Development
Jonah Field is known for being one of the largest on-shore natural gas discoveries in the USA in the early 1990s. The startling fact is that Jonah has a surface area of approximately one township yet it contains 10.5 trillion cubic feet (300 km3) of gas. In comparison, the Hugoton Field covers most of the southwest portion of Kansas, a 14 county area, yet it contained only about three times the volume of gas in Jonah.
The principal technical challenge in Jonah is identification and stimulation of productive intervals in a 3,000 ft (910 m) to 3,500 ft (1,100 m) section of stacked lenticular fluvial sand/silt/shale sequences which comprise the Upper Mesaverde, Lance, and Unnamed Tertiary formations. Hydraulic fracturing is used to open (stimulate) the tight sand formations that exist more than 1.5 miles (2.4 km) underground, which allows gas to be recovered at economic rates.
The major gas companies currently developing the field are the EnCana Corporation and BP. Other active gas companies involved in the Jonah Field include Ultra Petroleum and Yates Petroleum.
Other large natural gas fields in and around Sublette County, Wyoming include the Pinedale Anticline, the Wamsutter gas field and several sour gas H2S fields operated by ExxonMobil.
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