利用转换波初至进行转换波剩余静校正Using first break of converted wave to perform remaining static calibration
高磊,潘树林,周熙襄,史艳华
GAO Lei1,PAN Shu-lin1,ZHOU Xi-xiang1,SHI Yan-hua2(1.Chengdu University of Science and Technology
摘要(Abstract)：
P-SV转换波静校正是转换波处理中的一个难题,常规的纵波静校正方法在转换波处理中有很大的局限性。在共转换点道集中求取转换波静校正量,要求进行精度较高的动校正,实际处理上有一定的难度。利用转换波初至求取静校正量可以避开这一难题。对转换波初至的组成和特点进行了讨论,通过推导共检波点道集中初至的时距曲线公式得到了共检波点道集中P-P-P波初至和P-P-SV波初至在一定偏移距范围内平行的结论。根据这一结论,进一步提出了通过τ-p变换自动拾取转换波初至的算法。通过对简单模型的分析得出了转换波初至拟合可以求取转换波静校正量的结论。对实际资料使用τ-p变换自动拾取转换波初至,然后进行拟合求取了静校正量,对算法进行了验证。
Static calibration of converted P-SV waves is a tough problem.Common P-wave's static calibration method is limited in the process of its treatment.Static calibration value of converted got in concentrated wave common conversion point demands high precision NMO calibration,however,it is difficult in practice.But we can avoid this problem by using first break of P-SV.Composition and characteristics of first arrival of converted wave are discussed,first break of P-P-P waves paralleled with the first break of P-P-SV waves within a certain offset distance by deducing T-D curve equation of first break of common detector gather is obtained.Based on this conclusion,the arithmetic of automatic picking up first break of P-SV waves by transforming is further proposed.By analysis of simple model,the conclusion is that first break of converted wave matching can request its static calibration value.First break of converted wave by using transforming for practical data is picked up,then static calibration value is requested by matching which demonstrates this arithmetic.
关键词(KeyWords)：
转换波初至;共检波点道集;τ-p变换;拟合
first break of converted wave;common detector gathering;transforming;matching
基金项目(Foundation):
作者(Author):
高磊,潘树林,周熙襄,史艳华
GAO Lei1,PAN Shu-lin1,ZHOU Xi-xiang1,SHI Yan-hua2(1.Chengdu University of Science and Technology
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