改进相关法对震相初至的拾取

Improved Correlation Method for Picking Seismic First Break

初至时间的自动拾取是微地震数据处理的一个关键环节。地震道之间具有一定的相似性,但相似程度有限,所以用传统的相关法求取初至时,常会因为道与道之间的相似性不足而产生初至拾取上的偏差。基于此,提出改进的相关法,即通过抽样函数构造参考道时窗。该方法克服了传统方法过于依赖道间相似性的缺点。最后将该方法应用到实际数据中,得到很好的效果。

Automatic picking seismic first break is a critical part of seismic data processing. There are some similarities between microseismic signals which not exactly, errors may come from lack of similarities in picking seismic first break. Based on this, the traditional correlation method was improved, that is creat a reference trace through sample function. This method overcomes the faults of traditional methods which rely too much on similarity between traces. Finally, the method is applied to the factual data and gets a better outcome.