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 F
Clayton oil field (Cl)
| Location: | Perry County, Ohio (Clayton Twps) |
| Discovery date: | 1935; (20 exploration wells were drilled in the township between 1917 and 1935) |
| Depth (ft): | 3,300 |
| Hydrocarbon type and GOR: | Oil and associated gas |
| Structural setting: | Regional eastward-dipping homocline with very local anticlinal noses; residual structure map suggests that the field is cut by a northwest-trending fault (southwest side up) |
| Stratigraphic name of reservoir: | "Clinton" sands; reservoirs dominated by sandstone bodies of distributary and tidal channel origin |
| Trap: | Stratigraphic; local closure along a possible northwest-trending fault |
| Porosity: | F ave (core) = 14.5%, range 12 to 17% |
| Permeability: | Kave(core) = 34.8 mD, range <0.1 to 150 mD |
| Natural fractures: | Water used in a 5-spot well pattern for secondary recovery may have escaped through fractures; oriented core in nearby Hocking County indicate a well-developed natural fracture system; natural fractures may enhance production |
| Diagenetic features: | Calcite is the dominant cement; local dolomite rhombs; most quartz grains are coated with clay; quartz overgrowths common |
| Water saturation and volume/salinity of produced water: | Salinity (ave) = 316,132 ppm, range 315,487 to 316,778 ppm, sample number = 2 |
| Gas/water and oil/water contacts: | |
| Reservoir pressure: | |
| Bottom-hole temperature: | |
| Well spacing: | 20 acres per oil well; 80 acres per gas well |
| Ultimate production (EUR per well): | EUR = 17,000 BO per well, range 1,000 to 75,000 BO per well, based on production from 85 wells; best production (IP > 500 BOPD) located in local closure along the southwest-up side of a proposed northwest-trending fault |
| References: | Alkire (1952); Cottingham (1951); Osten (1982); Overbey and Henniger (1971) |
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