Abstract
Pressure decline caused by the extraction of oil from deep sedimentary layers depends on the pore modulusKpp, a poroelastic parameter that characterizes the effect of pressure change on pore volume under constant mean stress. Measurement ofKppis difficult, however, as it requires calibration to account for fluid compressibility and compliance of the testing system. Nevertheless, knowing the easily measurable drained pore modulusKpand adopting an assumption on the unjacketed pore modulusKs″, it is possible to determineKppbecause these pore moduli are related. Previous work on indirectly estimatingKs″ claimed thatKs″ is strongly dependent on Terzaghi effective pressureP′and therefore not a constant; also,Ks″ might be different fromKs, the solid bulk modulus of the major mineral constituent. We overcome the limitations of the indirect approach by directly measuringKs″. The experiments reveal thatKs″ is indeed a constant and that for an ideal porous rock, the assumption ofKs′′=Ksholds. Furthermore, a constantKs″ implies thatKpandKppare functions of Terzaghi effective pressure only. These results provide a framework to accurately determine the Skempton coefficientB.
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