Effective porosity excludes isolated pores and pore volume occupied by water adsorbed on clay minerals or other grains. Total porosity is the total void space in the rock whether or not it contributes to fluid flow.

How do you calculate total porosity?

Porosity = ( ( Total Volume – Volume of the Solid ) / Total Volume ) x 100%. A larger percentage means that the rock has the ability to hold more water.

How do you define porosity?

Porosity is defined as the ratio of the volume of pores to the volume of bulk rock and is usually expressed as a percentage.

What are the four types of porosity?

Four basic porosity types can be recognized in sandstones: (1) intergranular (primary), (2) microporosity, (3) dissolution (secondary), and (4) fracture (Figure 2).

What are signs of low porosity hair?

Signs Of Low Porosity Hair

  • Your hair struggles to keep moisture.
  • Your hair doesn’t work with conditioners.
  • You need heat to activate conditioners.
  • There’s always buildup and dirt in your hair.
  • You get more dandruff (clarifying dandruff shampoos for Afro hair)
  • Your hair is too oily or too dry.
  • You spend ages drying your hair.

What’s the difference between total porosity and effective porosity?

Porosity is further classified as total porosity and effective porosity. Total porosity is defined as the ratio of the entire pore space in a rock to its bulk volume. Effective porosity is the total porosity less the fraction of the pore space occupied by shale or clay. In very clean sands, total porosity is equal to effective porosity.

How to calculate the porosity of a solid?

Porosity = (Volume of Voids / Total Volume) x 100%. The second equation uses the total volume and the volume of the solid. Porosity = ( ( Total Volume – Volume of the Solid ) / Total Volume ) x 100%. A larger percentage means that the rock has the ability to hold more water. To unlock this lesson you must be a Study.com Member.

How to describe the porosity of a rock?

Expressed in terms of symbols, Eq. (1.1) is represented as: In Eq. (1.2), f = porosity; Vp = pore volume; and VB = bulk volume. Pore volume is the total volume of pore spaces in the rock, and bulk volume is physical volume of the rock, which includes the pore spaces and matrix materials (sand and shale, etc.) that compose the rock.

What is the total porosity of clay free sand?

where phiT is the total porosity of clean (clay free) sand and Vd is the volume of dispersed clay in the sand pore space expressed as a fraction of the bulk volume.