VTI介质叠前时间偏移及实例分析  

Pre-stack Time Migration in VTI Media and It's Application

作　　者：王建立[1] 周纳[2] 王真理[1] 杨长春[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]胜利油田分公司物探研究院,山东东营257022

出　　处：《石油天然气学报》2010年第3期228-231,共4页Journal of Oil and Gas Technology

基　　金：国家"973"规划项目(2005CB422104)

摘　　要：常规叠前时间偏移算法通常假设地下模型为各向同性介质或着层状各向同性介质,采用的走时算法通常为直射线或着弯曲射线理论,但是这种假设在各向异性剧烈的地区会造成走时计算不准确,从而造成动校正或着偏移成像的误差。研究首先探讨了各向异性介质情况下叠前时间偏移的走时计算方法,然后结合川东北复杂山地三维地震资料的构造特点,利用VTI介质的叠前时间偏移成像技术,探索出一种适合于复杂山地地震资料的叠前成像技术,可为以后类似地区的成像处理提供一种新的思路。The algorithms for conventional pre-stack time migration were based on the assumption that the in-situ model was isotropic or layered isotropic media,conventionally used travel-time algorithms were straight ray or bent ray theories,an approximation that was often not valid and thus could induce position errors on NMO or migration images.In this paper,the travel time algorithms were used in VTI media for pre-stack time migration,and in combination with the seismic data and structural characteristics from complex mountain areas in the northeast of Sichuan Province to find a new method of processing the imaging of seismic data from the complex mountain areas by using the technique of pre-stack time migration,provide a new a way for processing seismic data for the similar mountain areas.

关 键 词：三维地震 各向异性 叠前成像 复杂山地地震资料 

分 类 号：P631.44[天文地球—地质矿产勘探]