A constitutive and numerical model for mechanical compaction in sedimentary basins

Bernaud, Denise; Dormieux, Luc; Maghous, Samir

doi:10.1016/j.compgeo.2006.05.004

Cited by 19 publications

(26 citation statements)

References 32 publications

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“…where k s and μ s are the bulk and shear moduli of the solid phase. It should be emphasized that the eulerian porosity ϕ is related to the skeleton plastic dilatation through (14). Under isotropy conditions, classical results of poroelasticity indicate that…”

Section: Poromechanical Constitutive Equationsmentioning

confidence: 99%

Two‐dimensional finite element analysis of gravitational and lateral‐driven deformation in sedimentary basins

Maghous

Brüch

Bernaud

et al. 2013

Num Anal Meth Geomechanics

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SUMMARYThe paper deals with the modeling of some aspects, such as the formulation of constitutive equations for sediment material or finite element approach for basin analysis, related to mechanical compaction in sedimentary basins. In addition to compaction due to gravity forces and pore-pressure dissipation, particular emphasis is given to the study of deformation induced by tectonic sequences. The numerical model relies upon the implementation of a comprehensive constitutive model for the sediment material formulated within the framework of finite poroplasticity. The theoretical model accounts for both hydromechanical and elasticityplasticity coupling due to the effects of irreversible large strains. From the numerical viewpoint, a finite element procedure specifically devised for dealing with sedimentary basins as open systems allows to simulate within a two-dimensional setting the process of sediment accretion or erosion.Several basin simulations are presented.The main objective is to analyze the behavior of a sedimentary basin during the different phases of its life cycle: accretion phase, pore-pressure dissipation phase and compressive/extensional tectonic motions.

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Section: Poromechanical Constitutive Equationsmentioning

confidence: 99%

Two‐dimensional finite element analysis of gravitational and lateral‐driven deformation in sedimentary basins

Maghous

Brüch

Bernaud

et al. 2013

Num Anal Meth Geomechanics

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“…As an example, Bourgeois (Bourgeois, 1997) has modified the formulation to make it relevant in the framework of one dimension finite strains. Also, Bernaud et al (Bernaud et al, 2002(Bernaud et al, , 2006 have proposed a tridimensionnal approach to describe the modification of the micro-structure of rock through micro-mechanics.…”

mentioning

confidence: 99%

Coupled Modeling of Sedimentary Basin and Geomechanics: A Modified Drucker–Prager Cap Model to Describe Rock Compaction in Tectonic Context

et al. 2019

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The aim of basin modeling is to characterise fluids and rocks in a basin considering its history and data partly describing its present state. In usual basin simulators, only a simplified description of geomechanics based on the hypothesis of oedometric strain is used. In order to both enhance the modelling of basin history and to characterise actual in situ stresses, the effect of stress redistribution, horizontal stresses and strain variations during basin history should be considered. To address this point, a coupled basingeomechanics framework based on a new constitutive law is proposed in this paper using the prototype simulator A 2. This framework has been built to provide relevant results for various kinds of basin cases including tectonic loading. A finite strain poro-mechanical approach is considered along with an modified Drucker-Prager Cap model to describe rock compaction under natural sedimentation, erosion and tectonics. The constitutive model can be seen as a tensorial extension of the compaction models of Athy or Schneider as it allows to recover the same behaviour in oedometric context. Simple test cases are modelled considering typical sand or shale properties, emphasing the effect of tectonic loading on present day pore pressures and in situ stresses. It appears that even relatively moderate tectonic loading (5% of horizontal strain) can lead to overpressures of several hundreds of bars and to a complete change in in situ stress regime for deeply buried layers (above a depth of 2000 meters).

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“…Segundo Hantschel e Kauerauf (2009), as simplificações, que incluem: estado 1D de deformação, incompressibilidade dos grãos e validade da curva de compactação de Athy (1930), são suficientes para capturar os efeitos básicos da compactação mecânica de sedimentos e da geração de excesso de poropressão na bacia sedimentar. Em contrapartida, outros efeitos relevantes para a evolução da bacia (atividade tectônica, halocinese), que suscitariam uma representação tridimensional das tensões e deformações, estariam mal representados [Bernaud et al (2006), Bruch (2016)].…”

Section: Motivaçãounclassified

“…Já Bernaud et al (2006) avaliam o problema da grande variação de porosidade observada durante a evolução temporal de bacias sedimentares através de um modelo de compactação puramente mecânica de sedimentos usando a formulação de deformações finitas. O comportamento poroelastoplástico utiliza o modelo Cam-Clay Modificado [Roscoe e Burland (1968)] como base, adequando-o às condições particulares da BPSM.…”

Section: Motivaçãounclassified

“…Posteriormente, Bruch (2016) desenvolve um modelo termoporomecânico para a compactação de sedimentos, estendendo aquele apresentado por Bernaud et al (2006). O autor realiza comparações entre as formulações puramente mecânica e químico-mecânica, avaliando também a influência do acoplamento térmico em ambos os casos, usando como base um cenário geológico simplificado (somente um litotipo em condição edométrica).…”

Section: Motivaçãounclassified

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Análise Geomecânica Direcionada À Modelagem De Bacias Sedimentares E Sistemas Petrolíferos

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A constitutive and numerical model for mechanical compaction in sedimentary basins

Cited by 19 publications

References 32 publications

Two‐dimensional finite element analysis of gravitational and lateral‐driven deformation in sedimentary basins

Two‐dimensional finite element analysis of gravitational and lateral‐driven deformation in sedimentary basins

Coupled Modeling of Sedimentary Basin and Geomechanics: A Modified Drucker–Prager Cap Model to Describe Rock Compaction in Tectonic Context

Análise Geomecânica Direcionada À Modelagem De Bacias Sedimentares E Sistemas Petrolíferos

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