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 N
Lakeshore gas field (LS)
| Location: | Chautauqua County, New York |
| Discovery date: | First Medina Group well was completed in 1887 but the field was not developed until 1903 or 1904 |
| Depth (ft): | D(ave) = 3,000; range 2,000 to 4,200 |
| Hydrocarbon type and GOR: | Nonassociated gas |
| Structural setting: | Regional south-southeast-dipping homocline with numerous southeast-plunging anticlinal noses and irregular structure contours |
| Stratigraphic name of reservoir: | Medina Group (Grimsby Formation and Whirlpool Sandstone) |
| Trap: | Stratigraphic; no updip pinchout of sandstone reservoirs |
| Porosity: | F ave =
6.3%, range 1.5 to 11.2%; F ave (core) = 4.9%, range
4 to 6.5% Whirlpool Sandstone: F ave (core) = 4.7%, range 1.9 to 5.9% |
| Permeability: | K = 3.4 mD Whirlpool Sandstone: K = 0.1 mD, range <0.1 to 0.2 mD |
| Natural fractures: | |
| Diagenetic features: | |
| Water saturation and volume/salinity of produced water: | Sw(ave) = 40%; early wells reported no producing water; Salinity(ave) = 256,274 ppm, range 215,377 to 298,780 ppm, sample number = 29 |
| Gas/water and oil/water contacts: | |
| Reservoir pressure: | |
| Bottom-hole temperature: | T(ave) = 98°F, range 92 to 102°F, sample number = 10 |
| Well spacing: | |
| Ultimate production (EUR per well): | 95th percentile (F95) = 45 MMCF of gas, 50th percentile (F50) = 120 MMCF of gas, 5th percentile (F5) = 460 MMCF of gas, sample number = 100 |
| References: | Beinkafner (1983); Copley (1980); Keighin and Hettinger (1997); McCormac and others (1996); Pees (1986); Shyer (1989) |
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