Abstract

We report an experimental study on the poromechanical behaviour of a sandstone rich in clay minerals. With the use of Biot's theory of poro-elasticity, results obtained from mechanical experiments performed in a triaxial cell at temperatures up to 200 C are compared with results of acoustic experiments performed under atmospheric pressure at room temperature. The sandstone exhibits non-linear stress- strain behaviour depending on pore water saturation and temperature. The poro-elastic parameters were also found to be stress and temperature dependent. Inconsistencies found between the parameters determined by various independent experimental techniques show, that the theory of poroelasticity does not describe the pore volume changes of this clay-rich sandstone well.

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