Among the several problems in prospecting for oil and gas in the Amazon region, diabase sills occurring in the Amazonas Basin (Brazil), in spite of its role in the maturation of the organic matter that originated all hydrocarbons accumulations known so far, still poses difficulties for exploration seismic, causing anomalous seismic wave spreading, multiple reflactions and pull-up and pull-down effects, consequently rising the exploration risk. The present work then presents the results of the conventional and non-conventional seismic processing of the survey lines 0204-RL-0053, 0204-RL-0057 and 0204-RL-0058 acquired in the Amazonas Basin, with the objective of enhancing the seismic images of these cited sections. The conventional methods applied were CMP stacking, prestack time and depth migration, and the non-conventional CRS (common reflection surface) stacking technique. The results of both stacking methods (CMP and CRS) were compared to each other in order to show the efficiency of the CRS method in generating seismic images with superior resolution, when compared to the results of the efficient images generated by prestack Kirchhoff migration (in time or in depth). The gain in quality (i.e., resolution) of the final processed data using the CRS stacking was considered satisfactory when compared to conventional methods.
|
