Types of porosity

(i) Total porosity : Total porosity is defined as the fraction of the bulk rock volume V that is not occupied by solid matter. 

(ii) Connected porosity: The ratio of the connected pore volume to the total volume. 

(iii) Effective porosity: The same as the connected porosity. 

(iv) Primary porosity: The porosity of the rock resulting from its original depositional structure. 

(v) Secondary porosity: The porosity resulting from diagenesis. 

(vi) Microporosity: The porosity resident in small pores (< 2 mm) commonly associated with detrital 

and authigenic clays. 

(vii) Intergranular porosity: The porosity due to pore volume between the rock grains. 

(viii) Intragranular porosity: The porosity due to voids within the rock grains. 

(ix) Dissolution porosity: The porosity resulting from dissolution of rock grains. 

(x) Fracture porosity: The porosity resulting from fractures in the rock at all scales. 

(xi) Intercrystal porosity: Microporosity existing along intercrystalline boundaries usually in carbonate rocks. 

(xii) Moldic porosity: A type of dissolution porosity in carbonate rocks resulting in molds of original grains or fossil remains. 

(xiii) Fenestral porosity: A holey (‘bird’s-eye’) porosity in carbonate rocks usually associated with algal mats. 

Fenestral porosity

(xiv) Vug porosity: Porosity associated with vugs, commonly in carbonate rocks.

Outcrop of Vuggy Porosity

  

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