Types of natural gas deposits: Difference between revisions
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<onlyinclude>'''Natural gas''' can be contained in a variety of different types of '''deposits''' that must be accessed if the natural gas is to be used. </onlyinclude>According to the Canadian Association of Petroleum Producers ([http://www.capp.ca/Pages/default.aspx CAPP])<ref name=CAPP>CAPP 2012 Upstream Dialogue: The Facts on Natural Gas</ref>, Canada has a [[natural gas reserve]] of between 700 and 1,300 [[trillion cubic feet]]. While a little over 15% of that [[natural gas]] has been recovered, the rest is contained in four types of deposits: [[conventional natural gas deposit|conventional]], and the so called unconventional deposits: [[Shale gas deposit|shale gas]], [[Tight gas deposit|tight gas]], and [[coalbed methane]]. | <onlyinclude>'''Natural gas''' can be contained in a variety of different types of '''deposits''' that must be accessed if the natural gas is to be used. </onlyinclude>According to the Canadian Association of Petroleum Producers ([http://www.capp.ca/Pages/default.aspx CAPP])<ref name=CAPP>CAPP 2012 Upstream Dialogue: The Facts on Natural Gas</ref>, Canada has a [[natural gas reserve]] of between 700 and 1,300 [[trillion cubic feet]]. While a little over 15% of that [[natural gas]] has been recovered, the rest is contained in four types of deposits: [[conventional natural gas deposit|conventional]], and the so called unconventional deposits: [[Shale gas deposit|shale gas]], [[Tight gas deposit|tight gas]], and [[coalbed methane]]. | ||
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==Shale gas== | ==Shale gas== | ||
[[Shale gas]] is natural gas found inside a fine-grained | [[Shale gas]] is natural gas found inside a fine-grained sedimentary rock called shale. Shale is porous (there are lots of tiny spaces inside it), but it is non-permeable, which means the gas cannot flow through it. Shale gas requires the use of [[hydraulic fracturing]] for extraction. | ||
==Tight gas== | ==Tight gas== | ||
Revision as of 23:52, 28 August 2015
Natural gas can be contained in a variety of different types of deposits that must be accessed if the natural gas is to be used. According to the Canadian Association of Petroleum Producers (CAPP)[1], Canada has a natural gas reserve of between 700 and 1,300 trillion cubic feet. While a little over 15% of that natural gas has been recovered, the rest is contained in four types of deposits: conventional, and the so called unconventional deposits: shale gas, tight gas, and coalbed methane.
Natural gas has been extracted from conventional natural gas deposits for a long time, the unconventional resources are resources that are being extracted using substantially new techniques. Please see conventional vs unconventional resources.
Conventional natural gas deposits
Conventional resources are "pockets" of gas contained within relatively porous rock, and they are the most easily mined. While hydraulic fracturing has allowed for more expansive access to these deposits, they can be mined without its use.
Coalbed methane
Coalbed methane is natural gas consisting mostly of methane, which is trapped inside coal seams. This is extracted while the coal is being mined, as diminishing the pressure in the coal seam allows the gas to flow out of the seam and into a wellbore, where it is extracted.[1]
Shale gas
Shale gas is natural gas found inside a fine-grained sedimentary rock called shale. Shale is porous (there are lots of tiny spaces inside it), but it is non-permeable, which means the gas cannot flow through it. Shale gas requires the use of hydraulic fracturing for extraction.
Tight gas
Tight gas is similar to shale gas in that it is trapped inside a porous, non-permeable reservoir rock. The only differentiation between the two is that the term tight gas includes natural gas trapped inside reservoir rocks that are not shale.