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The term effective porosity lacks a single or straightforward definition. Even some of the terms used in its mathematical description ("Vcl” and “Vsh”) have multiple definitions. However, it is most commonly considered to represent the porosity of a rock or sediment available to contribute to fluid flow through the rock or sediment, often flow to a borehole. Porosity that is not considered effective porosity includes water bound to clay particles 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.
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