P—SV波和SH波的AVO分析

地震反射振幅随炮检距变化的规律不仅纵波存在,横波同样也具有与物性参数有关的AVO特征。本文就P-SV波和SH波的AVO分析作了一些基础工作,其步骤与P波相仿,即从Zoeppritz方程出发,经过一系列可允许的简化,最后导出一些有地质地震属性的计算公式。研究结果发现:①利用P-SV波可以得到与SH波完全一样的地震属性;②从这些属性的数学模型可以发现,只要将现有P波的AVO分析软件稍作一些修改,便可用于横波AVO分析。本文一系列的模型演算结果说明,横波AVO是一项有潜力的技术。

AVO analysis of P-SV and SH waves.

AVO phenomenon relating to petrophysical parameters can be seen in both compressional wave and shear wave. Basic AVO analysis of P-SV and SH waves has been done in the procedure which is similar to that for compressional wave AVO analysis, namely.starting from a series of allowable reduction of the Zoeppritz's e-quations to get some formulae which have geological and seismic attributions. Research result leads to the conclusion that the seismic property of SH wave can be derived from P-SV wave, and that slightly-revised AVO analysis software for compressional wave can also be applied to AVO analysis of shear wave. A series of modeling computation says that AVO analysis for shear wave is very potential.