Predicting the Capillary Imbibition of Porous Rocks from Microstructure |
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| Authors: | Benavente David Lock Peter Ángeles García Del Cura M Ordóñez Salvador |
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| Institution: | (1) Departamento de Ciencias de la Tierra y el Medio Ambiente, Universidad de Alicante, Ap. 99, 03080 Alicante, Spain;(2) Laboratorio de Petrología Aplicada, Unidad Asociada CSIC-UA, Spain;(3) T. H. Huxley School of Environment, Earth Sciences and Engineering, Imperial College of Science, Technology and Medicine, London, SW7 2BP, U.K;(4) Instituto de Geología Económica, CSIC-UCM, Madrid, Spain |
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| Abstract: | The kinetics of capillary imbibition into porous rocks is studied experimentally and theoretically. The Washburn law is modified by introducing various corrections relating to the microstructure of the rocks, such as tortuosity, pore shape (obtained experimentally), and applying the effective medium approximation (EMA) in order to calculate the effective radius that defines the hydraulic conductance and the topology of the capillary imbibition. The application of the EMA shows that capillary imbibition is mainly produced in 1-D, and the pore structure is constituted by different pore throats in series, linked by chamber pores. The capillary process has been discussed as a function of their petrography and pore structure. Our study of the Washburn equation and the addition of correction factors for the pore structure allows a very accurate prediction of the weight rate. |
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| Keywords: | capillary imbibition sorptivity effective medium approximation pore shape porous rocks |
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