三维转换波处理技术研究及应用

3D converted wave seismic data processing technology and its application

转换波地震勘探能同时获得纵波与转换横波资料,更有利于预测地层岩性、流体性质以及裂隙分布。但由于转换波本身传播路径的特殊性,不能直接采用常规的纵波处理方法来实现,三维转换波处理技术一直是转换波地震勘探的难点。针对西部某地区三维转换波地震资料的特点,进行了转换波处理技术研究,确立了转换波静校正、多参数迭代速度分析和VTI介质各向异性叠前时间偏移等关键技术,建立了配套的转换波处理流程,使研究区转换波资料的成像质量得到明显改善,为后续纵、横波联合解释提供了可靠的资料保障。

Converted wave seismic exploration can obtain P-wave and converted S-wave data,which helps the prediction of lithology,fluid properties and fracture distribution.In the consideration of the particularity of converted wave propagation path,the 3D converted wave seismic data processing technology which remains a difficult problem in converted wave seismic exploration for the conventional P-wave seismic data processing technology cannot be used to process converted wave seismic data.Based on the 3D converted wave seismic data processing in an area of Western China,related processing researches are conducted and the key technologies of the converted wave static,multi-parameters velocity analysis and VTI anisotropic prestack time migration are developed,establishing a set of converted wave seismic data processing procedures.It obviously improves the structural imaging quality in the study area,and provides reliable data for the followed joint interpretation of P-wave and S-wave.