波形匹配转换波剩余静校正实用技术

P-SV residual static corrections by matching waveform

基于纵横波共检波点叠加道相关的剩余静校正方法是利用纵波和转换波资料信息,解决转换波资料较大时移剩余静校正量的一种特殊处理方法。该方法在实际资料处理时,出现了纵横波速度比值求解不准确和资料呈现浅、中深层静校正量不一致的情况。详细分析了该方法出现以上情况的具体原因,针对该方法的工业化实施缺点,提出了改进措施;利用纵波构造控制解决转换波长波长剩余静校正量;采用常规剩余静校正进一步求解短波长剩余静校正量;应用长、短波长静校正量,再次进行速度分析和动校正,得到更精确的速度;进行动校正之后,采用基于纵横波CRP叠加道相关的剩余静校正方法和常规剩余静校正方法求解最终转换波检波点剩余静校正量。实际资料应用表明,改进措施后,结合文中工业化实施流程能够进一步提高方法在处理多波资料时的适应能力和静校正量的计算精度。

Residual statics method based on P-P and PSV CRP stacked traces is a special way for large time shift of P-SV data.However P/S wave velocity ratio is usually inaccurate and statics for all the layers are not same in data processing.In this paper,we propose an improved approach to solve the problems.First long wavelength residual statics for SV data are obtained with P wave control.Then short wavelength residual statics for SV data are calculated by conventional residual static corrections.After that velocity analysis and NMO are carried out with the long and short wavelength residual statics to obtain accurate velocity.Finally residual statics at receivers are calculated by residual statics based on P-P and P-SV CRP stacked traces and conventional methods.Applications to real data show that the proposed approach can improve residual statics for multi-wave data.