Estudo Comparativo Entre Estereotomografia e Tomografia da Onda Nip: Aplicação a Dados Sintéticos

The determination of an accurate macro velocity model is a fundamental requirement for the seismic imaging. The pre-stack stereotomography and post-stack NIP wave tomography are powerful and very suggestive tools for this task. The former uses locally coherent events interpreted as primary reflections, which are associated to ray segments linked through the same reflection point in depth. In the latter, the seismic reflection event corresponds to a hypothetic NIP wave that is associated to a reflection point in depth. We determine the NIP wave attributes are by Common Reflection Surface (CRS) procedure. In this paper, we make a comparison between these methods, giving a brief review of the theoretical foundations, highlighting the main differences and applying these approaches to synthetic data. In order to evaluate the velocity models determined by these two approximations, we compare the Common Image Gathers (CIG) generated by applying the pre-stack Kirchhoff migration algorithm to the seismic data. The results show that both tomographic methods provide representative velocity models. In pre-stack data of laterally varying media, with a high signal-to-noise ratio, the stereotomography yields better estimates of the velocity model.