Global natural gas reserves (conventional and unconventional)
The Reserves-to-Production (R/P) ratio in years represents the availability of a non-renewable resource under current technical and economic conditions.
Estimated reserves cover unconventional natural gas deposits (see the Glossary), but also conventional natural gas deposits that are inoperable today with existing technologies.
Sources: World Energy Outlook, IEA 2020
Unconventional gas represents more than half of estimated resources, in particular in the United States where the sector has allowed the country to reduce its energy dependency rate. Also it can be noted that reserves in Asia Pacific and Europe - Eurasia, are thought to be larger than the North American reserves.
The R/P ratio is approximately 56 years, taking proven resources into account only. With estimated resources, the total comes to 198 years.