A Geometry optimization method based on Pre-stack migration effect analysis

Summary The results of migration imaging are influenced by acquisition geometry. In this paper, we put forward three geometric factors that affect the pre-stack migration effect, namely, trace density, the pre-stack migration effective coverage spectrum, and evenness. According to the influence of these factors on migration effects three corresponding evaluation indices are determined, viz. migration signal-tonoise (S/N) ratio, migration amplitude dispersion, and migration noise. This method adopts the relatively lower trace density with a relatively good migration effect index as a target to choose the geometry and realize the purpose for optimizing the acquisition scheme. This method takes into account the influence of migration noise as well as the acquisition footprint, which is favored to improve the fidelity of seismic acquisition.