Application of the equivalent offset migration method in acoustic log reflection imaging  

等效偏移距偏移方法在声波反射成像测井中的应用研究(英文)

作　　者：张铁轩[1,2] 陶果[1,2] 李君君[1,2] 王兵[1,2] 王华[1,2] 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,中国北京102249 [2]北京市地球探测与信息技术重点实验室中国石油大学,中国北京102249

出　　处：《Applied Geophysics》2009年第4期303-310,393,共9页应用地球物理（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No.50674098);the 863 Program (Grant No.2006AA06Z207 & 2006AA06Z213);the 973 Program (Grant No.2007CB209601)

摘　　要：Borehole acoustic reflection logging can provide high resolution images of nearborehole geological structure. However, the conventional seismic migration and imaging methods are not effective because the reflected waves are interfered with the dominant borehole-guided modes and there are only eight receiving channels per shot available for stacking. In this paper, we apply an equivalent offset migration method based on wave scattering theory to process the acoustic reflection imaging log data from both numerical modeling and recorded field data. The result shows that, compared with the routine post-stack depth migration method, the equivalent offset migration method results in higher stack fold and is more effective for near-borehole structural imaging with low SNR acoustic reflection log data.声波反射成像测井能够获得井眼周围构造的重要信息,然而,由于接收到的反射波信号远小于井眼模式波、信噪比较低,且每次发射只有8道接收,因此应用常规的偏移成像处理方法成像效果不好。本文应用一种基于散射理论的等效偏移距偏移方法,对声波反射成像测井模拟数据及现场数据进行偏移处理。结果表明,与常规叠后深度偏移方法相比,等效偏移距方法可以有效提高覆盖次数,对于低信噪比的声波反射测井资料可以获得较好的井旁构造成像效果。

关 键 词：acoustic reflection logging common scatter point gather signal processing nearborehole structure imaging 

分 类 号：P631.814[天文地球—地质矿产勘探]