基于走时拟合的微震源定位及拾震器布阵研究

为解决国内常见微震源定位技术存在的震源定位精度及其可靠性都较低的问题,提出采用匀速P波和走时拟合的震源定位方法,编制了基于Matlab的震源定位程序。对设想的不同油井压裂微震监测中拾震器布阵方案进行震源定位,绘出了震源定位点的三维坐标误差图,比较其定位精度并选出合理的拾震器布阵方案。仿真结果表明,该方法可提高震源的定位精度,同时可根据得到的震源定位误差图分析,在拾震器利用率最高的情况下,选出准确、合理、有效的拾震器布阵方案。

Microseismic Source Location Positioning and Distribution of Seismometer on Travel-Time Fitting

To solve the problem which both source positioning accuracy and reliability are lower,we use the source location method of uniform speed P wave and travel-time fitting,and a Matlab-based positioning procedure of the source was established.Source location was conducted for the different envisaged schemes of distributions of seismometers in the oil well fracturing microseismic monitoring,the 3D coordinate error maps of the location were drawed,the positioning accuracies were compared and a reasonable scheme of distribution of seismometer was selected.The simulation results show that this method improves the accuracy of source positioning,and according to the source position error pattern analysis obtained,we can select accurate,reasonable,effective scheme of distribution of seismometerin the case of the highest seismometer utilization.