Model of the Structured Continuum, and the Relation Between Specific Surface Area, Porosity and Permeability

Sibiryakov, Boris; Leite, Lourenildo W. B.; Vieira, Wildney W. S.

doi:10.22564/rbgf.v31i4.337

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…The goal is the mapping of areas of low (example, rock reservoir) and high (example, rock generator) pressure zones that act as natural pumps for the accumulation of fluids (Payton, 1977). In this direction, Sibiryakov et al (2014) have also presented the basic theory, and Silva (2016) presented results that also serves as precursors to the present work. Pressure prediction, in sedimentary basin modeling for oil and gas exploration, is a very attractive subject that can contribute to complex geological understanding, and to participate in the location of a borehole for a successful productive well.…”

Section: Introductionmentioning

confidence: 78%

Modeling and Pressure Prediction of a Block of the Jequinhonha Basin

Vieira¹,

Leite²,

Sibiryakov

2017

Rev. Bras. Geof.

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ABSTRACT. We present in this paper a seismic-stratigraphical framework for pressure prediction for oil and gas exploration in sedimentary basins, that is based on seismic information, with application to a marine part of the Jequitinhonha basin (east of the State of Bahia, Brazil). For this purpose it is necessary the knowledge of velocity distributions (compressional vP and shear vS), that can be obtained from seismic sections, petrophysical information and empirical models, and the distribution of density (ρ). We show some details of the theoretical modeling method, with an example that shows how pressure varies in the subsurface. We highlight that pressure that does not necessarily increase linearly with depth, but in a complex way that requires specific numerical calculations to be able to see important details related to a reservoir and surroundings. The model considers the vertical gravity load as the source of pressure in the geological formations, and in the present case we do not take into account the effects of formation curvatures, faulting, diagenesis and lateral tectonic events. We show that the meaning of cap rock of a reservoir is not to be related to lithology, but directly to the physics of high and low pressure zones that results from the mechanics of solid bodies under a stress-strain system; in this direction, and as a curiosity, we also show how a basement rock can become a reservoir. It is important to emphasize that an accurate prediction needs a 3D model for a meaningful and complete practical application, in the other hand, it requires handling large matrices. Keywords: basin modeling, seismic velocity analysis, pressure prediction, empirical models. RESUMO. Este artigo tem como objetivo compor uma estratégia sismo-estratigráfica onde se visa a predição de pressão na exploração de gás e óleo em bacias sedimentares com base em informação sísmica, com aplicação a uma parte marinha da bacia de Jequitinhonha (leste do estado da Bahia, Brasil). Para esta finalidade ´e necessário o conhecimento das distribuições de velocidades (compressiva vP e cisalhante vS) que podem ser obtidas a partir de seções sísmicas, informações petrofísicas e modelos empíricos, e da distribuição de densidade (ρ). Apresentamos alguns detalhes da modelagem teórica, e um exemplo para mostrar como a pressão varia na subsuperfície, onde destacamos que a predição de pressão não aumenta necessariamente linearmente, mas de uma forma complexa que requer cálculos numéricas específicos para poder obter detalhes relacionados a um reservatório. O modelo apresenta a carga vertical da gravidade como a fonte de pressão nas formações geológicas, e neste caso não se leva em consideração os efeitos de curvaturas das camadas, falhas, diagênese e eventos tectônicos laterais. Mostramos que o significado de uma rocha selante de um reservatório não deve estar relacionado `a litologia, mas simplesmente à física de zonas de alta e baixa pressão como resultado da mecânica dos corpos sólidos sob o sistema de tensão-deformação; neste sentido, e como curiosidade, mostramos também como uma rocha do embasamento pode se tornar um reservatório de óleo e gás. É importante observar que uma predição com precisão necessita de um modelo 3D para uma aplicação prática significativa e completa, mas que requer o manuseio de matrizes grandes. Palavras-chave: modelagem de bacia, análise de velocidade sísmica, predição de pressão, modelos empíricos.

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Section: Introductionmentioning

confidence: 78%

Modeling and Pressure Prediction of a Block of the Jequinhonha Basin

Vieira¹,

Leite²,

Sibiryakov

2017

Rev. Bras. Geof.

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“…The Regência petroleum system is responsible for all hydrocarbon occurrences in the Jequitinhonha Basin. However, it is necessary to emphasize that a rock is a reservoir candidate if it fulfills the mechanical-static conditions of pressure (Sibiryakov et al, 2014;Andrade, 2018).…”

Section: Bacia De Jequitinhonhamentioning

confidence: 99%

3D Geological Pressure Prediction for a Block of the Jequitinhonha Basin

Andrade¹,

Leite²,

Viera³

2019

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef

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“…В принципе, возможен прогноз состояния среды, прежде всего напряженного состояния. Известно, что расчет напряженного состояния по данным о пластовых скоростях продольных и поперечных волн, а также плотности пород и конфигурации структур сводится к интегрированию уравнений равновесия упругого тела с граничными условиями непрерывности векторов перемещений и нагрузок на сейсмических границах [Sibiryakov et al, 2004[Sibiryakov et al, , 2013[Sibiryakov et al, , 2015. Существуют методы, использующие все точки трехмерного пространства, такие как метод конечных элементов, и методы более экономичные, где результирующая линейная система содержит информацию только о точках границ геологической среды.…”

Section: Introductionunclassified

Prediction of Compression and Extension Zones in Geological Structures Based Only on the Velocities of Longitudinal Waves in the Geological Medium

Сибиряков

Khogoev

2019

Geodin. tektonofiz.

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The article presents accurate solutions for the problem for two elastic half‐spaces with an arbitrary curvilinear interface. Our study shows that dilatation solutions (Poisson integrals) are dependent on neither an overall compression modulus nor the Poisson ratio, and depend only on the velocity of longitudinal waves. These specific solutions can be supplemented by general solutions for an incompressible elastic medium, and the boundary conditions of the rigid contact for the sum of the solutions can thus be satisfied. Relatively simple calculations make it possible to determine the divergence of the displacement field and reduce the entire problem solving process to a study of Poisson equations with a known divergence. Furthermore, predictions of volumetric compression or extension are important for geological investigations, since the zones characterized by reduced pressure rates may act as fluid attractors.

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Model of the Structured Continuum, and the Relation Between Specific Surface Area, Porosity and Permeability

Cited by 10 publications

References 6 publications

Modeling and Pressure Prediction of a Block of the Jequinhonha Basin

Modeling and Pressure Prediction of a Block of the Jequinhonha Basin

3D Geological Pressure Prediction for a Block of the Jequitinhonha Basin

Prediction of Compression and Extension Zones in Geological Structures Based Only on the Velocities of Longitudinal Waves in the Geological Medium

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