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 C
Best gas field (B)
| Location: | Portage (Deerfield Twp.) and Mahoning (Smith Twp.) Counties, Ohio |
| Discovery date: | 1960 |
| Depth (ft): | ~5,100 |
| Hydrocarbon type and GOR: | Gas and associated oil |
| Structural setting: | Regional southeast-dipping homocline; no terraces or anticlinal noses reported |
| Stratigraphic name of reservoir: | "Clinton" sands |
| Trap: | Stratigraphic; no recognizable updip pinchout of sandstone reservoirs, however, the net thickness of the reservoir interval decreases updip from 65 to 40 ft |
| Porosity: | F ave = 7.5%, range 6 to 9.7%; F ave = 6.3%, max 8.9% also reported |
| Permeability: | Kave <0.1 mD; Kave (log derived) = 0.029 mD, range 0.003 to 0.086 mD also reported |
| Natural fractures: | Noted in core with N78° E, S8° E, and S54° E orientations; fractures also detected using acoustic scanning logging tool, N55° E to N70° E orientations |
| Diagenetic features: | Clay = 11.8% of reservoir; complex diagenetic history with several stages of cementation, dissolution, and quartz overgrowths |
| Water saturation and volume/salinity of produced water: | Sw (ave) = 25.9%, range 15.8 to 41.1%; salinityave = 287,611 ppm, range 261,273 to 308384, sample number = 3 |
| Gas/water and oil/water contacts: | None reported but oil occupies a structurally lower position than the gas |
| Reservoir pressure: | 1,400 psi (0.27 psi/ft); 1628 psi (0.33 psi/ft) also reported |
| Bottom-hole temperature: | 102° F |
| Well spacing: | 40 to 50 acres |
| Ultimate production (EUR per well): | |
| References: | McCormac and others (1996); Sanders (1991); Seibert (1987); Wilson (1988) |
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