Global reserves and resources of energy sources

The statistic shows non-renewable energy reserves and resources in 2007 in comparison (in Gt SKE).

Comparison of non-renewable energy reserves and resources 2007 (in Gt SKE)*

raw material classifications	Reserves	Resource
Coal (in total)	711	14,212
Non-conv. natural gas	3	1,988
Conv. oil / natural gas	471	385
Non-conv. Oil	94	357
Nuclear fuel	55	257

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Release date

December 2008

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Region

Worldwide

Survey time period

2007

Supplementary notes

*The abbreviation SKE stands for Steinkohleeinheit or hard coal unit (HCU). According to the source, the following energy source belong to the respective commodity groups:

Non-conventional oil: oil sands / heavy oil and oil shale
Non-conventional natural gas: shale gas/tight gas, coal bed methane (CBM), gas hydrates and aquifers
Coal: hard coal and lignite
Nuclear fuel: uranium and thorium

For uranium, the source uses the following conversion factor: 1t U = 14000t SKE.
For thorium, the same factor has been adopted.

The source distinguishes between "reserves" and "resources" as follows: "Reserves: Quantities of energy sources which were accurately recorded and can be commercially extracted using current technologies Resources: Quantities of energy sources which are either proved but currently not commercially recoverable, or expected on the basis of geological indicators and can be verified by exploration "

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