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Propriétés élastiques et anisotropie des roches mères : approche expérimentale multi-échelle et modélisation par milieu effectif

Abstract : The oil and gas production from unconventional reservoirs represents a large part of North America’s production. Improving the knowledge of source rock characteristics constitutes a major scientific and economic challenge. This thesis focuses on the elastic properties and anisotropy of source rocks and combines a multiscale experimental workflow with modeling using an effective medium approach.The studied samples come from Montney and Doig formations (Western Canada sedimentary basin). Our experimental data have been compared to an experimental database built from literature data of different source rock formations. This comparison illustrates the links between acoustic properties and several source rock internal parameters (density, porosity, composition) and external parameters (confining pressure during acoustic tests). The main observations show the influence of the content of clays and organic matter and of the porosity on the velocities and the specific influence of clays on the anisotropy of source rocks. The different components of Montney and Doig formations have been characterized through the combination of nanoindentation measurements and SEM-EDS analyses.The observations and experimental results of this thesis have been integrated into effective medium models which take into account source rock microstructure. A simple model based on five isotropic phases and one transverse isotropic phase (clays) has first been defined. It allows the estimation of the elastic properties of source rocks, but underestimates their anisotropy. This model has then been adapted to the specificities of Montney and Doig formations. For these formations, SEM observations indicate that clays and organic matter are localized between grains. The clays-OM-pores composite thus adds compliance to Montney and Doig formations by coating the other minerals. The elastic properties measured through nanoindentation are used as input data. The clays are modeled as an isotropic phase and the muscovite as a transverse isotropic phase. The derived model enables us to estimate the elastic properties and the anisotropy of our samples
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Hamza Tazi. Propriétés élastiques et anisotropie des roches mères : approche expérimentale multi-échelle et modélisation par milieu effectif. Matériaux. Université Paris-Est, 2019. Français. ⟨NNT : 2019PESC1022⟩. ⟨tel-02878713⟩

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