Vertical proportion curves to capture the global vertical facies variability for a whole area (a section, for instance) and.
Local facies curves to capture the local facies variability at each well location.
Pay facies consist of single and multistory channels.įacies geometry was characterized using three methods to capture different scales and variability across each area: Most of the production comes from overpressured and ultra tight Lance Sandstones.Ĭharacterizing the facies geometry focused on identifying pay and nonpay facies using core and well log data. The studies included: Detailed Petrophysical modeling for minerals, effective porosity and fluid saturations Well-and seismic-based interpretations of internal markers within the Lance formation Calibrating with cores and thin section images Generating log-based vertical facies proportion curves Generating a facies probability cube based on log facies and seismic information and constructing an integrated 3-D geomodel.įigure 1 : Jonah Field: location and study areasįigure 1 shows the locations of the three study areas at Jonah Field. The reservoir characterization and simulation work focused on three sections within the main field area.ĭetailed geomodels were built for each section, from which reservoir simulation models were then extracted. To evaluate infill well development in various sections of the Jonah Field, reservoir characterization and simulation studies were performed to integrate geology, Petrophysics, 3-D seismic and engineering data into technically sound 3-D geologic and engineering models. The field is defined by the intersection of two sub-vertical shear fault zones that form a wedge-shaped structural block. The Jonah Field in the Green River Basin in Sublette County, Wyoming is one of the most prolific natural gas fields in the Rocky Mountain region, estimated to contain up to 15 trillion cubic feet of natural gas in a 32 square mile productive area.