Porosity and permeability of Rock
written by Black jack 007
at Monday, February 25, 2008
1. Porosity ( %) is ( volume of void/ total volume of rock ) x 100
origin of porosity is :
a. Primary porosity = space beween individual mineral grains or crhystalls ; present when rock formed
a.1 intergranular porosity
b Secondary porosity = created after rock formed by frackturing dissolution.
a. intercrystalin
b. Solution
c. Fracture
2. Permeabilty Rock
a. Measure of how easily fluid can move through rock
b. depends only on rock properties " intrinsic permeability "
c. in oil industry, permeability is measured in darcies or milidarcies
