Effective porosity is most commonly considered to represent the porosity of a rock or sediment available to contribute to fluid flow through the rock or sediment, or often in terms of "flow to a borehole". Porosity that is not considered "effective porosity" includes water bound to clay particles (known as bound water) and isolated "vuggy" porosity (vugs not connected to other pores). The effective porosity is of great importance in considering the suitability of rocks or sediments as oil or gas reservoirs, or as aquifers.
The term lacks a single or straightforward definition. Even some of the terms used in its mathematical description ("” and “”) have multiple definitions.
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Effectiveporosity is most commonly considered to represent the porosity of a rock or sediment available to contribute to fluid flow through the rock or...
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...
increasing effectiveporosity and increasing with an increasing effective confining stress. This means that a sonic log can be used to calculate the porosity, confining...
as in a sponge. However, there is also a concept of closed porosity and effectiveporosity, i.e. the pore space accessible to flow. Many natural substances...
velocity. Brazil nut effect Characterisation of pore space in soil Effectiveporosity Density meter Number density Buckman, Harry O.; Brady, Nyle C. (1960)...
which can range from 0 (completely dry) to the value of the materials' porosity at saturation. It can be given on a volumetric or mass (gravimetric) basis...
Specific yield, also known as the drainable porosity, is a ratio, less than or equal to the effectiveporosity, indicating the volumetric fraction of the...
for porosity because some water will remain in the medium even after drainage due to intermolecular forces. Often the porosity or effectiveporosity is...
field of formation evaluation, porosity is one of the key measurements to quantify oil and gas reserves. Neutron porosity measurement employs a neutron...
Porosity sealing is done through the process of vacuum impregnation. Vacuum impregnation is a preferred OEM process that seals porosity and leak paths...
n} is the number of core samples, ϕ {\displaystyle \phi } is the effectiveporosity, V b {\displaystyle Vb} is the bulk volume of sample, and P c {\displaystyle...
permeability and less than ten percent matrix porosity. Although shales have low permeability and low effectiveporosity, shale gas is usually considered separate...
the burrowing action of worms and crustaceans at the seafloor. The effectiveporosity, or the amount of water that is capable of being recovered, of the...
oil that can move or be "produced" (i.e. effectiveporosity). While the magenta line indicates the toral porosity, meaning that it includes the water that...
identification of specific clay minerals is also useful for calculating the effectiveporosity of reservoir rock. Gamma ray logs are also used in mineral exploration...
type logs where resistivity logs and porosity logs were recorded in one pass in the borehole. The two types of porosity logs (acoustic logs and nuclear logs)...
those lacking salt. Rock salt has an effectiveporosity of nearly 50% on the surface, while the effectiveporosity decreases to less than 10% at a depth...
similar to pumice powder, and has a low density as a result of its high porosity. The typical chemical composition of oven-dried diatomaceous earth is 80–90%...
_{\text{accumulation}}} Where ϕ {\displaystyle \phi } represents the effectiveporosity of the medium, x {\displaystyle {\boldsymbol {x}}} and t {\displaystyle...
be an effective model for mitigating Kirkendall porosity. Controlling annealing temperature is another method of reducing or eliminating porosity. Kirkendall...
is the tortuosity (dimensionless). The transport-available porosity equals the total porosity less the pores which, due to their size, are not accessible...
Hydrogen gas porosity is an aluminium casting defect in the form of a porosity or void in an aluminium casting caused by a high level of hydrogen gas...
Pore structure is a common term employed to characterize the porosity, pore size, pore size distribution, and pore morphology (such as pore shape, surface...
services such as crop production, are texture, structure, bulk density, porosity, consistency, temperature, colour and resistivity. Soil texture is determined...
hydrology Dagan G., A method of determining the permeability and effectiveporosity of unconfined anisotropic aquifers, Water Resour. Res., 3 (4), 1059–1071...
in materials science and in soil science, and is closely related to the porosity (often noted as ϕ {\displaystyle \phi } , or η {\displaystyle {\eta }}...
pre-existing pores, reducing porosity. Clay minerals are phyllo-silicate, in other words, with sheet-like structure. They are effective agents that block fluid...
a paper machine from the wood pulp. The paper is microcrepped to give porosity and elasticity. Microcrepping is done by drying with loose draws allowing...
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