Characteristics of discrete and basin-centered parts of the Lower Silurian regional oil and gas accumulation, Appalachian basin: Preliminary results from a data set of 25 oil and gas fields
U.S. Geological Survey Open-File Report 98-216
Appendix R
Mantua/Shalersville gas field (Ma/Sh)
| Location: | Portage (Mantua and Shalersville Twps.) County, Ohio |
| Discovery date: | 1961 |
| Depth (ft): | ~4,200 |
| Hydrocarbon type and GOR: | Gas and associated oil |
| Structural setting: | Regional southeast-dipping homocline |
| Stratigraphic name of reservoir: | "Clinton" sands |
| Trap: | Stratigraphic; no recognizable updip pinchout of sandstone reservoirs |
| Porosity: | F ave = 7.6%, range 5.8 to 9.8% |
| Permeability: | K = 0.011 mD |
| Natural fractures: | |
| Diagenetic features: | |
| Water saturation and volume/salinity of produced water: | Sw (ave) = 30%, range 18 to 40%; Salinity = 319,638 ppm, sample number=1 |
| Gas/water and oil/water contacts: | None reported but oil accumulation seems to be associated with the thickest sandstone reservoirs |
| Reservoir pressure: | |
| Bottom-hole temperature: | |
| Well spacing: | 40 to 160 acres |
| Ultimate production (EUR per well): | 95th percentile (F95) = 12 MMCF of gas, 50th percentile (F50) = 84 MMCF of gas, 5th percentile (F5) = 240 MMCF of gas, sample number = 65 |
| References: | Kell (1980); Sanders (1991); Seibert (1987); Wilson (1988) |
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