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Unconventional gas is
natural gas Natural gas (also called fossil gas or simply gas) is a naturally occurring mixture of gaseous hydrocarbons consisting primarily of methane in addition to various smaller amounts of other higher alkanes. Low levels of trace gases like carbo ...
obtained from sources of production that are, in a given era and location, considered to be new and different when compared with conventional gas. Sources that are at times considered to be unconventional include the following: * Coalbed methane * Methane clathrate (gas hydrate) *
Shale gas Shale gas is an unconventional natural gas that is found trapped within shale formations. Since the 1990s a combination of horizontal drilling and hydraulic fracturing has made large volumes of shale gas more economical to produce, and some ...
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Synthetic natural gas Substitute natural gas (SNG), or synthetic natural gas, is a fuel gas (predominantly methane, CH4) that can be produced from fossil fuels such as lignite coal, oil shale, or from biofuels (when it is named bio-SNG) or using electricity with power- ...
, such as
oil shale gas Oil shale gas (also: retort gas or retorting gas) is a synthetic non-condensable gas mixture (syngas) produced by oil shale thermal processing (pyrolysis). Although often referred to as shale gas, it differs from the natural gas produced from shale ...
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Tight gas Tight gas is natural gas produced from reservoir rocks with such low permeability that massive hydraulic fracturing is necessary to produce the well at economic rates. This natural gas is trapped within rocks with very low permeability, in other ...
As noted by the International Energy Agency (IEA) in 2013 regarding unconventional oil, what is conventional vs. unconventional changes over time as technologies and economies change. (see als
IEA 2013
 Certainly, this applies to unconventional gas as well. Natural gas, whether conventionally produced or not, has been considered to be an unconventional source for oil production.


References

Fuel production Broad-concept articles {{Energy-stub