Kair

Definition: 
Air Permeability
Subject Area 1: 
Reservoir Engineering & Reservoir Management
Remarks: 
Permeability measured with a single fluid in the rock is called absolute or intrinsic permeability (Ka). It is often measured using dry air, giving rise to the term "air permeability" (Kair). Nitrogen and carbon dioxide are also used. When water is used as the single fluid, the result is called "liquid permeability" (Kliq). Air perm is usually a little higher than liquid perm. The Klinkenberg correction is used to reduce air perm to an equivalent liquid perm.