1. n. []
A discrete void within a rock, which can contain air, water, hydrocarbons or other fluids. In a body of rock, the percentage of pore space is the porosity.
See: connate water, dirty, effective porosity, formation pressure, formation water, fracture, fracture porosity, groundwater, interstitial water, moldic porosity, normal pressure, permeability, porosity, saturation, stylolite, vug, weathered layer