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《Geophysical Prospecting for Petroleum》 2011-02
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Synthesized plane wave pre-stack depth migration from rugged surface

Yang Haisheng.Wang Bijin.Chen Yuming.Liu Lin,Zheng Aip- ing,Liu Qifeng,Li Wei Exploration and Development Institute,Jianghan Oilfield Company,SINOPEC,Qianjiang 433100,China  
Pre-stack depth migration by wavefield continuation has higher precision than Kirchhoff integration method,but it has larger computation amount.Plane wave pre-stack depth migration,has higher computation efficiency than in shot domain,the two has almost the same imaging precision,but which is only suitable to horizontal surface. Therefore,we introduced a synthesized plane wave pre-stack depth migration method from rugged surface,which takes the plane of highest point of seismic array as the starting surface of wavefield continuation,the observation data(shot points or receiving points) of seismic array from rugged surface was downgoing continued to the horizontal datum of the lowest point at surface to realize datum correction of wave equation.On the plane,p transform was applied to composite all shot points into source of plane wave and decompose all shot records into plane wave records.Then,dowgoing-wave equation and upgoing-wave equation was separately used to extrapolate source wavefield and record wavefield of plane wave along depth direction.Thirdly,wavefield was correlated and accumulated at every depth to gain the imaging wavefield of the depth and obtain common sub-angle plane wave gather.Finally* all the migration gathers of plane wave with different angles were stacked by coordi- nate to obtain synthesized plane wave pre-stack depth migration result from rugged surface.The testing of numerical model of Longju area and actual data processing of HNT12 line in Sichuan Basin shows that the result of pre-stack depth migration of synthesis plane wave and in shot domain is almost the same,but the former one has higher computation efficiency and is suitable to rugged surface.
【CateGory Index】: P631.4
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