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Home Petroleum Corporation drilled two wells in 1986 and 1987 to test the concept of a large, basin-centered gas accumulation in the Upper Cretaceous Lance Formation in a remote portion of the northern Green River basin. Although these first wells had excellent shows of gas and calculated log pay, the reservoir sandstones had extremely low permeability. Unfortunately for Home, fracture-stimulation techniques used in the late 1980s were unable to unlock this vast gas resource. In 1991, John Martin at McMurry Oil Company recognized the potential of the play and quietly amassed a controlling interest in the area. McMurry Oil and their partners brought the appropriate drilling and completion technology into the project, an effort that resulted in the ‘‘rediscovery’’ of Jonah field. Jonah field will ultimately have more than 350 producing wells and is poised to become the next multi-tcf gas field in the Rocky Mountain region. The rediscovery of Jonah field ignited interest in structurally trapped, tight-gas exploration in Upper Cretaceous strata and may stand as an analog for further exploration of vast, sparsely drilled areas of the Rocky Mountain region.

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