Tight gas

While shale gas is natural gas extracted from rock shale, tight gas describes natural gas that is dispersed within low-porosity silt or sand areas. Tight gas is defined in the U.S. as having less than 10 percent porosity and less than 0.1 millidarcy permeability. Tight gas is held in pores up to 20,000 times narrower than a human hair.

In general, the same drilling and completion technology used with shale gas - fracking - is also used to access and extract tight gas.

Related SourceWatch articles

 * Fracking
 * Shale gas
 * Coalbed methane
 * Coal plant conversion projects
 * Energy in Depth
 * Fracking
 * Marcellus Shale
 * Natural gas
 * Natural gas transmission leakage rates
 * West Virginia and coal

State-by-state fracking profiles
Click on the map below for state-by-state information on fracking:

External Resources
''Wikipedia also has an article on natural gas. This article may use content from the Wikipedia article under the terms of the GFDL.''