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 U
Northeast Salem gas field (NES)
| Location: | Mahoning County, Ohio (Beaver, Boardman, Canfield, Ellsworth, and Green Twps.) |
| Discovery date: | ~1975 |
| Depth (ft): | ~5,700 |
| Hydrocarbon type and GOR: | Gas and local associated oil |
| Structural setting: | Regional southeast-dipping homocline; minor terraces and anticlinal noses; major southeast-plunging anticlinal nose defined on 5th order trend surface map |
| Stratigraphic name of reservoir: | "Clinton" sands; reservoirs consist of east-west trending sandstone bodies of distributary channel origin; the best gas production occurs in the thickest and cleanest reservoirs within the structural terrace |
| Trap: | Stratigraphic with subtle structural terrace; no recognizable updip pinchout of sandstone reservoirs |
| Porosity: | F ave > 8%; F lower "Clinton" ave (core) = 4%, range 3.3 to 6%; F medina ave (core) = 4%, range 2.9 to 5.4% |
| Permeability: | K = 0.09 mD |
| Natural fractures: | An increase in fracture density probably is associated with folds within the structural terrace; northwest-southeast oriented producing trends in Mahoning County may be controlled by fracture systems with similar orientations |
| Diagenetic features: | |
| Water saturation and volume/salinity of produced water: | Sw = 15.8 to 22.2%; 44% of the wells do not produce salt water, 80% of the wells produce < 100 BW/year (< ½ BW/day), 75% of the salt water (brine) is produced in the first two years (some of this is frac water flowing back into the well bore; ´ = 9 BW/MMCFG |
| Gas/water and oil/water contacts: | None recognized; local oil production appears to lie updip or lateral to gas production |
| Reservoir pressure: | |
| Bottom-hole temperature: | 118 to 120° F |
| Well spacing: | 58 to 72 acres |
| Ultimate production (EUR per well): | 95th percentile (F95) = 20 MMCF of gas, 50th percentile (F50) = 166 MMCF of gas, 5th percentile (F5) = 489 MMCF of gas, sample number =129 |
| References: | Alexander and others (1985); Boswell and others (1993); Kell (1980); Seibert (1987) |
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