page_title: Effective porosity
section_title: Background for multiple definitions
hierarchical_section_title: Effective porosity / Background for multiple definitions
caption_attribution_description: English: Author: c/o Meranti (Tony Kennaird) Source URL: http://www.feswa.org/PPPEDIA/Effective_porosity.htm
context_page_description: 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 and isolated "vuggy" porosity. 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 have multiple definitions.
caption: The components of the gross rock (bulk) volume as a strip. The individual components are not to scale. For example, porosity and pore volume are over-emphasised for illustrative purposes. Adapted from Eslinger and Pevear[1]
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