复杂条件下的深度成像技术  

Depth imaging technique in complex conditions

作　　者：方伍宝[1] 孙建国[2] 

机构地区：[1]中国石化石油勘探开发研究院南京石油物探研究所,江苏南京210014 [2]中国石化石油勘探开发研究院,北京100083

出　　处：《石油与天然气地质》2005年第6期816-822,共7页Oil & Gas Geology

基　　金："863"项目"油气地震勘探应用网络研究"(2004AA104350)

摘　　要：基于波动方程的叠前深度偏移方法能在复杂介质条件下精确描述波场,且能高精度成像。此方法包括波场向上和向下延拓进行基准面校正、基于深度域共成像道集的成像点速度模型修正技术和应用成像条件前后作偏移数据内插的偏移反假频技术等核心技术。经实际应用,基于波动方程的叠前深度偏移技术在波组的分辨率、断层的清晰度、深部目的层的成像精度以及振幅的保持等方面都明显优于传统方法。Wave equation-based prestack depth migration technique can accurately describe the wave field in complex media conditions and perform high resolution imaging. Its key techniques include datum correction through upward and downward continuations of wave field, velocity model modification of imaging points based on common imaging gather in depth domain, and migration anti-alias filter through interpolation of migration data before and after application of imaging condition equation. Practical application shows that prestack depth migration technique based on wave equation is obviously better than conventional techniques in respects of resolution of wave-groups, detail of fault, imaging accuracy of deep target and preservation of amplitude, etc.

关 键 词：波场延拓 基准面校正 速度模型 反假频 深度成像技术 

分 类 号：TE19[石油与天然气工程—油气勘探]