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 V
Ravenna gas field (R)
| Location: | Portage County, Ohio (Randolph, Ravenna, and Rootstown Twps.) |
| Discovery date: | 1949 |
| Depth (ft): | ~4,500 |
| Hydrocarbon type and GOR: | Gas and local associated oil |
| Structural setting: | Regional southeast-dipping homocline; no terraces or anticlinal noses reported; northwest-trending Suffield fault in Randolph and Suffield Twps. adjoins the southwest side of the field; large east-plunging anticlinal nose is located at the north end of the field |
| Stratigraphic name of reservoir: | "Clinton" sands |
| Trap: | Stratigraphic; no recognizable updip pinchout of sandstone reservoirs; no recognizable updip decrease in net sandstone thickness |
| Porosity: | F ave = 9%, sample number = 7; F ave = 7.5%, range 6 to 9.7%; F ave = <10% also reported; North Ravenna, F ave = 8.2%, range 5.8 to 11.0% |
| Permeability: | K > 0.3 mD |
| Natural fractures: | |
| Diagenetic features: | |
| Water saturation and volume/salinity of produced water: | Sw(ave) = 30%; Sw(ave) = 25%, range 13 to 32% also reported; Sw + So = 50% |
| Gas/water and oil/water contacts: | None recognized; oil seems to have accumulated in the thickest sandstone reservoirs |
| Reservoir pressure: | 1,400 psi (0.31 psi/ft); Pave = 1,564 psi, range 1548 to 1578 psi, sample number = 3; (0.36 psi/ft) |
| Bottom-hole temperature: | 102° F |
| Well spacing: | 100 acres or more |
| Ultimate production (EUR per well): | Ravenna: 95th percentile (F95)
= 40 MMCF of gas, 50th percentile (F50) = 300 MMCF of gas, 5th
percentile (F5) = 1,100 MMCF of gas, sample number = 33 North Ravenna: 95th percentile (F95) = 32 MMCF of gas, 50th percentile (F50) = 132 MMCF of gas, 5th percentile (F5) = 475 MMCF of gas, sample number = 48 Ravenna and North Ravenna: 95th percentile (F95) = 34 MMCF of gas, 50th percentile (F50) = 200 MMCF of gas, 5th percentile (F5) = 980 MMCF of gas, sample number = 81 |
| References: | Boswell and others (1993); Gurley (1963); Janssens (1977); Lytton (1970); McCormac and others (1996); Seibert (1987); Wilson (1988) |
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