Spatial de-aliasing of the 3-D Kirchhoff DMO operator

摘要

A method is disclosed for processing seismic survey data to generate an unaliased 3-D DMO operator using two dimensional sampling theory to the spatial traverse of the operator as well as to the temporal axis. First a continuous DMO operator is generated along the line segment (10) connecting a source (5) and a receiver (R) directed at an arbitrary azimuth relative to a biaxial output grid. The operator is discretized at spaced-apart sample points (such as 16,18,20,30) along the DMO aperture segment (10), the spacing (D) being equal to or less than the output grid dimensions (dx,dy). An exponentially tapered sinc filter function is applied to the samples which are then interpolated onto the output grid.