Processamento sísmico CMP e CRS de dados sintéticos acústicos e elásticos representativos das bacias paleozóicas da região Amazônica

Abstract

Among the several difficulties found in oil and gas exploration in the Amazon area, the existence of diabase sills, although important to the process of maturation of organic matter in all Brazilian Paleozoic basins, turns difficult the seismic exploration. The diabase disturbs the seismic signal, generating multiple reflections and scathering. With the purpose of understanding the seismic wave propagation and, mainly, the difficulties found by the seismic imaging methods in these complex geological settings, in this work it is presented the results of acoustic and elastic seismic modeling in synthetics models of the Amazonas and Solimões Basin, using finite-differences techniques. I present the seismic processing of this data set by the Common Midpoint (CMP) and Common Reflection Surface (CRS) stacking methods, and the pos-stack depth migration with split-step method. The results of stacking with CRS method show that both acoustic and elastic data has a better signal-noise ratio and lateral continuity of the reflectors when compared with the results of CMP stacking. The interpretative analyzes of stacked and migrated sections show that reflection events located on the top of models (in time until 0.7sec. and in depth until 1.200 meters) present apparently better resolution, but the botton of models has not been satisfactorily imaged by the occurrence of multiple reflections overlapped to primary reflections.