加权抛物Radon变换叠加速度分析  

Stack velocity analysis by weighted parabolic radon transform approach

作　　者：王维红[1] 崔宝文[2] 林春华[1] 

机构地区：[1]中国石油大庆油田有限责任公司勘探开发研究院 [2]中国石油大庆油田有限责任公司油藏评价部

出　　处：《天然气工业》2009年第2期42-44,共3页Natural Gas Industry

基　　金：国家重点基础研究发展计划(973计划)“火山岩油气藏的形成机制与分布规律”(编号:2009CB219307)的资助

摘　　要：抛物Radon变换(PRT)是进行叠加速度分析较为有效的方法,当缺失原始地震记录道时,加权抛物Radon变换可改善正变换模型空间域的聚焦性。基于水平或中等倾角地层CMP道集时距曲线为双曲线的假设,给出了抛物Radon变换叠加速度求取的基本方法,同时给出加权PRT求解计算时权系数的选取原则。在数据域加权后,求解矩阵的Toeplitz结构并没有破坏,所以仍可用Levinson递推法来进行计算。加权抛物Radon变换叠加速度分析算法容易实现,且计算精度较高,能较有效地处理含多次波的地震剖面。Parabolic Radon transform(PRT) is one of effective approaches in stack velocity estimation.Weighted parabolic Radon transform(WPRT) can improve the focusing capability in PRT forward transform(model space) domain when the trace is missing in the original Common Midpoint(CMP) gather.The fundamentals of PRT are proposed based on the hypothesis of time-distance curve in CMP gather is hyperbolic when the subsurface is horizontal or has medium-dip structure,and also the method how to choose the weighted coefficients is given when solving the PRT equations.The Toeplitz structure is not destroyed when weight in data domain,therefore the Levinson recursion algorithm is still used to solve the forward PRT equations.The advantage of WPRT in stack velocity analysis is simple and highly accurate,and WPRT can also effectively process the seismic data with multiple reflection wave.

关 键 词：地震波 速度 叠加 系数 多次波 地震数据处理 

分 类 号：P631.44[天文地球—地质矿产勘探]