This study evaluates the potential for ‘basin-centered style’ gas-trapping within the Tertiary Wasatch and Fort Union and Upper Cretaceous Lance and Mesaverde stratigraphic units within the Hoback Basin, S.W. Wyoming. The area extends from approximately T. 30N, R. 108W (Pinedale area) to T. 40N, R. 116W (Game Hill area). It is an extension of the Green River Basin hydrogeological study and incorporates an additional 341 drillstem test (DST) pressures. Within the Hoback basin, there is good evidence for a basin-centered gas system and a conventional reservoir. The Mesaverde to Tertiary section on the LaBarge platform appears to have a well defined aquifer associated with conventionally trapped gas pools. However, the Lance and Mesaverde reservoirs to the east and north of the LaBarge Platform have the characteristics of a basin-centered system. Also, to the north of the Larbarge North regional aquifer, there is some evidence that the basin-centered gasifer may extend into the Tertiary. DST pressures and recoveries from the Lance indicate gas migration both vertically and laterally from the deeper parts of the basin east towards the crest of the Pinedale Anticline while those from the Mesaverde indicate gas migration from the deeper parts of the basin west toward the Wyoming Thrust. Although the reservoir quality in the deeper parts of the basin-centered gasifer may be low, a major basin-centered gas play may exist in the Hoback Basin that can be developed using current, but innovative, well completion techniques similar to those used at Jonah.