微地震观测系统及震源定位目标函数研究

Study of Recording System and Objective Function for Microseismic Source Location

通过模型试验,分别讨论地面、井下观测系统以及二者的组合对于定位结果的影响。试验结果表明,联合采用地面与井下观测系统能够有效提高震源定位精度。在采用井下观测系统的基础上,对比几种常用目标函数的应用效果,并在更有效的走时残差计算方法基础上,提出一种新的目标函数。模型数据及实际资料的处理结果表明,提出的目标函数在水平方向以及垂向上均具有较好的收敛性,其震源定位结果也更准确、可靠。

Through synthetic data tests,the influence on source location results of surface and downhole recording systems are discussed,as well as the combination of both.The results indicate that joint use of surface and dowrhole recording systems can significantly improve the location accuracy.With the downhole recording system,the location results obtained by adopting different objective functions in source location algorithm are compared.Moreover,a new objective function is also proposed.The effectiveness of the new objective function is tested on synthetic and real data sets.The results demonstrate that this objective function shows better convergency in both horizontal and vertical directions,and it can produce more reliable location results.