about 20 wells＇ hydraulic fracturing. It is proved by theo- retical study and monitoring practice that surface microseismic monitoring can determine parameters of hydraulic induced frac- tures, if the number of traces is large enough to satisfy the need for SNR threshold of detectable microseismic signals.

关 键 词：地面微地震监测 Semblance 地震发射层析成像 信噪比阈值 水力压裂 

分 类 号：P315[天文地球—地震学]