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Porosity or void fraction is a measure of the void (i.e. "empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and 100%.
"Clay layers" are dry clay (V cl) which also form part of the grain volume.If a core sample is dried in a normal dry oven (non-humidified atmosphere) the clay layers and quartz together form the grain volume, with all other components constituting core analysis “total porosity” (notwithstanding comments in [2]).
Gas porosity is the fraction of a rock or sediment filled with a gas.. Determining the true porosity of a gas filled formation has always been a problem in the oil industry. . While natural gas is a hydrocarbon, similar to oil, the physical properties of the fluids are very different, making it very hard to correctly quantify the total amount of gas in a formati