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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 E

Claysville oil field (Clv)

Location: Guernsey County, Ohio (Spencer and Westland Twps.)
Discovery date: 1968
Depth (ft): 4,800 to 5,100
Hydrocarbon type and GOR: Oil and associated gas
Structural setting: Regional southeast-dipping homocline; adjoins the west side of the Cambridge arch
Stratigraphic name of reservoir: "Clinton" sands; reservoirs dominated by northeast-trending sandstone bodies of distributary channel and distributary mouth bar origin
Trap: Stratigraphic; no recognizable updip pinchout of sandstone reservoirs; the net thickness of the reservoir interval decreases slightly updip
Porosity: F ave(core) = 5%, range 0.1 to 9.2%
Permeability: Kave(core) = 3.5 mD, range <0.01 to 13.2 mD
Natural fractures: Noted in core
Diagenetic features:  
Water saturation and volume/salinity of produced water: Sw (ave) = 31.2%, range 16.5 to 43.4%; salinityave = 212,000 ppm, range 147,000 to 256,000
Gas/water and oil/water contacts:  
Reservoir pressure: 1,200 psi (0.24 psi/ft); 1,559 to 1,906 psi (0.30 to 0.39 psi/ft) also reported
Bottom-hole temperature:  
Well spacing:  
Ultimate production (EUR per well):  
References: Baranoski (1993), Keltch and others (1990); Root and Martin (1995); Sanders (1991), Thomas (1993); U.S. Bureau of Mines (1969)

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