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).
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Item Acesso aberto (Open Access) Modelagem numérica de dados MCSEM 2.5-D(Universidade Federal do Pará, 2012-04-20) SILVA, Hilton Farias da; SILVA, Marcos Welby Correa; http://lattes.cnpq.br/3213216758254128This work deals with the implementation of numerical 2.5-D Marine Controlled Source Electromagnetic (MCSEM) modeling applied to hydrocarbon exploration in stratified environment. In the mathematical formulation the fields were assumed to have two parts: the primary and the secondary ones. The first uses of Schelkunoff potentials in its formulation and they were employed in both (x; ky; z; !) and (x; y; z; !) domains. The secondary fields are solved in the frequency domain space (x; ky; z) by finite element method. With a Inverse Fourier transform, the secondary fields were taken in the domain (x; y; z). From the total field, we can show the influence of an oil reservoir in a stratified environment and its sensitivity to the lateral extension of a hydrocarbon reservoir.Item Acesso aberto (Open Access) Modelagem unidimensional de dados do método MCSEM com variação na resistividade da água do mar e na orientação dos sensores(Universidade Federal do Pará, 2007-06-22) LUZ, Edelson da Cruz; RÉGIS, Cícero Roberto Teixeira; http://lattes.cnpq.br/7340569532034401The Marine Controlled Source ElectroMagnetic (MCSEM) is a new geophysical method that is very promising in the detection of resistive layers in the sediments under the oceanic floor, a useful information for the oil industry. In this work we model MCSEM data including variations in the resistivity of the ocean water. Such variations can arise from the influence of marine currents, temperature gradients or any other source of influence on the water salinity. We observe that the data from this method are significantly affected by those variations.We also simulate the random positioning of the receivers when deployed to the sea botton, our results show a strong decline in the amplitude of the signal when the receivers are located at a certain distance from the ideal array line.