Available experimental data on elastic velocities of clay-air mixtures and clay-brine mixtures as a function of porosity are re-interpreted. Pore radius as calculated from porosity and specific surface measured by BET seems to be the factor controlling stiffness of these un-cemented sediments. For each of the two pore fluids: air or brine smectitic clay and kaolinitic clay seem to have similar power law relationships between a given elastic modulus and pore radius. These results indicate that pore radius and thus permeability of shale in the depth interval of mechanical compaction may be predicted from porosity and sonic velocity.
|Title of host publication||Unconventional ressources and the role of technology: 73rd EAGE Conferenc & exhibition|
|Volume||Conference proceedings & exhibitors' catalogue. CD-ROM|
|Publication status||Published - 2011|
|Event||73rd EAGE Annual Conference and Exhibition incorporating SPE Europec 2011 - Vienna, Austria|
Duration: 23 May 2011 → 26 May 2011
|Conference||73rd EAGE Annual Conference and Exhibition incorporating SPE Europec 2011|
|Period||23/05/2011 → 26/05/2011|