Effective stress law for the permeability of clay-rich sandstones
2004 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 109, no 4, 1-10 p.Article in journal (Refereed) Published
Two models of clay-rich sandstones are analyzed to explain the relative sensitivity ofpermeability to pore pressure and confining pressure. In one model the clay lines the entire pore wall in a layer of uniform thickness, and in the second model the clay is distributed in the form of particles that are only weakly coupled to the pore walls. Equations of elasticity and fluid flow are solved for both models, giving expressions for theeffective stress coefficients in terms of clay content and the elastic moduli of the rock andclay. Both models predict that the permeability will be much more sensitive to changes in pore pressure than to changes in confining pressure. The clay particle model gives somewhat better agreement with data from the literature and with new data on a Staintonsandstone having a solid volume fraction of 8% clay.
Place, publisher, year, edition, pages
2004. Vol. 109, no 4, 1-10 p.
Clay, Effective stress, Permeability, Sandstones
IdentifiersURN: urn:nbn:se:kth:diva-87455DOI: 10.1029/2003JB002836ISI: 000221087100002OAI: oai:DiVA.org:kth-87455DiVA: diva2:501668
QC 201202292012-02-142012-02-142012-02-29Bibliographically approved