纵横波速度反演在气层识别中的应用

提出一种部分叠加资料的反演方法。部分叠加资料保留了原有的大量信息，在测井及构造层位的约束下，建立最符合地下实际情况的初始模型。通过非线性最优化理论，采用逐道外推技术，能同时反演出每一个点更准确的纵波和横波速度，进而可以求得纵横波速度比及泊松比，为储层预测和储集层内的流体识别提供丰富的弹性参数信息。

The Application of P-Wave and S-Wave Velocity Inversion to the Identification of Gas Layer

An partial stack gather inversion method is put forward. Partial stack data retain original rich information. Restrained by logging and structural interperation results, initial model may be the most close to the actual underground conditions. Through nonlinear optimization theory, using trace by trace extrapolation, more accurate P-wave and S-wave velocity of every point can be inverted simultaneously, and then the P-wave and S-wave velocity ratio and Poisson’s ratio can be obtained, so that provide rich elastic parameters information for reservoir prediction and fluid identification.