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metadata.dc.type: | Artigo de Periódico |
Título : | Apparent resistivity and spectral induced polarization in the submarine environment |
Otros títulos : | Anais da Academia Brasileira de Ciências |
Autor : | Souza, Hercules de Sampaio, Edson E. S. |
metadata.dc.creator: | Souza, Hercules de Sampaio, Edson E. S. |
Resumen : | Relatively few investigations have employed electrical methods in the submarine environment, which may be promising for mineral deposits or threatened by environmental problems. We have measured the electric field using both disk and bar electrodes in the sea water at three different levels: sea surface, seven meters deep, and sea bottom at a depth of ten meters, employing a 2 m spacing dipole-dipole array with 7 array spacings of investigation, and 13 values of frequencies at steps of (2N hertz, N = -2, -1, 0, 1, 2,.....10). The measurement allowed the analysis of the electric field as a function of frequency and spacing, and of the spectral induced polarization. Modelling and interpretation of the apparent resistivity yielded a good fit with previous drilling data. Analysis of the spectrum of the complex apparent resistivity and the comparison with equivalent circuits, provided information about the grain size, the mineral composition and the major induced polarization phenomenon occurring below the sea. Therefore the result of the present research show the feasibility of measuring the variation of seawater resistivity in situ, as well as the resistivity of sea bottom sediments. |
Palabras clave : | Complex apparent resistivity Induced polarization Forward modeling Sea water |
Editorial : | Academia Brasileira de Ciências |
URI : | http://www.repositorio.ufba.br/ri/handle/ri/6525 |
Fecha de publicación : | sep-2001 |
Aparece en las colecciones: | Artigo Publicado em Periódico (IGEO) |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
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SOUZA, HERCULES DE.pdf | 631,84 kB | Adobe PDF | Visualizar/Abrir |
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