Active U.S. Shale Gas Plays

Technically recoverable resources— The total amoimt of resource, discovered and undiscovered, that is thought to be recoverable with available technology, regardless of economics. 

Original gas-in-place—The entire volume of gas contained in the reservoir, regardless of the ability to produce it. 

Cenozoic ( Age of Recent Life ) 65 million years ago to Present 

Source Adapted from USGS, The Geologic Time Scale, U.S. Geologic Service, Washington, DC, 2008 (http //vulcan.wr.usgs.gov/Glossary/geo  

Infill drilling is used to increase the production rate by drilling between producing wells in an established field. 

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