相位相关统计速度分析方法的改进  

Improved velocity analysis based on phase-correlation statistics and its application

作　　者：雷新民[1] 潘文勇[1] 雷新华[1] 张光学[2] 张新[1] 张雷[1] 

机构地区：[1]中国地质大学,北京100083 [2]广州海洋地质调查局,广东广州510760

出　　处：《石油地球物理勘探》2011年第3期401-406,500+326,共6页Oil Geophysical Prospecting

基　　金：国家"863"高技术研究发展计划资助项目(2005AA611050/02)(2006AA09A202-02-01)

摘　　要：在天然气水合物地震资料处理过程中,要求浅层的速度分辨率高,现有的速度分析方法大多存在一定的局限性,并且分辨率和精度远远不能满足天然气水合物矿体精细处理的要求。本文对传统的相位相关统计速度分析方法进行了改进,通过设置阈值对集中函数进行限定,使得R检验中对噪声和信号的相位概率分布的判别更加可靠。将改进的方法应用到南海北部海域的天然气水合物地震资料处理中,得到的速度谱的分辨率和精度更高,速度更容易拾取,并在处理后的叠加剖面上准确地识别了BSR,很好地满足了天然气水合物地震资料精细处理的要求。High velocity resolution for shallow strata is needed during gas hydrate seismic data processing.Present velocity analysis algorithms mostly have certain limits and could not meet the requirements of high resolution and high precision.We improve the statistical phase-correlation velocity analysis algorithm by setting threshold value to limit concentration functions,which enhances the reliability of discriminating phase probability distribution of noise and signal in 'R Test'.We apply the improved algorithm in gas hydrate seismic data processing of the northern part in the South China Sea.It is proved that the resolution and precision of velocity spectrum calculated by this algorithm are improved,which leads velocity picking more easily.BSR is identified clearly in the stack sections and the improved algorithm could meet the requirements of gas hydrate seismic data processing.

关 键 词：天然气水合物 速度分析 BSR 分辨率 

分 类 号：P631[天文地球—地质矿产勘探]