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Using first break of converted wave to perform remaining static calibration

GAO Lei1,PAN Shu-lin1,ZHOU Xi-xiang1,SHI Yan-hua2(1.Chengdu University of Science and Technology,Chengdu 610059,China;2.Consulting Department of Shandong Computing Center,Jinan 250014,China)  
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.
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