| Summary |
The Ramsey Gas Field of Fayette and Nicholas Counties, West Virginia, produces from the Ravencliff sandstones of the Upper Mississippian Hinton Formation. One hundred-fourteen wells, each with either geophysical logs, production data and/or drillers' reports, provide the necessary information to construct maps, cross sections and various graphical and statistical representations used to interpret the stratigraphy and structure within the field and to characterize the production. The Ravencliff interval is composed of stacked, linear, northeast-southwest trending sandstone bodies interbedded with shales representing cyclic deposition in an incised valley system. As a result of the heterogeneous sandstone geometry, production from the Ramsey Gas Field is controlled by the presence of porous zones and permeability barriers, such as the interbedded shale. High porosity zones within the sandstone bodies, that range in thickness from zero to more than 60 feet with average thickness in the 10 to 30 feet range, are generally found vertically in the center/middle of the sandstone body. Four transgressive-regressive cycles are recognized. Log porosities of the sandstones range from 5 to 16 percent. There is no apparent relationship between sandstone thickness and porosity, however, statistical analysis indicates a slight positive correlation between net sandstone thickness, porosity, initial potential and producing zone thickness. From the discovery of the field in 1976, more than 17,000,000 mcf of gas have been produced. Production decline curves indicate that gas is depleted significantly within six years after completion. Prediction of success is difficult due to reservoir heterogeneity. |
