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Libération et migration du méthane depuis le charbon dans un contexte hydrogéologique post-minier : développement d'un protocole expérimental et approche numérique

Abstract : An experimental laboratory device has been developed in order to better characterize the possibility if gas emissions from flooded coal mines. Coal samples, saturated with methane, have been submitted at hydrostatic pressure from 3 to 4.3 MPa in an autoclave cell. The initial set-up and the technical apparatus added during the thesis work permit to establish an operational protocol. The results and their analysis highlight two processes: a significant desorption of methane from the flooded coal and the impact of the water penetration in the coal pores on the hydrostatic pressure. The pressure levels the coal was submitted to reveal that an increase of hydrostatic pressure enhances desorption and dissolution, as a consequence of a deeper solicitation of the methane-saturated pores.The experimental equilibrium constants have been taken into account in numerical models aiming to simulate the methane migration in flooded mine structures. The simplest models showed the importance of coal and mine voids permeability and the methane release limitation by flooding. The methane concentration in water is controlled by the desorption constant of the coal and its initial methane content. Other models simulating a flooding management context illustrate the impact of pumping on methane release and its influence concerning an eventual surface emission after decades or even century.
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Submitted on : Monday, September 24, 2012 - 12:07:12 PM
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  • HAL Id : pastel-00734686, version 1

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Nils Le Gal. Libération et migration du méthane depuis le charbon dans un contexte hydrogéologique post-minier : développement d'un protocole expérimental et approche numérique. Sciences de la Terre. Ecole Nationale Supérieure des Mines de Paris, 2012. Français. ⟨NNT : 2012ENMP0021⟩. ⟨pastel-00734686⟩

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