Wavefield continuation datuming using a near surface model  

作　　者：Cui Xingfu Li Hongbing Hu Ying Liang Hong Qi Li 

机构地区：[1]Geophysical Technology Department, Research Institute of Petroleum Exploration ＆ Development, PetroChina. Beijing（100083）

出　　处：《Applied Geophysics》2007年第2期94-100,共7页应用地球物理（英文版）

基　　金：the National Development and Innovation Committee Program (2005) 2372;the National High-tech R&D Program (863 Program) 2006AA06Z241 of China;Youth Innovation Fund of CNPC’ Prestack Imaging Integral Study for Complex near Surface.

摘　　要：When topography and low velocity zone differences vary greatly, conventional vertical static time shifts will cause wavefield distortion and influence wave equation seismic imaging for seismic data acquired on a complex near surface. In this paper, we propose an approach to datum correction that combines a joint tomography inversion with wavefield continuation to solve the static problem for seismic data on rugged acquisition topography. First, the near surface model is obtained by refracted wave tomography inversion. Second, the wavefield of sources and receivers are continued downward and upward to accomplish datum correction starting from a flat surface and locating the datum above topography. Based on the reciprocal theorem, Huygens＇ and Fresnel principles, the location of sources and receivers, and regarding the recorded data on the surface as a secondary emission, the sources and receivers are upward-continued to the datum above topography respectively. Thus, the datum correction using joint tomography inversion and wavefield continuation with the condition of a complex near surface is accomplished.当地形学和低速度地区差别极大地变化时，常规垂直静态的时间移动将为在复杂近的表面上获得的地震数据引起波浪地失真和影响波浪方程地震成像。在这篇论文，我们建议一条途径到把联合断层摄影术倒置与波浪地继续相结合在崎岖获得地形学上为地震数据解决静态的问题的资料修正。首先，近的表面模型被测定波浪断层摄影术倒置获得。第二，来源和接收装置的波浪地向下并且向上被继续完成从扁平的表面开始并且在地形学上面定位资料的资料修正。基于相互的定理， Huygen 的并且夫累Ｘ尔原则，来源和接收装置的地点，并且关于是的表面上的记录数据，第二等的排出物，来源和接收装置分别地对在地形学上面的资料向上继续。因此，与复杂近的表面的条件使用联合断层摄影术倒置和波浪地继续的资料修正被完成。

关 键 词：Complex near surface tomography inversion wavefield continuation datum correction. 

分 类 号：P22[天文地球—大地测量学与测量工程]