Mechanisms of gas migration in flooding post-mining context

International audienceThe French national institute for industrial environment and risks (ineriS), in a support mission to state services and as a partner of the european project FLOMineT, is studying gas migration during and after mine flooding. in situ flow measurements and laboratory records acquired with an experimental device are being used to study gas transfer and to characterize the influence of hydrostatic pressure on methane release from coal. in parallel, several models are in development using the HYTec code to describe mine methane migration. The combined use of numerical and experimental approaches will make it possible to improve risk prevention concerning surface gas emission above the old mines

METSTOR: a GIS to look for potential storage zones in France

International audienceCommunication : http://minh.haduong.com/files/Bonijoly.ea-2008-METSTOR-GHGT9.pdf - Actes : http://web.mit.edu/ghgt9

METSTOR: A GIS to look for potential CO2 storage zones in France

International audienceThe METSTOR project offers a methodology to look for potentially interesting CO2 storage areas in France at the initial stage, before the "site selection" step. Our tool, embodied in a Geographic Information System, is based on an interactive map of CO2 storage capacities. Other relevant information layers are included. The geographic layers are complemented with a series of online technical notices. It seems to be the first open online GIS that offers policy makers, businesses and the public at large an integrated access to that necessary information. Our prototype, limited mainly to the Paris Basin, is released online at www.metstor.fr

Evaluating sealing efficiency of caprocks for CO2 storage: an overview of the Geocarbone Integrity program and results

8 pagesInternational audienceThe objectives of the Geocarbone-Integrity program are to develop techniques, methodologies and knowledge concerning the long term confinement of CO2 in geological storage. Linked to other French programs such as Geocarbone Injectivity or Picoref, it is an integrated approach involving geochemistry, petrophysics, geology and geomechanics. Different scales must be considered in order to describe caprocks: from the pore or grain scale in petrophysics and geochemistry, to regional scale in geology and geomechanics. The program focused on a specific site of the Paris basin but the methodologies developed are general and can be applied elsewhere

METSTOR: A GIS to look for potential CO2 storage zones in France

The METSTOR project offers a methodology to look for potentially interesting CO2 storage areas in France at the initial stage, before the "site selection" step. Our tool, embodied in a Geographic Information System, is based on an interactive map of CO2 storage capacities. Other relevant information layers are included. The geographic layers are complemented with a series of online technical notices. It seems to be the first open online GIS that offers policy makers, businesses and the public at large an integrated access to that necessary information. Our prototype, limited mainly to the Paris Basin, is released online at www.metstor.fr.CO2 storage; Carbone capture and storage; Methodology; France; Site selection; Geographic information system; Storage capacities; Aquifers; Coal deposits; Depleted fields; Risk assessment

METSTOR: A GIS to look for potential CO2 storage zones in France

AbstractThe METSTOR project offers a methodology to look for potentially interesting CO2 storage areas in France at the initial stage, before the “site selection” step. Our tool, embodied in a Geographic Information System, is based on an interactive map of CO2 storage capacities. Other relevant information layers are included. The geographic layers are complemented with a series of online technical notices. It seems to be the first open online GIS that offers policy makers, businesses and the public at large an integrated access to that necessary information. Our prototype, limited mainly to the Paris Basin, is released online at www.metstor.fr

2D reactive transport simulation of well clogging during acidic uranium in situ recovery process

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Experimental characterization of CH4 release from coal at high hydrostatic pressure

International audienceCoal mines naturally emit gases, mostly methane, during exploitation and at the beginning of flooding. Once they are flooded, the conditions of gas migration are changed, and the capacity of release and retention of gas by coal is poorly known. The experimental device CASPER has made it possible to demonstrate and quantify a significant release of methane from coal under more than 3 MPa of hydrostatic pressure. The analysis of these results showed that the main fraction of released methane comes from sorption sites. The porous volume has a minor role in reaching content equilibrium, but has a strong effect on hydrostatic pressure, due to water penetration into the coal structure

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Geometry and mineral heterogeneity controls on precipitation in fractures: An X-ray micro-tomography and reactive transport modeling study

International audienceThe processes that affect reorganization of flow and transport in fractures during precipitation were investigated experimentally and numerically in order to highlight the interplay between calcite precipitation, flow and growth substrate. Calcite was precipitated from a supersaturated solution at two different flow rates (0.4 or 12 cm3·hr−1) into artificial fractures made in dolomitic limestone. Although the inlet fluid composition and temperature were identical for all the experiments, facture sealing and precipitation patterns were closely linked to the mineral substrate, fracture geometry and flow field reorganization. Calcite precipitation rate is highly variable along and between the flow paths and depends on the local saturation index of the reactive fluid. In addition, calcite precipitates preferentially on calcite comparatively to dolomite substrate. 2D reactive transport modeling accounting for the negative feedback between porosity and permeability decrease succeeded in quantitatively reproducing the experimental observations, such as the evolution of the fracture void obtained from X-ray micro-tomography (XMT), the evolution of the calcium breakthrough concentration and fracture sealing. The corresponding model was then used to evaluate the impacts of fluid flow and reactivity on randomly generated anisotropic fractures geometries. Simulation results reveal that the sealing capacity of fractures and associated reorganization of flow depends on the Damköhler number, i.e., the ratio between characteristic times for advective transport and reaction, although other factors like the fracture geometry and kinetic law play also a role at this stage. More importantly, the existence of a critical saturation index for initiating precipitation onto mineral substrate can substantially impair the prediction of the sealing capacity, and will depend on the spatial heterogeneity and connectivity of the mineral substrate. Most cases result in a strong precipitation gradient along the flow direction that will increase the permeability anisotropy. However, under certain conditions, precipitation allows the fracture to recover more isotropic properties that will lead back to a more uniform flow field and sealing. Negative feedback between precipitation process and transport during fracture closure supports a strong reorganization of flow of supersaturated fluids during geo-engineering operations