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 Q
Logan oil field (Lo)
| Location: | Hocking County, Ohio (Green and Falls Twps.) |
| Discovery date: | 1939 |
| Depth (ft): | 2,700 to 2,800 |
| Hydrocarbon type and GOR: | Oil and associated gas; GOR = 800, based on 3 wells |
| Structural setting: | Regional southeast dipping homocline; minor anticlinal noses |
| Stratigraphic name of reservoir: | "Clinton" sands; best producing wells in sandstone reservoirs of deltaic and offshore-bar origin |
| Trap: | Stratigraphic |
| Porosity: | F ave(core) = 13.9%, range 11 to 19.6% |
| Permeability: | Kave(core) = 67.9 mD, range 4.5 to 349.3 mD |
| Natural fractures: | |
| Diagenetic features: | Quartz grains are locally clay coated and cemented with silica and carbonate (dolomite and ankerite) |
| Water saturation and volume/salinity of produced water: | Sw (ave, core, producing interval) = 27.3%, range 8.3 to 62.7%; water and oil are produced in nearly equal amounts—one well produced 60 BW per day; 1,200 BW/MMCFG, based on 3 wells; Salinityave = 240,760 ppm, range 165,063 to 288,701 ppm, sample number = 3; salinity = 160,000 to 185,000 ppm also reported |
| Gas/water and oil/water contacts: | |
| Reservoir pressure: | Original pressure (estimated) ~ 1,250 psi (~0.44 psi/ft); 600 psi in August 1962; 960 psi (0.36 psi/ft) also reported |
| Bottom-hole temperature: | 80°F |
| Well spacing: | 20 to 40 acres |
| Ultimate production (EUR per well): | Three wells produced 24,251 BO, 20 MMCF of gas, and 24,251 BW from Dec. 1960 to Jan. 1963; EUR (one well) = 13,200 BO; Ultimate oil in place ~48.5 MMBO/8000 acres, 5 to 25% is recoverable |
| References: | Boley and others (1965); Greene (1977); Johnson and Boley (1963); Sanders (1991); The Staff, Morgantown (W. Va.) Petroleum Research Laboratory (1962) |
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