In essence, total porosity minus shale water, where solid minerals and the volume of shale ( Vsh ) constitute the matrix ( non-effective porosity ) and the remaining volume constitutes the effective porosity.
22.
Typically, the majority of groundwater ( and anything dissolved in it ) moves through the porosity available to flow ( sometimes called effective porosity ) . "'Permeability "'is an expression of the connectedness of the pores.
23.
"' Effective porosity "'is most commonly considered to represent the porosity of a rock or sediment available to contribute to fluid flow through the rock or sediment, or often in terms of " flow to a borehole ".
24.
This capillary water forms the irreducible water saturation ( Swi ) with respect to effective porosity ( notwithstanding the inclusion of microporous water as V sh during the log analysis ) whereas for total porosity, the CBW and capillary water combined form the Swi .
25.
;Effective porosity \ phi _ { e2 } : Effective porosity measured on core samples which are dried in a humidity oven so that clays retain one or two molecular layers of bound water however, this CBW tends to a minimum and is likely not reservoir representative.
26.
;Effective porosity \ phi _ { e2 } : Effective porosity measured on core samples which are dried in a humidity oven so that clays retain one or two molecular layers of bound water however, this CBW tends to a minimum and is likely not reservoir representative.
