GEOLOGY

Detailed explanation-1: -The porosity of the aquifer is the volume of void space to the total volume, typically expressed as a percentage. Effective porosity is the space available for fluid to flow, and is calculated as the volume of interconnected void space to the total volume, typically given as a percentage.

Detailed explanation-2: -Porosity is the percentage of void space in a rock. It is defined as the ratio of the volume of the voids or pore space divided by the total volume. It is written as either a decimal fraction between 0 and 1 or as a percentage. For most rocks, porosity varies from less than 1% to 40%.

Detailed explanation-3: -The low-value porosity zone refers to the zone where porosity is lower than the lower limit of the effective reservoir on the depth-porosity plot (Fig. 5.7B, Zone A). The high-value zone is where the porosity in the depth-porosity plot lies between the lower limit and maximum normal porosity (Fig.

Detailed explanation-4: -Water-filled pore space (WFPS) is the ratio of volumetric soil water content to total soil porosity. A soil’s WFPS is determined simply from its bulk density and moisture content, because particle and water densities are stable at  2.6 and 1 kg/l respectively. Preferred Units: percent. Scope Note: N/A.

Detailed explanation-5: -The principal factors that control porosity are grain size and shape, the degree of sorting (a well-sorted sediment has a narrow range of grain size), the extent to which cement occupies the pore spaces of grains and the amount of fracturing.