On chalk fabrics and their influence on deformation behaviour

The deformation of high porosity chalks has become a major factor in understanding their performance as<br>hydrocarbon reservoirs. Chalks with porosities in excess of 30% readily undergo large volumetric strains when<br>subject to fluid production and pore pressure depletion in many cases passing through a phase transition from<br>elastic to ductile compaction behaviour with commensurate large increases in compressibility.