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9th International Congress of the Brazilian Geophysical Society
- Conference date: 11 Sep 2005 - 14 Sep 2005
- Location: Salvador, Bahia, Brazil
- Published: 11 September 2005
21 - 40 of 462 results
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Well Log Vertical Resolution Enhancement by Recurrent Neural Network
Authors A. de Lima Ruéla, A.I. Fischetti and A. AndradeThe reevaluation of mature or small oil fields, where there are only conventional well log data or the use of new logging technologies have not economic viability motivate us to take a new look in log vertical resolution enhancement. We talk about the paradox between depth of investigation and the vertical resolution of a logging tool.
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Three-Dimensional Numerical Simulation of Induction Loggings
Authors A. Carrasco and A. CarrasquillaThe electromagnetic induction well log method is one of the more utilized geophysical logs in oil industry, aiming to obtain petrophysical informations regarding geological formations along the well.
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Aplicação de Modelagem 3D na Perfilagem de Indução em Turbiditos da Bacia de Almada - Ba
Authors K. Tomaso, A. Carrasco and A. CarrasquillaInduction logging is one of the most important geophysical methods used in the petroleum industry. In this work, we employ a three dimensional algorithm to interpret induction well log data from Almada Basin (Bahia – Brazil).
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Associação de Estatística Multivariada com Redes Neurais e Lógica Fuzzy para Identificação automática de litologias usando perfis de poço do Campo de Namorado na Bacia de Campos, Brasil
Authors R.T. Flexa, A.A.G. Carrasquilla and J. da Conceição da SilvaIn search of the petroleum reservoir characterization, the first task executed is the identification of lithologies crossed by the well, which may be achieved through the analysis of core sampling. However, this method is considered expensive and lengthy. Another way is through the interpretation of well logs, which are calibrated with some data from core samples and then extrapolated to the entire field. Although the interpretation using well logs is considered more economic, in some cases, due to the mineralogical complexity of these rocks, satisfactory results are not attained. This fact is because of the use of conventional statistical or mathematical algorithms.
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Multicomponent offset VSP to detect gas reservoirs
More LessThe occurrence of gas filled, complex reservoirs, in Miranga field on Reconcavo onshore basin was the motivation to evaluate the seismic response of borehole seismic in that area.
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Response of the sonic dipole tool in low compacted rocks in vertical wells
More LessThe correct acquisition of shear wave slowness through the flexural mode record with dipole source tool involves several requisites that are , barely, encountered in real conditions.
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Fenômenos de Relaxação, Difusão e Convecção em Medidas de Ressonância Magnética Nuclear
More LessSeveral important reservoir parameters such as permeability and irreducible water saturation are difficult to measure by logs. Nuclear resonance involving free precession of the total magnetic momentum as described by the CPMG pulse sequence has long promised to measure these parameters.
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Resultados do primeiro levantamento 3D-VSP da PETROBRAS: Comparação entre ondas compressionais (p) e cizalhantes (S)
Authors F.A.F. Gomes, M.C. Schinelli and O.K. FilhoO trabalho descreve as etapas envolvidas no projeto pioneiro 3D-VSP, registrado pela PETROBRAS na Bacia Potiguar. A aquisição foi realizada em agosto/setembro do ano passado e o levantamento foi patrocinado pelo PRAVAP (Programa de Recuperaçao Avançada de Petróleo) e pela UN-RNCE (Unidade de negócio Rio Grande do Norte Ceará).
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Modelo Fuzzy Para Prediçao de Porosidade e Permeabilidade via Perfis Convencionais de Poço do Campo de Namorado – Bacia de Campos
Authors R.F. Mimbela and J. da Conceição da SilvaThe well logs have a great applicability in the search and evaluation of hydrocarbon. In this work we calculate porosities of the Namorado field with help of the “Fuzzy Rule”.
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Semi-analytical logs of electrical focusing tools in basic subsurface models
By K. CozzolinoThis work presents a procedure to obtain synthetic logs for the electrical tools as LLS, LLD and LL7 in subsurface models: plane-parallel layers and cylindrical shells. The synthetic focusing used to acquire semi-analytical logs is based on the superposition principle applied to all transmitter-receiver pair of electrodes. Forward models can be created for investigations of real electrical resistivity data trough inversion procedures. Also, correction charts can be constructed for these tools or any other similar configuration.
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Estudos sobre a função objetivo na estimativa de parâmetros elásticos a partir da inversão das amplitudes da onda P refletida acima do ângulo crítico em levantamentos de sísmica rasa
Authors M.V.A.G. de Lima, L.A. Diogo and R.L. PradoWe propose to implement an inversion algorithm to estimate shear wave velocity (Vs) and density (ρ) above and below the reflecting interface, extracting the information contained in phase changes in the compressional wave pulse reflected at post-critical angles of incidence.
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Utilização de Potencial Espontâneo e Caminhamento Elétrico para detecção de vazamentos em barragem
Authors J.E. da Silva, V.R. Elis, F.Y. Hiodo and E. Gomes de OliveiraGeohysical methods like dipole-dipole geoelectric profiling, and spontaneous potential measurements with non polarizable electrodes were used to identify possible zones of leakage or infiltration by water, occurring in dam structure of artificial lake in Itatiba city-SP. Electroresistivity profiling in dipole-dipole array, and spontaneous potential determinations in gradient mode allowed to identify anomalous zones with low values of resistivity and spontaneous potentials.
Resistivity data processing by an inversion software RES2Dinv provided true electrical resistivity values in five levels of investigation depth.
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Estudo da compactação do solo por meio de ensaios geotécnicos e de métodos geofísicos
Authors C.T.C. Nascimento, P.G.O. Passos, M.M. Farias, R.P. Cunha and A.C.B. PiresThe main objective of this work is to investigate the effect
of sand-gravel compaction piles on the behavior of loose
sand deposits. Reduced model tests were carried out on
an artificial sand deposit filling a trench 1.5 m wide, 3.0 m
long and 2.5 m deep, excavated in a clay rich soil. In situ
geotechnical tests and DC electrical resistivity
measurements were carried out before and after the
construction of compaction piles, in order to characterize
the changes in the sand deposit. Conductivity anomalies
were observed in the position of the compaction piles with
better performance. These anomalies are caused by the
introduction of the sand-gravel compaction piles and
possibly more related to the mineralogical composition of
these piles than compaction itself.
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Real Time Workflows for More Efficient and Safer Deepwater Drilling Operations
By B. ChmelaReal Time Operations Centers and Collaboration Rooms allow professionals the ability to create the perception of being on the rig or platform even when they are back in the office. Using leading edge high definition visualization technology and new software and standards for data transfer, new workflows have been developed to make upstream operations much more efficient and safer.
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Some Preliminary interpretation on the Marine Controlled Source Electromagnetic<br>(MCSEM) data acquired on Campos Basin, Brazil
Authors M.P.P. Buonora, R. Reddig, W. Heelan, J.D. Schofield, A. Zerilli and T. LabruzzoThe Campos Basin MCSEM data was acquired on a rectangular grid with line spacing of approximately 5 km. Three component electrical field as well as two component magnetic fields were recorded, from which the in-line electrical horizontal fields at each receiver position were processed to yield ratio maps of that field to a reference remote station.
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Contribution of the relative velocity between source and receivers to primary electromagnetic fields in the sea
More LessThe analysis of primary EM fields caused by a finite length line source below the sea level is important for submarine applied geophysics as well as for protecting ships from the threat of sea mines in both shallow and deep sea water environments. The surveys employ a source moving with a constant velocity whereas the receivers remain fixed at the sea floor. So an accurate determination of the primary field taking into account the relative velocity between the source and the receivers is necessary in order to optimize
the interpretation of both TDEM and FDEM data.
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Novas Técnicas Geoelétricas Otimizadas para Avaliar Danos Hidrológicos em Ambientes Subterrâneos
Authors O.A.L. de Lima and P. de A. PereiraIn this paper we propose two new geoelectrical techniques designed to improve the structural delineation of underground contamination plumes, using multi-electrode arrays. These techniques were tested in a selected area surrounding the garbage landfill of Alagoinhas, Bahia.
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Interpretação de dados de polarização elétrica induzida obtidos por um sistema eletromagnético a multi-freqüência na Fazenda Bela Vista, município de Jaguarari, Bahia, Brasil
Authors C.A. Dias, M.M.V. Barbosa and T.S. VieiraThis work presents the pseudo-sections of IP from a
survey carried out for the first time using a non-grounded
multi-frequency electromagnetic system, conceived by
Dias (1968). The induced electrical polarization data were
obtained from an anomaly in the Bela Vista Farm in
Jaguarari District (Bahia state, Brazil). The produced
sections permit to detect the mentioned polarizable
bodies and do good correlation with data taken using
traditional methods of geophysical prospecting.
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Modelagem geométrica de dados geoelétricos
Authors A.F. de Campos, A. Rigoti, S.P. Rostirolla and M.K. BartoszeckDesign the 3D geometry of the structural model from electrical profiles is the main objective of this work. From a electrical array of lines, align transversal to predominant tectonic structure directions, results interpretation of some fault planes. The continuity varies along the profile interpretation, equal to field work informations. Was introduced a horizon in the base of the resistivity layer, and this traces are transformed to a surface with the fault planes influence. The result was a 3D geometrical model, with fault discontinuity inside, based in geoeletrical interpretations of resistivity sections.
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Estrutura Elétrica da Contaminação Hídrica sob os Depósitos de Resíduos Sólidos Urbanos do Município de Alagoinhas, Bahia
Authors P. de A. Pereira, O.A.L. de Lima and M.J.M. do RêgoThis paper discusses the successful results of a geoelectrical survey conducted around the actual sanitary landfill of Alagoinhas, Bahia. Forty-nine Schlumberger IP-resistivity soundings were made in regularly distributed centers in the area to allow a good three-dimensional representation of its underground geohydrology. Apparent resistivity maps and cross-section were used to depict and correlate the geoelectrical sounding results.
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