基于强事件约束的微地震剩余静校正量估算方法

针对低信噪比条件下微地震剩余静校正量估算困难的问题,研究了射孔事件数据道间的两两相关信息与强微地震事件同相轴光滑性约束条件相结合的微地震剩余静校正量估算方法。该方法不仅利用了射孔事件的任意两道相关信息,增加微地震剩余静校正量估算时的信息量;还利用了剩余静校正后强微地震事件同相轴的光滑性约束信息,实现提高低信噪比条件下剩余静校正量估算精度的目的。模型资料和实际资料的测试结果表明,该方法对低信噪比数据的剩余静校正估算具有适应性强、效果好的特点。

 Estimation of residual statics is particularly difficult for microseismic data with low signal-to-noise ratio.Aiming at this problem,a new method for calculating microseismic residual statics is proposed,which combines with the information of mutual cross-correlation of recorded traces in perforation event and the strong-event smoothness constraint condition.This method makes use of the mutual cross-correlation information of the perforation event to increase the amount of information during the estimation of microsesmic residual statics,as well as the strong microseismic events smoothness constraint information after the residual static correction,to improve the precision of residual statics estimation under the low signal-to-noise-ratio condition.Finally,the results of residual statics estimation on numerical and real data prove the robustness and effectiveness of the new method for microseismic data with low signal-to-noise ratio.

国家重点基础研究发展计划(973计划)项目“优质页岩气储层预测及精细表征”(2014CB239201)资助。