Types of Natural Gas

Shale gas

  • Natural gas that is found trapped within shale formations. Shale formations are very fine grained clastic sedimentary rocks composed of clay, silt and other particulate minerals.

Tight gas

  • Natural gas that is found rocks, such as sandstone, siltstone or limestone which have extremely low permeability.

Coalbed methane

  • A sweet methane gas found in naturally occurring coal seams.

Sweet gas

  • Natural gas with a relatively low concentration of sulfur compounds, such as hydrogen sulfide.

Sour gas

  • Natural gas with a relatively high concentration of sulfur compounds, such as hydrogen sulfide.

Liquified natural gas (LNG)

  • Natural gas (primarily methane) that has been liquefied by reducing its temperature to -260 degrees Fahrenheit at atmospheric pressure

Compressed natural gas (CNG)

  • Natural gas compressed to a pressure at or above 200-248 bar (i.e., 2900-3600 pounds per square inch) and stored in high-pressure containers. It is used as a fuel for natural gas-powered vehicles