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Hydromechanical interactions in a fractured carbonate reservoir inferred from hydraulic and mechanical measurements

Abstract : Hydromechanical coupled processes in a shallow fractured carbonate reservoir rock were investigated through field experiments coupled with analytical and numerical analyses. The experiments consist of hydraulic loading/unloading of a water reservoir in which fluid flow occurs mainly inside a heterogeneous fracture network made up of vertical faults and bedding planes. Hydromechanical response of the reservoir was measured using six pressure–normal displacement sensors located on discontinuities and two surface tiltmeters. A dual hydraulic behavior was characterized for low-permeability bedding planes well connected to highpermeability faults. Displacement responses show high-variability, nonlinear changes, sometimes with high-frequency oscillations, and a large scattering of magnitudes. Initial normal stiffnesses and effective normal stresses along fault planes were estimated in the field by interpreting pressure–normal displacement relations with a nonlinear function between effective normal stress and normal displacement. Two-dimensional discontinuum modeling with transient fluid flow was performed to fit measurements during hydraulic loading tests. Results show that the hydromechanical behavior of the reservoir is restored if a high stiffness contrast is allocated between low- and high-permeability discontinuities. Thus, a dual-permeability network of discontinuities will likely also be a contrasting stiffness network, in which the deformation of major flow-conducting discontinuities is significantly influenced by the stiffness of the surrounding less-permeable discontinuities.
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Submitted on : Monday, October 1, 2007 - 8:40:49 PM
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Frédéric Cappa, Yves Guglielmi, Pascal Fénart, Véronique Merrien-Soukatchoff, Alain Thoraval. Hydromechanical interactions in a fractured carbonate reservoir inferred from hydraulic and mechanical measurements. International Journal of Rock Mechanics and Mining Sciences, Pergamon and Elsevier, 2004, 42 (2005), pp.287-306. ⟨ineris-00175357⟩

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