6ROGNER H H. An assessment of world hydrocarbon resources[J]. Annual Review of Energy and Environment, 1997(22) :217-262.
7U. S. Energy Information Administration. World Shale Gas Resources:An Initial Assessment of 14 Regions Outside the United States[-EB/OL]. (2011-04-05) [-2011-04-06 ] http :// www. eia. gov/analysis/studies/worldshalegas/.
8U. S. Energy Information Administration. Annual Energy Outlook 2011 [EB/OL]. (2011-04-26) http://www, eia. gov/forecasts/aeo/.
