利用测井数据实现横波速度的反演及应用效果分析

Inversion of transverse wave velocity with logging data and its effect analysis of application

在地震数据的AVO(Amplitude Versus Offset)反演以及储层预测分析等中都需要横波速度信息,然而目前多数地区横波速度测井资料十分匮乏,在AVO反演中,往往凭经验公式获得,其精度很低.为了获得准确的横波速度信息,我们利用测井资料由最小二乘法实现横波速度的反演,针对华北油区赛83井实际测井数据,利用纵波速度、密度测井数据反演计算了该区的横波速度,并与实测横波速度作了对比,结果发现反演与实测结果取得了较好的一致性;还将该方法反演的横波速度与几种不同反演方法反演结果作了对比,获得较为一致的结果,算例证明了该方法的有效性.在测井资料缺少的情况下,该方法作为AVO反演横波速度的初始速度建模及储层预测分析应该是一种较为实用的方法.

It is well known that the information of transverse wave velocity is needful in the AVO（Amplitude Versus Offset）inversion and the reservoir forecasting,however,the logging data of transverse wave velocity is very lacking.In the AVO（Amplitude Versus Offset）inversion,the conventional method of transverse wave velocity gotten by experiential formulae,its precision is very poor.In order to get the velocity of transverse wave we have realized the inversion transverse wave velocity with the logging data,and applied it to compute the transverse wave velocity in the SAI 83 well region.The inversion results are in agreement with the experiential results.We have also given the computational compare in the application of AVO inversion.The results show that by this method gotten the transverse wave velocity applied as the initial value of AVO inversion the inversion precision has been clearly improved,proved the validity of this method.