Contribution à la caractérisation du comportement géomécanique des roches couverture des réservoirs pétroliers

Abstract : Knowledge of shale poromechanical behavior is essential for various environmental issues such as CO2 deep geological storage, high level radioactive waste storage, oil field abandonment Furthermore, due to their good confinement properties, there are considered as potential host rocks for high level radioactive waste storage. However, their experimental characterization is very complex because of their very low permeability and their saturating fluid sensitivity. The main objective of this study is to improve knowledge of hydromechanical coupling of such a material. To study the structure of argillites under stress, SEM in-situ uniaxial compression test is performed on parallelepiped sample; compression orientation is perpendicular to bedding planes direction. Correlation techniques are used to estimate strain distributions. Second part underlines the key points of shale experimental characterization using the framework of Biot's mechanics of fluid saturated porous solids. Shales are well known as a more or less transverse isotropy material. The complete methodology to conduct dometric tests on such sensitive and weakly permeable material is described. Measurements realized on Tournemire argillite are proposed and a comparison with the poroelastic parameters of Meuse / Haute-Marne is given. Furthermore, to investigate hydromechanical coupling, a transverse isotropic poroelastic model is used to estimate the influence of anisotropy on diffusion characteristic time. The experimental data are used in numerical simulations to estimate the intrinsic permeability of the samples. In the last part, the caprock behavior of a petroleum field is studied at large scale with a 3D synthetic model (finite element analysis). The purpose of this last chapter is to study changes in stress field during the oil production
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Aurélien Noiret. Contribution à la caractérisation du comportement géomécanique des roches couverture des réservoirs pétroliers. Autre. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL014N⟩. ⟨tel-01748752⟩

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