中文摘要：

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。

英文摘要：

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.