Dissertações em Geofísica (Mestrado) - CPGF/IG
URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/4993
O Mestrado Acadêmico pertente a o Programa de Pós-Graduação em Geofísica (CPGF) do Instituto de Geociências (IG) da Universidade Federal do Pará (UFPA).
Navegar
Navegando Dissertações em Geofísica (Mestrado) - CPGF/IG por Linha de Pesquisa "INVERSÃO E IMAGEAMENTO ATRAVÉS DE MÉTODOS ACÚSTICOS"
Agora exibindo 1 - 2 de 2
- Resultados por página
- Opções de Ordenação
Item Acesso aberto (Open Access) Aplicação de Well-Tie no imageamento de uma área da bacia Tumbes-progresso(Universidade Federal do Pará, 2014-08-29) CHAGAS, Tiago Paulo Câncio das; SILVA, Carolina Barros da; http://lattes.cnpq.br/5306784916926352; GOMES, Ellen de Nazaré Souza; http://lattes.cnpq.br/1134403454849660Geological areas with large lateral velocity variations, such as in areas with faults and salt domes are complex areas, in general, seismic imaging time is limited. In these cases, the seismic imaging depth can provide better results. However, a velocity model is needed in depth with precision, which is not an easy task. An alternative to estimate the depth velocity model is provided by Well-tie technique. With the calibration of the synthetic trace data obtained from wells, seismic section with the depth map of velocity can be obtained through the time-depth curve. In this study, we used the Well-Tie to improve the model of RMS velocity obtained from the processing of seismic data. The updated velocity model was converted to depth and used to generate an in depth migrated seismic image of a region of Tumbes Basin-Progress.Item Acesso aberto (Open Access) Seismic physical modeling based on the physical similitudes: application in isotropic media(Universidade Federal do Pará, 2015-12-02) SANTOS, Léo Kirchhof; FIGUEIREDO, José Jadsom Sampaio de; http://lattes.cnpq.br/1610827269025210Throughout the decades seismic physical modeling has been used to help the geophysicists to understand the phenomena related to the elastic wave propagation on isotropic and anisotropic media. Most of the published works related to physical modeling, use physical similitudes between model and field (geological environment) only in the geometric, and sometimes, in the kinematics sense. The dynamic similitude is approximately or, most of the time, not obeyed due to the difficulty to reproduce, in laboratory, the forces and tensions that exist inside the earth when elastic waves propagate. In this work, an analytical expression for dynamic similitude in isotropic media in the sense of dynamic stress (stress due wave propagation) was derived. The resulting expression for dynamic similitude shows that this type of similitude has multiple solutions in context of dynamic stress (non-unicity problem). However, the regularization of this problem can be reached by controlling porosity and clay content. Ultrassonic measurements(elastic) as well as petrophysical measurements (density, porosity and clay content) in synthetic sandstone samples show how difficult it is to reproduce in the laboratory the three physical similarities studied in this work. Other important result of our analysis (from the kinematic similitude), is the achievement of an expression that relates the seismic frequency source with ultrasonic sources which are used in laboratory.