转换波各向异性校正方法与应用  

THE ANISOTROPY COMPENSATION METHOD FOR THE CONVERTED WAVE AND ITS APPLICATION

作　　者：马昭军[1] 唐建明[1] 康利[1] 王延坤[1] 

机构地区：[1]中国石油化工股份有限公司西南油气分公司勘探开发研究院德阳分院,四川德阳618000

出　　处：《大庆石油地质与开发》2010年第4期171-174,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技攻关项目（2008zx05000-002）资助.

摘　　要：为了实现宽方位转换波精确成像，基于横波分裂理论并采用两分量旋转技术实现了转换横波分裂分析，利用宽方位转换波资料进行了多层裂缝介质的层剥离横波分裂分析，完成了转换波方位各向异性校正研究。首先，利用两分量旋转技术求出第一层裂缝介质的各向异性方向、快慢横波时差等参数，然后将快、慢横波时差应用于慢波数据进行慢波时差补偿，最后根据第一层的方位角将快波和补偿后的慢波旋转回原来的径向、横向分量，从而使第一个裂缝层的转换波径向、横向分量得到方位各向异性校正，第一层裂缝介质也转换为各向同性介质。依此类推，进行其下多层各向异性介质横波分裂分析，并对各层转换波进行方位各向异性校正。该方法已用于宽方位三维三分量数据处理，校正了转换波方位各向异性对成像的影响，提高了转换波径向分量的成像质量。Based on the shear wave splitting theory, the converted shear wave splitting analysis is realized with the application of 2-component rotating technique for the accurate imagery of wide azimuth converted waves. The layer overburden shear wave splitting analysis is established based on the wide azimuth converted wave data, and the azimuthal anisotropy calibration of the converted waves are studied. First, according to 2-component roatating technique obtain the parameters of the fracture media in the first layer, such as the anisotropy orientation, fast-slow T- wave time difference, etc, apply the fast-slow T-wave time different to the slow wave data for time difference com- pensation of the slow wave, and finally make the fast wave and the slow wave compensate rotate to initial radial and horizontal components according to the azimuth of the first layer. Then the radial and horizontal components of the converted wave in the first fracture layer will get azimuthal anisotropy calibration, and the medium in the first layer fracture will be changed into isotropic medium. And so on and so forth, the shear wave splitting analysis in the anisotropic medium of other layers will be established, and azimuthal anisotropy calibration will be done to the converted wave in each layer. This method has applied to wide azimuth 3 D 3-component data processing. The application results indicate that the effect of azimuthal anisotropy of the converted wave on imagery has been calibrated and the imagery quality of the radial component has been improved.

关 键 词：宽方位 转换波 各向异性 快波 时差 

分 类 号：P631[天文地球—地质矿产勘探]