1887

Abstract

The Dogger limestones in Paris Basin are one of the potential candidates for hosting the first CO2 geological storage in France. The permeability of these carboneous rocks measured on laboratory specimens are generally low and do not represent the permeabilities at a larger size, obtained during geothermal or hydrocarbon exploitations. Fracturation is responsible, partly or even in totality, for these differences. Our task was to demonstrate that it was possible to calculate the permeability « at large » of the small fracturation of the Dogger, in order to give input data adapted to the size of the meshes of equivalent continuous models simulating CO2 injection in the target aquifer. We proposed a conceptual model of the stratified fractured rock mass, made of regularly 3m spaced stratification horizontal joints and four sets of statistical sub-vertical fractures. We simulated the 3D fractures network and computed the permeability due to the small fracturation with a Discrete Fracture Network approach. A parametric study showed the great importance of the horizontal stratification joints and of the longest sub-vertical fractures that cross many stratification beds on the global flow behaviour of the fractured rock mass.

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/content/papers/10.3997/2214-4609.20146160
2008-09-29
2020-04-09
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20146160
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