Experimental study and micromechanical interpretation of the poroelastic behaviour and permeability of a tight sandstone. (March 2018)

• Record Type: Journal Article
• Authors: Wang, Yi; Jeannin, Laurent; Agostini, Franck; Dormieux, Luc; Skoczylas, Frédéric; Portier, Eric
• Is Part Of: International journal of rock mechanics and mining sciences. Volume 103(2018)
• Page Start: 89
• Page End: 95
• Publication Date: 2018-03
• Subjects: Tight sandstones -- Biot coefficient -- Permeability -- Micromechanical model -- Pore entrapment -- Cracks closure; Rock mechanics -- Periodicals; Soil mechanics -- Periodicals; Mining engineering -- Periodicals; Roches, Mécanique des -- Périodiques; Sols, Mécanique des -- Périodiques; Technique minière -- Périodiques; 624.151305
• DOI: 10.1016/j.ijrmms.2018.01.007
• Languages: English
• ISSNs: 1365-1609

Abstract

Abstract: This study focuses on the poroelastic behaviour and permeability of tight sandstones, which are characterized by a low porosity, a low gas permeability and a strong sensitivity to in-situ stress. Experimentally the Biot coefficient takes a value close to 1 at low confinement and decreases with increasing confining pressure; the permeability shows an important reduction with increasing confining pressure. This behaviour can be attributed to pore entrapment and to the closure of cracks and joints. Micromechanical models, considering low permeable sandstones as made up of an assemblage of grains with interfaces and pores, reproduce well the observed trends of Biot coefficient and permeability.