Abstract
The sequence stratigraphic framework established for the subsurface Barnett Shale in the northern part of the Fort Worth Basin is helping to resolve the age, nature and fill of karst features under the Barnett in the southwestern part of the basin. The southwestern Fort Worth Basin is characterized by absence of the Upper Ordovician Viola Limestone and Simpson Group, which separate the Lower Barnett Shale from the underlying Ordovician Ellenburger Group, as well as the Forestburg Limestone, which separates the Upper and Lower Barnett Shale to the north (Montgomery, 2005). Consequently, the undifferentiated Barnett Shale unconformably overlies the water-bearing Ellenburger Group, and results in a higher risk of water encroachment during stimulation and production of Barnett gas wells.
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