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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。
The automatic pick-up of the first arrival time is a key part of microseismic data processing. There are some similarities between the seismic traces, but the degree of similarity is limited. Therefore, when using the traditional correlation method to calculate the first arrival, the first-arrival pick-up error often occurs due to the lack of similarity between the two tracks. Based on this, an improved correlation method is proposed, that is, the reference time window is constructed by the sampling function. This method overcomes the shortcomings of traditional methods that rely too much on the similarity between channels. Finally, the method is applied to the actual data, get good results.