Places where fluids collect are called reservoirs.[1] The most common fluids found in reservoirs are water, hydrocarbons, and gas. Reservoirs can be natural or artificial (human-made). Examples of natural reservoirs include hydrocarbon reservoirs in rock formations (Figure 1) and water reservoirs that occur behind naturally occurring dams. Artificial dams mostly involve water, such as the reservoirs behind hydroelectric dams (Figure 2).[2]

Within energy science the word reservoir usually refers to either:

For Further Reading


  1. See for example the Oxford English Dictionary, accessed Aug. 21st, 2018.
  2. Petroleum Geology: Chapter 8 The Nature of Petroleum Reservoirs. R.E. Chapman, 1983, V.16. Accessed: Oct 7, 2018. Available from:
  3. "Example of a Multiple Lease Unit with Wells Developing a Conventional Gas Reservoir", Flickr, 2018. [Online]. Available: [Accessed: 15- Aug- 2018].
  4. Wikimedia Commons. (September 1, 2015). Hoover Dam [Online]. Available:

Authors and Editors

Bethel Afework, Jaafer Khani, Rudi Meyer, Ashley Sheardown, Kailyn Stenhouse, Jasdeep Toor, Jason Donev
Last updated: January 4, 2019
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