Definition - What does Permeable mean?

Permeable is the ability of a material to allow gas or liquid to flow through it. It is related to Permeability which is a measure of connectivity between pore spaces and the ease with which the fluid flows through the connecting pore spaces of the rock. Every formation rock has pore spaces in which oil or gas or water is trapped. Permeability is an important measure to understand a reservoir's production capability or recovery of hydrocarbon from a reservoir.

Petropedia explains Permeable

If a rock is highly permeable it will allow fluids to move rapidly through it. The permeability of a rock is affected by the pressure in the rock. The Permeability values for tight formations like shale and silt stones will be few micro darcies, while the one for the formations where flows fluid readily such as sandstones, sand and limestone will vary from one milli darcy’s to fifty Darcie’s for the hydraulic fractured rocks.

  • Permeability depends on various factors like:
  • The grain size, shape and its distribution.
  • The type of formation.
  • Porosity of the formation.
  • Pressure and type of fluid in formation.
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