3D-VSP Multiple Velocity Analysis Method and Its Application
详细信息
- 责任者：Si Xingyan (State Key Lab of Oil and Gas Reservoir Geology and Exploitation ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Li Luming
- 刊名：Geophysical Prospecting for Petroleum
- 出版年：2012
- 卷期：51(1)
- 关键词：三维地震法 ; three-dimensional seismic methods ; 垂直地震剖面 ; vertical seismic profiles
- 页码：p.56-64,70
- 图表：13 illus., 2 tables, 14 refs.
- 分类号：1600
- issnNo：ISSN1000-1441
- isbnNo：CN32-1284/TE
摘要
Aiming at the 3D-VSP multiple velocity analysis problems,the velocity analysis method of 3D-VSP reflected P-wave and converted wave was stuied and realized,which can acquire the multiple velocity of the reflection layers below the receiving points and infill the defect of conventional VSP velocity analysis method to obtain the formation velocity above the receiving points only by first break of down-going wave.3D-VSP multiple velocity analysis includes non-zero-offset VSP multiple moveout equations,caculating the reflection point of reflected P-wave,iterative algorithm of converted point of reflected converted-wave,as well as the method to determine the S-wave velocity at the geophone location without S-wave first break data Based on the above methods,combined with batch processing and interactive method,we built the workflow and steps of 3D-VSP multiple velocity analysis.Moreover,the method was applied on theoretical VSP multiple data and actual 3D-VSP multiple data of deviated well.As a consequence,we obtained the multiple stack velocity model,multiple moveout gathers and stack profile which were coinciding with the time coordinates of surface seismic.The processing results proved the correctness and effectiveness of the method.
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