Identification of poroelastic constants of tight rocks from laboratory tests

Brice Lecampion (1) , Andrei Constantinescu (2) , Laurent Malinski (2)

1 CSIRO Division of Petroleum Resources, Kensington, Australia
2 LMS - Laboratoire de mécanique des solides

This paper discusses the identification of poroelastic constants and hydraulic conductivity from two transient laboratory tests performed on cylindrical core: drained isotropic confinement and pulse test. The combination of the two tests allows us to estimate all poroelastic parameters with the exception of the shear modulus. Despite the lack of analytical solutions for the fully coupled case, closed form solutions of the forward problems are obtained for a slender specimen. The validity of these solutions for a realistic aspect ratio of the core is assessed by a comparison with a finite element model. The identification problem is solved by minimizing a least square functional using an explicit gradient computed using the direct differentiation of the closed form solution and a Levenberg–Marquardt algorithm. The uniqueness of this inverse problem as well as the effect of noise on input data are fully discussed. The identification procedure is then applied to tests performed on a deep argillaceous rock (argillite of Meuse Haute–Marne).

Mots clés: Permeability; Experimentation; Rocks; Poroelasticity; Laboratory tests; Hydraulic conductivity

Domaines: Mécanique [physics.med-ph]

Brice Lecampion, Andrei Constantinescu, Laurent Malinski. Identification of poroelastic constants of tight rocks from laboratory tests. International Journal of Geomechanics, 2006, 6, pp.201-208. ⟨10.1061/(ASCE)1532-3641(2006)6:3(201)⟩. ⟨hal-00111451⟩