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The porosity is a measure of the total pore space in the soil. This is defined as a fraction of volume often given in percent. The amount of porosity in a soil depends on the minerals that make up the soil and on the amount of sorting occurring within the soil structure.
Connected porosity is more easily measured through the volume of gas or liquid that can flow into the rock, whereas fluids cannot access unconnected pores. Porosity is the ratio of pore volume to its total volume. Porosity is controlled by: rock type, pore distribution, cementation, diagenetic history and composition. Porosity is not controlled ...
Porosimetry is an analytical technique used to determine various quantifiable aspects of a material's porous structure, such as pore diameter, total pore volume, surface area, and bulk and absolute densities. The technique involves the intrusion of a non-wetting liquid (often mercury) at high pressure into a material through the use of a ...
Φ T = Total porosity (PHIT), which includes the connected and not connected pore throats. Φ e = Effective porosity which includes only the inter-connected pore throats. V b = bulk volume of the rock. Key equations: V ma + V cl + V fw + V hyd = 1 Rock matrix volume + wet clay volume + water free volume + hydrocarbon volume = bulk rock volume [20]
In the vast majority of cases, this core analysis and Petroleum Engineering definition of effective porosity equates to total porosity. Effective porosity ϕ e 2 {\displaystyle \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 ...
NMR cryoporometry [1] [2] [3] is a recent technique for measuring total porosity and pore size distributions. NMRC is based on two equations: the Gibbs–Thomson equation, which maps the melting point depression to pore size, and the Strange–Rahman–Smith equation, [1] which maps the melted signal amplitude at a particular temperature to ...
Gassmann fluid substitution requires that the porosity remain constant. The assumption being that, all other things being equal, different saturating fluids should not affect the porosity of the rock. This does not take into account diagenetic processes, such as cementation or dissolution, that vary with changing geochemical conditions in the ...
Poromechanics is a branch of physics and specifically continuum mechanics that studies the behavior of fluid-saturated porous media. [1] A porous medium or a porous material is a solid, constituting the matrix, which is permeated by an interconnected network of pores or voids filled with a fluid.