# Absolute Porosity

## Definition - What does Absolute Porosity mean?

Absolute porosity is the percentage or volume of void spaces or porosity of rocks that can contain hydrocarbons. Porosity is the measure of a rock’s ability to hold hydrocarbons, i.e., oil, gas, water, and condensates. Porosity comes from the term “porous” which means tiny holes in sand stones. Porous rocks contain tiny pores, spaces or holes in which oil and gas can be accumulated.

## Petropedia explains Absolute Porosity

There are three important things to be noted in a hydrocarbon bearing reservoir, i.e., porosity, permeability and pressure. Porosity represents the percentage of the pores or void spaces in sandstones whereas absolute porosity represents the percentage or volume of pores available in various samples of rocks which can store hydrocarbons. In mathematical terms porosity can be expressed as open voids in sandstone rocks divided by the total rock volume. The total rock volume is equal to the solid volume of rock and porous volume of the rock. A sandstone rock generally has 8% porosity which means that 92% of its portion is solid rock and only 8% has the void spaces. However, if a rock has 8% porosity, it is considered to be an economic deal for the operators and E&P organizations and can be developed into a decent hydrocarbon reservoir.