The reservoir characteristic curves include the pore radius distribution, throat radius distribution, pore throat radius ratio, and capillary pressure.
The pore throat radius distribution, and pore structure evaluation parameters, such as average pore throat radius (Rm), threshold pressure (Pd), maximum pore throat radius (Rmax) and so on, can also be precisely extracted.
Among induced anisotropies, alteration of throat radius is the most effective parameter on non-Darcy coefficient.
After formation is classified into three types by using the pore structure index, the pore throat radius cutoffs can be acquired to calculate irreducible water saturation from the pore throat radius distribution.
The spherical pore can be described by the pore radius, and the throat can be described by the ratio of the pore radius over the throat radius (the pore-throat radius ratio) and the tortuosity.
The porosity of the network model is strongly affected by pore void radius and to a lesser extent by pore throat radius, particularly when pore throat radius is small.
The pore-throat radius where throats account for the smallest amount in the pore space increases with the permeability, which indicates that larger proportions of large throats result in larger throat radius and higher pore connectivity, leading to higher permeability.
While average throat radius is constant, both permeability and non-Darcy coefficient are increasing with average body radius.
In order to evaluate this kind of reservoir more efficiently, in this study, we mainly measure the microscopic pore throat characteristic parameters and the curves of the reservoir by constant-rate mercury injection test, such as the average pore radius, average throat radius, pore throat radius ratio, maximum throat radius and other parameters.
To investigate the damage mechanism, the particle size distribution was tested to analyze solids damage incorporating the pore throat radius and micro-fracture width in this block.
