2019-03-212019-03-212009CONCEIÇÃO, Miquéias Silva da. Simulação sísmica de grande abertura baseada no método da refletividade. Orientador: Lourenildo Williame Barbosa Leite. 2009. 72 f. Trabalho de Curso (Bacharelado em Geofísica) – Faculdade de Geofísica, Instituto de Geociências , Universidade Federal do Pará, Belém, 2009. Disponível em:. http://bdm.ufpa.br/jspui/handle/prefix/1224. Acesso em:.http://bdm.ufpa.br/jspui/handle/prefix/1224The wide angle seismic considers reflection paths and of refraction with the image objective the general properties of a sedimentary basin. In these experiments, the attenuation of amplitudes by spherical divergence and by conversion of energy P-SV-SH is significant. The measurement of physical parameters of reservoirs is constitutes of great importance for the hydrocarbons detection. The obtaining of these parameters is accomplished through amplitudes analysis with the determination of the reflection coefficients. For this, it is necessary the application of special techniques of processing capable to correct effects of spherical divergence. A problem that can be established is the analysis of the effects important for the reduction of amplitudes due to geometric spreading and the loss by transmissivity. The difficulty in separating these two phenomena, takes to dynamic correction to be applied to real data in geometric spreading only. A more physical answer can give better subsidy to the form of correction of amplitudes. The techniques used in the present work are related to the reflectivity method. The quality of the seismic/seismological observations is directly dependent of the amplitudes reduction and on the presence of noises, and the form of attenuation of energy on the source is controlled mainly by the spherical divergence. The general method of analysis of the seismic observations is formed by premises, how a first premise is that the theoretical models contemplate separately the effects of geometric dispersal, of transmissivity and of porosity. A second premise is that the seismic sources are limited to be punctual and symmetrical. A third premise describes the wave form, where it is convenient the spherical waves and them impulsive plane wave. A fourth premise limits the medium too horizontally and stratified, formed by homogeneous layers and isotropic. A fifth premise admits application of the ray theory based on the iconal and transport equations, and/or to the complete solution based on the wave equation A sixth premise limits the analysis to the condition of acoustic waves. The crustal segments simulated in this study models a Brazilian sedimentary basins of interest for exploration of petroleum that are characterized by the presence of diabase sills. For some sedimentary basins, the geologists consider the sills as directly related to the generation and accumulation of the hydrocarbons, the Tacutu Basin was used as a reference model in this work. The justification of the present work is the simulation of data regarding areas of interest of the projects for development and support of the PROSIS. The model is a sedimentary basin where one can see events of reflection pre-critic, critic and post-critic. The medium is simulated by flat-horizontal, homogeneous and isotropic layers. The reflectivity method is a form of solution of the wave equation for this model, what turns possible an understanding of the problem under study. To arrive at the obtained results, synthetic seismograms were calculated with the program P-SV-SH.Acesso AbertoProspecção SísmicaProspecção - Métodos geofísicosRio Tacutu - RRCNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOFISICATrabalho de Curso - Graduação - Monografia