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BAKER HUGHES - Drilling Fluids Reference Manual

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RESERVOIR APPLICATION FLUIDS<br />

Figure 6 - 2<br />

Sedimentary Rock Nomenclature<br />

Porosity and Permeability<br />

A good understanding of the morphology and genesis of pores, prediction and detection within the<br />

earth’s crust is imperative to the petroleum industry. Porosity and permeability are related<br />

properties of any rock or loose sediment.<br />

Porosity of a rock is a measure of its voids and ability to hold a fluid.<br />

Total porosity is the total volume of void space expressed as a percentage of total volume of rock.<br />

Porosity (Ø)<br />

= 100<br />

bulk volume − grain volume<br />

bulk volume<br />

Effective porosity is the percentage of interconnected pore space.<br />

<strong>BAKER</strong> <strong>HUGHES</strong> DRILLING FLUIDS<br />

REFERENCE MANUAL<br />

REVISION 2006 6-4

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