P波资料HTI介质剩余时差校正方法研究

A study of residual moveout correction method for P wave of HTI media

随着3D地震勘探技术的发展,对各向异性介质地震波传播理论的研究也在不断深入。不考虑HTI介质影响的动校正后的叠前CMP道集中仍存在着"正弦型"的剩余时差,传统的基于Dix时差公式的速度分析和动校正已无法满足处理的精度要求。通过借鉴统计剩余静校正的参考道互相关法和最小方差法,并结合HTI介质特征,提出了基于参考道的统计各向异性时差校正方法。提取各向异性时差并进行校正,对其叠加道的纵向分辨率的提高进行了定量分析。实验结果表明,统计各向异性剩余时差校正法消除了由HTI介质产生的剩余时差,同时也提高了纵向分辨率,从而使叠加剖面的质量得到显著提高。

With the development of 3D seismic exploration techniques, the study of seismic wave propagation theory in ani-sotropic media is going deeper. Without considering the impact of HTI media, prestack CMP trace gathers still remain ＂sinu-soidal＂ residual moveout, the traditional velocity analysis and NMO based on Dix time difference formula cant meet the require-ments of precision. By drawing from statistics residual static correction reference track cross -correlation and minimum vari-ance method, and combining the feature of HTI media, propose a method of correction of statistical anisotropy residual move-out based on reference trace. By extracting and revising the anisotropic moveout to enhance quality of the stacked profile, and give a quantitative analysis of increases of vertical resolution of stacked trace. Experiment result shows that methods of calibra-tion of statistical anisotropy residual moveout eliminate residual moveout caused by anisotropy, and increase the vertical resolu-tion, and then enhance the quality of stacked profile obviously.