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==Reservoir Permeability==
 
==Reservoir Permeability==
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[[File:Average permeability.jpg|300px|thumbnail|right|Figure 1- Average permeability for various producing fields on the UK and Norwegian continental shelves. (Gluyas et al. 2004; from Spencer et al. 1987; Abbots 1991; Gluyas et al. 1992; Oxtoby et al. 1995).]]
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[[File:Average permeability.jpg|300px|thumbnail|right|{{figure number|1|}}Average permeability for various producing fields on the UK and Norwegian continental shelves. (Gluyas et al. 2004; from Spencer et al. 1987; Abbots 1991; Gluyas et al. 1992; Oxtoby et al. 1995).]]
    
Permeability is an intrinsic property of a material that determines how easily a fluid can pass through it. In the petroleum industry, the Darcy (D) is the standard unit of permeability, but milidarcies (1 mD = 10-3 D) are more commonly used. A Darcy is defined as a flow rate of 10-2 ms-1 for a fluid of 1 cp (centipoise) under a pressure of 10-4atm m-2. Permeability in reservoir rocks may range from 0.1 mD to more than 10 D.<ref name=gluyas2004 />
 
Permeability is an intrinsic property of a material that determines how easily a fluid can pass through it. In the petroleum industry, the Darcy (D) is the standard unit of permeability, but milidarcies (1 mD = 10-3 D) are more commonly used. A Darcy is defined as a flow rate of 10-2 ms-1 for a fluid of 1 cp (centipoise) under a pressure of 10-4atm m-2. Permeability in reservoir rocks may range from 0.1 mD to more than 10 D.<ref name=gluyas2004 />

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