【摘要】 当地形起伏剧烈、地表高程差较大时,采用传统的垂直静校正方法会使地震波场发生扭曲。基于单平方根算子的波动方程基准面静校正方法,将起伏地表的叠前数据通过波场外推到高于地形线的某一基准面上,在基准面与地形线之间填充一套新地层,填充层的速度选为接近于直达波;从地形线以下的某深度出发,在共炮点集中,根据菲涅尔原理以及检波点的空间位置,以检波点接收的地震数据为二次震源,通过上行波正向外推将检波点延拓到基准面上;再根据炮点、检波点互易原理,通过下行波反向外推将炮点延拓到基准面上。数值模拟结果证明,该方法正确有效,有利于后续的常规处理和叠前成像。图7参10更多还原

【Abstract】 When topography and elevation differences vary between stations,conventional vertical static time shift will cause wavefield distortion.A novel approach of wave equation datum plane correction based on the single square-root operator is proposed: the seismic data on rugged acquisition topography is continued up to the datum plane above topography starting from some depth below near surface,by filling an additional layer between datum plane and topography with the velocity close to that of the first arrival wave.In common shot gathers,based on the Fresnel Principle and location of receivers,regarding the recorded data on real surface as a secondary emission the receivers are continued to the final datum plane by the forward propagation of upcoming wave.As a cascade step,all sources are continued up to the final datum plane in common receiver gathers,by the inverse propagation of down going wave based on the reciprocal principle of source and receiver.Numerical experiment results indicate that the method is correct and efficient,and is good for the subsequent seismic data processing.更多还原