International Petroleum Technology Conference, 2013
The main objective of this project was to evaluate the ability to derive petrophysical properties... more The main objective of this project was to evaluate the ability to derive petrophysical properties like porosity from pre-stack seismic data in a carbonate environment. We apply a direct petrophysical inversion technique to an offshore carbonate reservoir. Starting from an initial geological model in depth and a number of carefully conditioned seismic angle stacks, we derive a detailed 3-D model of the porosity and hydrocarbon saturation matching the observed seismic data. We use a well-calibrated Petro-Elastic Model (PEM) to link the petrophysical properties to the seismic velocities. We compare inversion results obtained using the Xu-Payne and T-matrix PEMs which both account for carbonate pore geometry, lithology, porosity and fluid content but have different elastic sensitivity to fluid saturations. The inverted results provide detailed images of the spatial variations of porosity and fluid content across the reservoir interval. Obtaining estimates of absolute saturations values is more difficult, as saturation estimation is strongly dependent on the choice of PEM. Introduction Carbonate reservoirs are notoriously heterogeneous. Seismic inversion is therefore needed to help estimate the spatial variations of rock type, porosity and fluid content in between the available wells. We present the results of a direct inversion of porosity and saturations from seismic pre-stack data over an offshore carbonate reservoir.
Novas tecnologias de exploracăo de petroleo voltam-se ao estudo detalhado de reservatorios e ŕ pr... more Novas tecnologias de exploracăo de petroleo voltam-se ao estudo detalhado de reservatorios e ŕ procura de indicadores diretos de hidrocarbonetos. (DHIs). As relacőes de Gassmann e de Biot-Geerstsma săo usualmente utilizadas buscando uma melhor compreensăo de fenomenos como bright-spots, crescimento de amplitudes com o offset e reflexőes de contato de fluidos, entre outros.
Several Brazilian offshore fields are build of unconsolidated and complex sandstones. This fact c... more Several Brazilian offshore fields are build of unconsolidated and complex sandstones. This fact cause many problems in some logs, mainly in velocity logs. As seismic and AVO modeling need these logs as input, some times it is necessary to do corrections in these logs, that is the main goal of this work. In order to do these corrections it was necessary to make log velocities calibration using laboratory measurements (compressional and shear velocities, density and porosity), fluid substitution methods and logs data. From the results it is possible to see that a log Vp correction between 10% and 15% it is necessary. This correction is obvious when we compare these results with a well without problems like acquisition and interpretation.
D004 SEISMIC FACIES INTERPRETATION IN A TURBIDITIC ENVIRONMENT FROM PRE-STACK DATA: A CASE STUDY ... more D004 SEISMIC FACIES INTERPRETATION IN A TURBIDITIC ENVIRONMENT FROM PRE-STACK DATA: A CASE STUDY Summary 1 Seismic facies analysis aims at interpreting a set of features measured locally in reservoirs in terms of qualitative properties. This paper presents a real-case study from a deep-offshore field located in Brazil. The aim of this work is to interpret pre-stack inversion results (P and S-Impedance cubes) obtained by joint pre-stack stratigraphic inversion in terms of seismic facies. This study tackles some issues such as well-to-seismic data integration upscaling of lithofacies and facies definition and identification in a real world. Introduction In the recent
5th International Congress of the Brazilian Geophysical Society, 1997
Reservatorios de oleos pesados ou parafinicos em terra podem apresentar relacőes custo/beneficio ... more Reservatorios de oleos pesados ou parafinicos em terra podem apresentar relacőes custo/beneficio satisfatorias a explotacăo, apesar das dificuldades de producăo. A extracăo deste tipo de oleo em aguas profundas envolve dificuldades e custos muito superiores aos de operacőes em terra, tomando desejavel a obtencăo de informacőes a priori sobre o tipo de oleo no intuito de otimizar investimentos. Avaliou-se a sensibilidade do metoda sismico a previsao do tipo de oleo tomando-se tres casos de reservatorios distintos: areia limpa, arenito pouco consolidado e arenito bem consolidado e analisando-se seus comportamentos sismicos para diferentes tipos de oleos atraves de modelagens petrofisicas e sismicas, Observa-se que a influencia do fluido sobre as propriedades sismicas do reservatorio depende mais do grau de consolidacăo da rocha do que da porosidade, de forma que a determinacăo do tipo de oleo pelo metoda sismico e facilitada no caso de areias e arenitos pouco consolidados. A aplicacăo da tecnica de AVO acrescenta rnais informacőes ao processo, embora a parte rnais relevante das informacőes esteja contida nos coeficientes de reflexăo para incidencia normal. Com dados reais, tal deterrninacăo e dificultada limitando-se a previsőes qualitativas que devem ser acompanhadas de esforcos de calibracăo dos atributos sismicos, petrofisicos e litologicoso
8th International Congress of the Brazilian Geophysical Society, 2003
Seismic anisotropy has received recently more attention in the oil industry. Anisotropy effects c... more Seismic anisotropy has received recently more attention in the oil industry. Anisotropy effects can be extremely hazard to the seismic horizons positioning and amplitude recovering, on well log processing, interpretation and seismic tie. Nowadays, geophysicists have some tools to estimate and correct the anisotropy effects on seismic data. However, the solution of this problem is still beyond from its exhaustion. In this paper we discuss the anisotropic properties of shales and interbedded sequences based on laboratory and log results and, also, some issues on anisotropy upscaling.
4th International Congress of the Brazilian Geophysical Society, 1995
A avaliacăo do modulo de cisalhamento estatico das rochas, a partir dos perfis geofisicos de poco... more A avaliacăo do modulo de cisalhamento estatico das rochas, a partir dos perfis geofisicos de pocos, e proposta neste trabalho baseada em urn conjunto de medicőes feitas em laboratorio. O modulo de cisalhamento elastico estatico de um folhelho pouco consolidado da Bacia de Campos (RJ - Brasil) foi obtido, in situ, por uma nova ferramenta disponivel no mercado a qual mede as deformacőes apresentadas pelo poco, a cada 30°, quando este e submetido a um teste de micro-fraturamento hidraulico. Por outro lado, os modulos elasticos dinâmicos do folhelho foram obtidos atraves dos perfis geofisicos de velocidades e de densidade total. A transformacăo destes modulos dinâmicos nos seus correspondentes estaticos foi feita atraves de relacőes lineares empiricas observadas em laboratorio a partir de medicőes simultaneas dos modulos elasticos dinâmicos e estaticos em um conjunto de amostras de rocha. Assim, foi possivel a comparacăo entre o modulo de cisalhamento estatico medido in situ e o modulo de cisalhamento estatico estimado a partir dos perfis geofisicos.
10th International Congress of the Brazilian Geophysical Society & EXPOGEF 2007, Rio de Janeiro, Brazil, 19-23 November 2007, 2007
The optimization of the quantitative seismic data interpretation process is a key factor for rese... more The optimization of the quantitative seismic data interpretation process is a key factor for reservoir characterization and monitoring. In this paper, we show the results of a methodological investigation where Neural Network and Discriminant Analysis, two possible tools to incorporate the 4D seismic attributes in the quantification of saturation changes during the production of a reservoir, where analyzed. A special focus was applied to the evaluation of the impact of the quality and the amount of the calibration data to the final result, showing the pseudo-well technology as a good alternative to improve the process.
International Petroleum Technology Conference, 2013
The main objective of this project was to evaluate the ability to derive petrophysical properties... more The main objective of this project was to evaluate the ability to derive petrophysical properties like porosity from pre-stack seismic data in a carbonate environment. We apply a direct petrophysical inversion technique to an offshore carbonate reservoir. Starting from an initial geological model in depth and a number of carefully conditioned seismic angle stacks, we derive a detailed 3-D model of the porosity and hydrocarbon saturation matching the observed seismic data. We use a well-calibrated Petro-Elastic Model (PEM) to link the petrophysical properties to the seismic velocities. We compare inversion results obtained using the Xu-Payne and T-matrix PEMs which both account for carbonate pore geometry, lithology, porosity and fluid content but have different elastic sensitivity to fluid saturations. The inverted results provide detailed images of the spatial variations of porosity and fluid content across the reservoir interval. Obtaining estimates of absolute saturations values is more difficult, as saturation estimation is strongly dependent on the choice of PEM. Introduction Carbonate reservoirs are notoriously heterogeneous. Seismic inversion is therefore needed to help estimate the spatial variations of rock type, porosity and fluid content in between the available wells. We present the results of a direct inversion of porosity and saturations from seismic pre-stack data over an offshore carbonate reservoir.
Novas tecnologias de exploracăo de petroleo voltam-se ao estudo detalhado de reservatorios e ŕ pr... more Novas tecnologias de exploracăo de petroleo voltam-se ao estudo detalhado de reservatorios e ŕ procura de indicadores diretos de hidrocarbonetos. (DHIs). As relacőes de Gassmann e de Biot-Geerstsma săo usualmente utilizadas buscando uma melhor compreensăo de fenomenos como bright-spots, crescimento de amplitudes com o offset e reflexőes de contato de fluidos, entre outros.
Several Brazilian offshore fields are build of unconsolidated and complex sandstones. This fact c... more Several Brazilian offshore fields are build of unconsolidated and complex sandstones. This fact cause many problems in some logs, mainly in velocity logs. As seismic and AVO modeling need these logs as input, some times it is necessary to do corrections in these logs, that is the main goal of this work. In order to do these corrections it was necessary to make log velocities calibration using laboratory measurements (compressional and shear velocities, density and porosity), fluid substitution methods and logs data. From the results it is possible to see that a log Vp correction between 10% and 15% it is necessary. This correction is obvious when we compare these results with a well without problems like acquisition and interpretation.
D004 SEISMIC FACIES INTERPRETATION IN A TURBIDITIC ENVIRONMENT FROM PRE-STACK DATA: A CASE STUDY ... more D004 SEISMIC FACIES INTERPRETATION IN A TURBIDITIC ENVIRONMENT FROM PRE-STACK DATA: A CASE STUDY Summary 1 Seismic facies analysis aims at interpreting a set of features measured locally in reservoirs in terms of qualitative properties. This paper presents a real-case study from a deep-offshore field located in Brazil. The aim of this work is to interpret pre-stack inversion results (P and S-Impedance cubes) obtained by joint pre-stack stratigraphic inversion in terms of seismic facies. This study tackles some issues such as well-to-seismic data integration upscaling of lithofacies and facies definition and identification in a real world. Introduction In the recent
5th International Congress of the Brazilian Geophysical Society, 1997
Reservatorios de oleos pesados ou parafinicos em terra podem apresentar relacőes custo/beneficio ... more Reservatorios de oleos pesados ou parafinicos em terra podem apresentar relacőes custo/beneficio satisfatorias a explotacăo, apesar das dificuldades de producăo. A extracăo deste tipo de oleo em aguas profundas envolve dificuldades e custos muito superiores aos de operacőes em terra, tomando desejavel a obtencăo de informacőes a priori sobre o tipo de oleo no intuito de otimizar investimentos. Avaliou-se a sensibilidade do metoda sismico a previsao do tipo de oleo tomando-se tres casos de reservatorios distintos: areia limpa, arenito pouco consolidado e arenito bem consolidado e analisando-se seus comportamentos sismicos para diferentes tipos de oleos atraves de modelagens petrofisicas e sismicas, Observa-se que a influencia do fluido sobre as propriedades sismicas do reservatorio depende mais do grau de consolidacăo da rocha do que da porosidade, de forma que a determinacăo do tipo de oleo pelo metoda sismico e facilitada no caso de areias e arenitos pouco consolidados. A aplicacăo da tecnica de AVO acrescenta rnais informacőes ao processo, embora a parte rnais relevante das informacőes esteja contida nos coeficientes de reflexăo para incidencia normal. Com dados reais, tal deterrninacăo e dificultada limitando-se a previsőes qualitativas que devem ser acompanhadas de esforcos de calibracăo dos atributos sismicos, petrofisicos e litologicoso
8th International Congress of the Brazilian Geophysical Society, 2003
Seismic anisotropy has received recently more attention in the oil industry. Anisotropy effects c... more Seismic anisotropy has received recently more attention in the oil industry. Anisotropy effects can be extremely hazard to the seismic horizons positioning and amplitude recovering, on well log processing, interpretation and seismic tie. Nowadays, geophysicists have some tools to estimate and correct the anisotropy effects on seismic data. However, the solution of this problem is still beyond from its exhaustion. In this paper we discuss the anisotropic properties of shales and interbedded sequences based on laboratory and log results and, also, some issues on anisotropy upscaling.
4th International Congress of the Brazilian Geophysical Society, 1995
A avaliacăo do modulo de cisalhamento estatico das rochas, a partir dos perfis geofisicos de poco... more A avaliacăo do modulo de cisalhamento estatico das rochas, a partir dos perfis geofisicos de pocos, e proposta neste trabalho baseada em urn conjunto de medicőes feitas em laboratorio. O modulo de cisalhamento elastico estatico de um folhelho pouco consolidado da Bacia de Campos (RJ - Brasil) foi obtido, in situ, por uma nova ferramenta disponivel no mercado a qual mede as deformacőes apresentadas pelo poco, a cada 30°, quando este e submetido a um teste de micro-fraturamento hidraulico. Por outro lado, os modulos elasticos dinâmicos do folhelho foram obtidos atraves dos perfis geofisicos de velocidades e de densidade total. A transformacăo destes modulos dinâmicos nos seus correspondentes estaticos foi feita atraves de relacőes lineares empiricas observadas em laboratorio a partir de medicőes simultaneas dos modulos elasticos dinâmicos e estaticos em um conjunto de amostras de rocha. Assim, foi possivel a comparacăo entre o modulo de cisalhamento estatico medido in situ e o modulo de cisalhamento estatico estimado a partir dos perfis geofisicos.
10th International Congress of the Brazilian Geophysical Society & EXPOGEF 2007, Rio de Janeiro, Brazil, 19-23 November 2007, 2007
The optimization of the quantitative seismic data interpretation process is a key factor for rese... more The optimization of the quantitative seismic data interpretation process is a key factor for reservoir characterization and monitoring. In this paper, we show the results of a methodological investigation where Neural Network and Discriminant Analysis, two possible tools to incorporate the 4D seismic attributes in the quantification of saturation changes during the production of a reservoir, where analyzed. A special focus was applied to the evaluation of the impact of the quality and the amount of the calibration data to the final result, showing the pseudo-well technology as a good alternative to improve the process.
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