Programa de Pós-Graduação em Geofísica - CPGF/IG
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/2355
O Programa de Pós-Graduação em Geofísica da UFPA (CPGF) do Instituto de Geociências (IG) da Universidade Federal do Pará (UFPA). Foi o segundo no Brasil a formar recursos humanos em Geofísica em nível de pós-graduação stricto sensu. Criado em 1972, funcionou até 1992 junto com os Cursos de Pós-Graduação em Geoquímica e Geologia.
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Item Acesso aberto (Open Access) Migração pré-empilhamento Kirchhoff feixes gaussianos 2,5D nos domínios afastamento comum e ângulo-comum(Universidade Federal do Pará, 2012) COSTA, Manuel de Jesus dos Santos; CRUZ, João Carlos Ribeiro; http://lattes.cnpq.br/8498743497664023; CALLAPINO, German Garabito; http://lattes.cnpq.br/6064981270181319A Kirchhoff-type migration is considered in the geophysics literature as one of the most fundamental tools in seismic data processing, the base for solution of several imaging problems. In this respect, it must be considered its wide use and its successful history for the oil and gas industry, associated with its low computational cost and flexibility to deal with non-wavefield datasets when compared to other methods. However in 3D, even when compared to other existing and most effective methods, its computational cost and implementation is still considered high, due to several reasons: new acquisition technologies, data storage and burden, azimuth richness, etc. Thus the main objective of the present work is to implement and simulate migration results (i.e., images) with high signal-to-noise ratios and with a less computer burdens in 2.5D media, using the theoretical framework of Gaussian Beams (GBs). By considering one implementation of a superposition of GBs integral operator studied by Ferreira and Cruz (2009) and by the use of the stationary phase method (Bleistein, 2000), a new integral superposition migration operator using paraxial fields (i.e., GBs) was implemented and studied. Theoretically speaking, the present migration operator was inserted in the kernel of a conventional, 2.5D, true-amplitude, prestack Kirchhoff migration integral operator, thus defining a 2.5D prestack Kirchhoff-Gaussian Beam (KGB) migration operator. The present migration operator was later configured to hold commonoffset (CO) and common-angle (CA) seismic acquisition configurations. I remark that in the present thesis one flexibility of the GB migration operator was idealized in order to handle its effective application in more the one sorting configuration, i.e., common-offset and commonsource.Item Acesso aberto (Open Access) Rock physics attributes analysis for identification and characterization of fluid content at hydrocarbon reservoirs - revisiting the Viking Graben basin dataset(Universidade Federal do Pará, 2015-04-17) TERUYA MONROE, Jorge Antonio; FIGUEIREDO, José Jadsom Sampaio de; http://lattes.cnpq.br/1610827269025210In the characterization of hydrocarbon reservoir, most of methodologies used in rock physics or seismic reflection are based on the physical properties analysis of rocks which are associated to anomalous effects in seismic sections. These anomalies are, many often, associated to indicators of fluids (oil, gas and/or water) in the hydrocarbon reservoir. In this work, we perform a study in order to characterize a hydrocarbon reservoir at north Viking Graben region, in the North Sea. In addition to the seismic data, well-logs from two locations (wells A e B) were also used in our analysis. However, in our data set analysis, beyond to perform AVO analysis, Vp/Vs versus impedance (Ip) and Vp/Vs - Φ we applied the trend angle methodology and well-logs data set analysis as well as Gassmann fluid substitution. Through AVO analysis in the re-processing of Viking Graben seismic data set, where found three anomalous zones with a high potential for the presence of fluids (gas/oil). Thus using templates of rock-physics and the analysis by attributes (trend angle) to classifying the fluids and determinate the possibility of gas-sand that are present at wells A and B.