VSP normal moveout stretch

Abstract

The vertical seismic profiling, common depth‐point (VSPCDP) transformation is a technique used to image the reflected waves in an offset VSP. This coordinate transformation procedure maps reflection amplitudes from receiver depth and reflection times to lateral offset and reflector depth (Wyatt and Wyatt, 1981). The process involves the application of moveout correction followed by stacking. This moveout correction results in a distortion of the original waveform and a smear of the reflection event that consequently degrades the lateral resolution of the transformation (Owusu, 1991). Therefore, to determine the optimum processing parameters for the transformation we need to understand the effects of the VSP moveout stretch.