· Abstract

· Acknowledgments

· Introduction—Video of Exploration and Production Through Time

· Units of Measure

· Undiscovered Oil and Gas Resources in the Southwestern Wyoming Province

· Undiscovered Gas in the Mesaverde Total Petroleum System

· The Almond Continuous Gas Assessment Unit

· The Rock Springs–Ericson Gas Assessment Unit

· Undiscovered Gas in the Mesaverde–Lance–Fort Union Composite Total Petroleum System

· The Mesaverde–Lance–Fort Union Continuous Gas Assessment Unit

· Undiscovered Gas in the Lewis Total Petroleum System

· The Lewis Continuous Gas Assessment Unit

· Undiscovered Gas in the Hilliard-Baxter-Mancos Total Petroleum System

· The Hilliard-Baxter-Mancos Continuous Gas Assessment Unit

· Undiscovered Gas in the Mowry Composite Total Petroleum System

· The Mowry Continuous Gas Assessment Unit

· Undiscovered Gas in the Lance–Fort Union Composite Total Petroleum System

· The Lance–Fort Union Continuous Gas Assessment Unit

· Reservoirs That Contain the Majority of Undiscovered Gas Resources

· Live Data and Maps

· In Summary

· References Cited

The Almond Continuous Gas Assessment Unit (13.3 TCFG)

The majority of hydrocarbons produced from the Mesaverde TPS at the time of the 2002 USGS assessment have been from marginal marine-bar sandstones in the upper part of the Almond Formation.  These bar sandstones have produced most of the gas from the Almond Continuous Gas AU (Johnson and others, 2005). Figure 5 shows the extent of the Almond Continuous Gas AU, the mean estimate of undiscovered gas and gas liquids in that AU, and wells from the WOGCC. The wells shown have a reservoir name of Almond and a completion date of 2001 or earlier. A 2001 version of a commercial national wells database was used for the 2002 USGS assessment. The publicly available wells shown in figure 5 provide an example of the well data that was available at the time of the assessment.

Figure 5. Almond Formation wells at the time of the assessment (through 2001).

Marginal marine-bar sandstones of the Almond Formation persist a considerable distance west of the Almond Continuous Gas AU, west of the pinch-out of the Lewis Shale. The oil and gas produced from the bar sandstones to the west of the Almond Continuous Gas AU, are from other Mesaverde Group AUs that reside west of the Lewis Shale pinchout, some of which are described further in this document and all of which are described in Johnson and others, 2005, and Finn and others, 2005. Figure 6 shows the same data as in figure 5, but additional wells have been added from the WOGCC wells database to show how drilling of the Almond has progressed to the spring of 2008.

Figure 6. Almond Formation wells as of spring, 2008.

Since the 2002 assessment, 787 additional wells have been completed in Almond Formation reservoirs, 67 of which are shown to have produced from or terminated in Almond coal beds (WOGCC).