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《Oil Geophysical Prospecting》 2001-04
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Generalized high-order screen method for pre-stack depth migration by double-square-root

Sun Peiyong,Zhang Shulun (Department of Applic ation Mathematics,Dalian Science and Engineering University,Dalian City,Liaoning Province,116024,China)  
Pre-stack depth migration technique can be realized either in shotpoint receiver domain or in CMP offs et domain.The predecessors popularized split step extrapolation operator into DSR pre stack migration based on phase shift in CMP offset domain.The simple a nd high efficient split-step DSR pre-stack depth migration has been resulted from correction for errors produced by phase shift extrapolation in constant ve locity using time shift quality only once within each step length of downward c ontinued wave field,but this method has a poor precision. Based on non station ary phase shift formula for wave field extrapolation and through introducing re ference velocity,the paper deduced a new high order screen approximate formula conducted wave field continuation in CMP offset domain,using Taylor's series ex tension for two square roots in DSR and suitable mathematical process.The formul a can directly conducted continuation to pre stack wave field in CMP-offset n high efficiency.Through increasing order of screen,the precision of pre stack depth migration in a condition of strong l ateral changes in velocity has been improved.The method is extension of pre sta ck depth migration by split step DSR.The test results from theoretical model an d real data showed that the method is effective and practical.
【CateGory Index】: P631.4
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