|This article is part of the FrackSwarm coverage of fracking.|
Shale gas is natural gas extracted from rock shale. Shale gas is one of a number of "unconventional" sources of natural gas; other unconventional sources of natural gas include coalbed methane, tight gas, and gas hydrates.
Shale has low matrix permeability, so oil and gas companies create fractures for permeability. Shale gas has been extracted for years from shales with natural fractures; the shale gas boom in recent years has been due in part to technology in hydraulic fracturing (fracking) to create extensive artificial fractures around well bores.
Gas in rocks with a permeability of <0.1md have been classified as unconventional, although more recently the National Petroleum Council (NPC) has defined unconventional gas as "natural gas that cannot be produced at economic flow rates nor in economic volumes unless the well is stimulated by a large hydraulic fracture treatment, a horizontal wellbore, or by using multilateral wellbores or some other technique to expose more of the reservoir to the wellbore."
For more see Shale gas and oil reserves
Shale gas appears to have high initial production rates but then steeper decline rates than conventional gas wells, and there is a high degree of variability within shale plays; how and whether this is accounted for can affect total reserve estimates.
High shale resource assessments in the US have been driven in part by the relaxation of how gas reserves are estimated for financial reporting purposes, enabling companies to overstate reserves, and issue debt and stock against those overstatments. The overstatement of shale gas reserves has been augmented by gas industry ads and PR campaigns, often carried out by gas industry front groups, such as Energy in Depth, as well as the funding of academic research by oil and gas companies, what has been called frackademia.
According to the U.S. Energy Information Administration (EIA), U.S. shale gas production has increased fourteen-fold from 2002 to 2012; as of 2012, shale gas accounts for 22% of U.S. gas production and 32% of total remaining recoverable gas resources in the United States. By 2030, EIA projects that shale gas will represent 14% of total global gas supplies, and has launched the "Global Shale Gas Initiative" (GSGI) to help facilitate this projection.
- ↑ Dan Jarvie, "Worldwide shale resource plays," PDF file, NAPE Forum, August 26, 2008.
- ↑ K. Perry and J. Lee, "Topic Paper #29: Unconventional Gas," National Petroleum Council, 2007.
- ↑ David Hughes, "Will Natural Gas Fuel America in the 21st Century?" Post Carbon Institute, 2011.
- ↑ Chris Nelder, "Is there really 100 years’ worth of natural gas beneath the United States?" Slate, Dec 29, 2011.
- ↑ "Global Shale Gas Initiative (GSGI)" U.S. Energy Information Administration, accessed January 2012.
- CERA - collection of market and industry reports
- DOE/EIA EIA Natural Gas Weekly Update - current NG prices and market analysis
- Natural Gas Media- Natural Gas News and Analysis for Investment and Trading
- "The Implications of Lower Natural Gas Prices for Electric Generators in the Southeast," U.S. Energy Information Administration, May 2009
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