PP波与P-SV波叠前联合反演研究与应用

Prestack PP and P-SV wave joint inversion and its application

基于各向异性介质理论和Zoeppritz方程,利用PP波与P-SV波叠前地震资料能够反演纵波速度、横波速度、密度及各向异性系数,能够进一步计算得到弹性阻抗、泊松比、体积模量、剪切模量和拉梅常数等多种弹性参数。结合地质、测井、岩石物理等资料,对反演获得的各种参数进行优化,归纳总结其变化规律,提炼岩性判断和流体识别的各种敏感参数,实现含油气异常区域的准确圈定。综合分析多种参数异常的交叉分布区域,能够更准确地实现有利储层及油气分布的预测与评价。基于新场3D3C地震资料,将这套方法和技术思路应用到川西坳陷深层须家河组超致密非常规天然气藏储层预测与含气性检测中,获得了良好的实际应用效果。

Based on anisotropic theory and Zoeppritz equation, we inverted velocity, density and anisotropic coefficients of P and converted waves using joint inversion, and calculated elastic parameters such as elastic impedance, Poisson's ratio, and Lame's constant. Combining with geologic and logging data, we further optimized the resulted parameters and singled out some sensitive parameters to detect hydrocarbon potentials. A case study in Xingchang, western Sichuan showed that the proposed methods are applicable for reservoir prediction and hydrocarbon potential detection in ultra-tight deep gas reservoir in the west of Sichuan.