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《Chinese Journal of Geophysics》 2009-07
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VSP wavefield separation using local slopes attribute

DU Jing~(1,2),WANG Shang-Xu~1,LIU Guo Chang~(1,4),LIU Yang~(3,4)1 School of Resources and Information,China University of Petroleum Beijing,Beijing 102249,China2 Gubkin Russian State University of Oil and Gas,Moscow 119991,Russia3 College of Geo-Exploration Science and Technology,Jilin University,Changchun 1 30026,China4 Bureau of Economic Geology,University of Texas at Austin,Austin 78713,USA  
Based on difference between upgoing and downgoing wavefields in verticalseismic profiling (VSP) data,a new method to separate upgoing and downgoing wavefields using local event slopes attribute is developed.In this method,we first use Fourier Transform to obtain initially separated wavefields,and then use plane wave destruction technology to estimate local event slopes of initially separated wavefields.Finally,original VSP data is separated on the basis of local event slopes.Our proposed method,which is a kind of optimization approach in time domain,doesn't have taper effects that result from window filter band and attenuates artifacts. Results of synthetic and field data examples show that,compared with conventional method, separated wavefields using local slopes are clean and amplitudes are maintained.The interference between upgoing and downgoing wavefields can be eliminated better.
【Fund】: 中国石化集团总公司;; 国家留学基金委(2007U44003)资助.
【CateGory Index】: P631.4
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