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Category Text Publication
Reference Category Journals
DOI 10.1007/s11242-015-0564-z
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Title (Primary) Hydro-mechanical evolution of transport properties in porous media: constraints for numerical simulations
Author Jacquey, A.B.; Cacace, M.; Blöcher, G.; Watanabe, N.; Scheck-Wenderoth, M.
Source Titel Transport in Porous Media
Year 2015
Department ENVINF
Volume 110
Issue 3
Page From 409
Page To 428
Language englisch
Keywords Poroelasticity; Numerical modeling; OpenGeoSys; Porosity; Sandstones
UFZ wide themes RU5;
Abstract During geothermal operations, injection and production of fluid can induce significant pore pressure and temperature changes which impact the stress field thus affecting the reservoir performance. In this context, the transport and mechanical properties of the porous rock can be altered by deformation of the pore and bulk volumes. Different poroelastic formulations for describing the hydro-mechanical behavior of porous rocks are considered. Additionally, a formulation for the drained bulk modulus is introduced which takes into account the poroelastic behavior. This poroelastic formulation has been implemented in the 3D finite element method-based simulator OpenGeoSys to predict porosity changes. Based on the porosity changes, permeability variation under different loading conditions as main property controlling transport of mass and energy in porous media is determined by the Kozeny–Carman relation. Triaxial laboratory experiments conducted on two different kinds of sandstones (Flechtinger and Bentheimer) are used to constrain parameters which control porosity changes and thus permeability changes under drained conditions and to calibrate the numerical simulations. Hydrostatic loading from 1 to 70 MPa in confining stress has been simulated for Flechtinger and Bentheimer sandstones resulting in porosity and permeability decreases. Results are compared to experimental measurements to evaluate the precision of each poroelastic model. Reduction in porosity of 8.1 % with about 1.15 % error for the Flechtinger sandstone has been simulated and of 1.4 % with about 0.54 % error for the Bentheimer sandstone.
Persistent UFZ Identifier
Jacquey, A.B., Cacace, M., Blöcher, G., Watanabe, N., Scheck-Wenderoth, M. (2015):
Hydro-mechanical evolution of transport properties in porous media: constraints for numerical simulations
Transp. Porous Media 110 (3), 409 - 428 10.1007/s11242-015-0564-z