Comparison on finite-difference and common focusing point redatuming technique for hard rock seismic

Abstract

As mineral deposits are bounded to hard rock environment, seismic method suffers from near surface complex wave propagation effect. We applied and compared two wave extrapolation redatuming techniques, namely finite-difference and common focus point, methods with the aim to improve imaging by removing propagation footprints form near surface. Redatuming method relocates the sources and receivers from the surface to any datum in the subsurface while removing any propagation effect between the new datum and the surface. This study uses synthetic data obtained from a velocity model with rough undulating shallow boundary to introduce complex propagation effects. Under certain conditions, the common focus point method can be used instead of finite-difference method to decrease computational time. Both method produce an accurate imaging of the target reflector however the finite-difference method does produce more synthetic noise.