A simplified model for mercury porosimetry hysteresis

A modified Random Corrugated Pore Structure Model (CPSM) simulating Mercury Porosimetry (MP) hysteresis and entrapment phenomena is proposed. The mode l have been applied in parametric sensitivity studies and data regression t ests by using a single parameter Bell Shape Distribution (BSD) function as the intrinsic pore size distribution (psd). The new CPSM version proved to be superior compared to its original counterpart since it achieves a sensib le evaluation of the trapped mercury distribution, enables the construction of a "closed" (zero entrapment) hysteresis loop and makes realistic predic tions of the intrinsic pore volume and surface area distributions. CPSM pre dicted intrinsic psd's for reservoir sand stones compare satisfactorily wit h those measured independently by a photomicrography method. The model also provides the basis for the development of a least square computer code sui table for further improved psd calculations.