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Chapter 5: Porosity

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Formation Evaluation MSc Course Notes PorosityDr. Paul Glover Page 43Chapter 5: and DefinitionTotal Porosity is defined as the fraction of the bulk rock volume V that is not occupied bysolid matter. If the volume of solids is denoted by Vs, and the pore volume as Vp = V - Vs, wecan write the Porosity as: ===V-VVVVPoreVolumeTotalBulkVolumesp( )The Porosity can be expressed either as a fraction or as a percentage.

surface area of the grains. The specific surface area (exposed grain surface area per unit solid volume) is inversely proportional to grain size. This indicates that, when all other factors are equal, a given weight of coarse grains will be stabilised at a lower porosity than the same weight of finer grains. For a sedimentary rock

  Surfaces, Area, Porosity, Surface area

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