Fundamentals of Rock Properties – Readyzone

Fundamentals of rock properties


The porosity of a rock is a measure of the storage capacity (pore volume) that is capable of holding fluids. Quantitatively, the porosity is the ratio of the pore volume to the total volume (bulk volume).

There are two types of porosity:

  1.  Absolute porosity
  2. Effective porosity


Saturation is defined as that fraction, or percent, of the pore volume occupied by a particular fluid (oil, gas, or water).


Wettability is defined as the tendency of one fluid to spread on or adhere to a solid surface in the presence of other immiscible fluids. The tendency of a liquid to spread over the surface of a solid is an indication of the wetting characteristics of the liquid for the solid.

Capillary pressure

When two immiscible fluids are in contact, a discontinuity in pressure exists between the two fluids, which depends upon the curvature of the interface separating the fluids.



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