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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Modelagem 1D e 2,5D de dados do método CSEM marinho em meios com anisotropia transversal inclinada

SANTOS, Walleson Gomes dos 28 February 2014 (has links)
Submitted by Cleide Dantas (cleidedantas@ufpa.br) on 2014-05-28T15:36:55Z No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Tese_Modelagem1d2.5dDados.pdf: 6036247 bytes, checksum: 09857d990695852fd78d1d492571ec9e (MD5) / Rejected by Irvana Coutinho (irvana@ufpa.br), reason: Definir palavras-chave on 2014-08-06T16:23:28Z (GMT) / Submitted by Cleide Dantas (cleidedantas@ufpa.br) on 2014-08-27T14:13:55Z No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Tese_Modelagem1d2.5dDados.pdf: 6036247 bytes, checksum: 09857d990695852fd78d1d492571ec9e (MD5) / Approved for entry into archive by Irvana Coutinho (irvana@ufpa.br) on 2014-09-10T16:36:35Z (GMT) No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Tese_Modelagem1d2.5dDados.pdf: 6036247 bytes, checksum: 09857d990695852fd78d1d492571ec9e (MD5) / Made available in DSpace on 2014-09-10T16:36:35Z (GMT). No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Tese_Modelagem1d2.5dDados.pdf: 6036247 bytes, checksum: 09857d990695852fd78d1d492571ec9e (MD5) Previous issue date: 2014 / CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico / INCT/GP - Instituto Nacional de Ciência e Tecnologia de Geofísica do Petróleo / Neste trabalho apresentamos a solução do campo eletromagnético gerado por um dipolo elétrico horizontal em meios transversalmente isotrópicos com eixo de simetria vertical (TIV) e com eixo de simetria inclinado (TII). Para modelos unidimensionais, o campo eletromagnético foi obtido por duas metodologias distintas: (1) solução semi-analítica das equações de Maxwell com auxílio de potenciais vetores no caso TIV e (2) em modelos com anisotropia transversal inclinada o campo eletromagnético foi separado em primário e secundário, e então, o campo secundário foi calculado pelo método de elementos finitos no domínio (kx, ky, z) da transformada de Fourier. Para estruturas bidimensionais, foi aplicada a mesma metodologia usado nos modelos TII unidimensionais, onde o campo secundário foi calculado pelo método de elementos finitos no domínio (x, ky, z), da transformada de Fourier, com a utilização de malhas não estruturadas para discretização dos modelos. Estas respostas foram usados para avaliar os efeitos da anisotropia elétrica nos dados CSEM marinho 1D e 2,5D. / In this work I present the solution to the electromagnetic field generated by a horizontal electric dipole in transversally isotropic media with vertical (TIV) as well as inclined (TII) symmetry axis. In one-dimensional models the electromagnetic field was obtained with two distinct methods: (1) For the TIV case, I have written a semi-analytical solution to the Maxwell’s equations, by using a vector potential formulation; (2) For the TII case, the field was represented as the composition of primary and secondary fields, where primary fields are those found in an underlying isotropic layered medium, and the secondary field is calculated numerically via the finite element method in the spatial Fourier transform domain (kx, ky, z). This last methodology was also used to calculate the fields in two-dimensional structures, including inclined anisotropy in any region of the models. In this 2,5D case, I have applied the finite element method in the (x, ky, z) do main. Here I have used unstructured meshes to discretise the media, and parallel programming to solve the linear systems of equations. The responses were used to study the effects of electrical anisotropy in marine CSEM data.

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