Simplified Numerical Models for the Generation of Synthetic Reflection Profiling Seismograms and Synthetic Reflection/Refraction Seismograms

摘要

Two numerical models were developed which generate synthetic seismograms in formats similar to those of records obtained in field exploration. The models solve the hyperbolic wave equations in one and two dimensions by finite difference approximations in initially undeformed solution domains of transversely-isotropic layered media subjected to a time varying, dilatational forcing stress applied at the surface. A velocity attenuation term was included in the models to inhibit strong boundary reflections. The one-dimensional model produces synthetic reflection profiling seismograms for arbitrary horizontal or dipping layers. The two-dimensional model generates synthetic reflection/refraction seismograms for horizontal layered media with arbitrary distribution of wave velocities, Poisson's ratio and density. Several sample records were produced for some representative velocity structures. The synthetic seismograms were interpreted and gross correlation was carried out as if they were actual field records. (Author)