Figure 1. Commercial gas shale production in North America is currently limited to the Michigan (Antrim Shale), Appalachian (Ohio Shale and equivalents), Illinois (New Albany Shale), San Juan (Lewis Shale) and Fort Worth basins (Barnett Shale). Numerous other basins with prospective shale gas exist, many of which are currently being explored (modified from Faraj et al., 2004).

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