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Figure 6 National Petroleum Council 2003 map of future gas resources and off-limits to acreage in North America. Source: http://www.npc.org/reports/NG_Volume _1.pdf. The United States is a highly mature exploration province and new oil sources in conventional traps are difficult to locate onshore where oil and gas leasing has historically been permitted. Unconventional sources (oil from fractured shales, oil sands, coal gas and shale gas) contain significant reserves but require extensive drilling densities to recover. Significant oil also remains to be developed with better field management and advanced production technologies. The largest conventional gas and oil sources will be located primarily in un-explored blocks offshore or in areas currently not accessible in the Rocky Mountains or Alaska. The 2006 US Mineral Management Service estimates 85.9 billion barrels of oil and 419 TCF left to find in offshore areas alone (http://www.mms.gov/revaldiv/PDFs/20 06NationalAssessmentBrochure.pdf). These are probabilistic numbers only. The real value can only be determined through drilling.
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Figure 6 National Petroleum Council 2003 map of future gas resources and off-limits to acreage in North America. Source: http://www.npc.org/reports/NG_Volume _1.pdf. The United States is a highly mature exploration province and new oil sources in conventional traps are difficult to locate onshore where oil and gas leasing has historically been permitted. Unconventional sources (oil from fractured shales, oil sands, coal gas and shale gas) contain significant reserves but require extensive drilling densities to recover. Significant oil also remains to be developed with better field management and advanced production technologies. The largest conventional gas and oil sources will be located primarily in un-explored blocks offshore or in areas currently not accessible in the Rocky Mountains or Alaska. The 2006 US Mineral Management Service estimates 85.9 billion barrels of oil and 419 TCF left to find in offshore areas alone (http://www.mms.gov/revaldiv/PDFs/20 06NationalAssessmentBrochure.pdf). These are probabilistic numbers only. The real value can only be determined through drilling.