...Alan C. Donaldson; Dale Skoff Abstract: The Huntersville Chert (Onesquethawan Stage) of the central Appalachians was deposited in a detrital sediment-starved basin where a restricted sea hosted mainly silicisponges of probable Demospongid fauna. The Huntersville Chert grades into the Onondaga...

...Jesse A. Shell Abstract In southwestern Virginia, west of New River and east of East Stone Gap, the Lower Devonian Rocky Gap Sandstone and Huntersville Formation have the best potential as hydrocarbon reservoirs. Both units have a large areal extent and a combined thickness locally exceeding 150 ft...

... described it contains two separable lithologic members, an upper shale and a lower chert. In southeastern West Virginia the group is represented mainly by the Huntersville chert, which crops out in a belt about 120 miles long in Pocahontas, Greenbrier, Monroe, and Mercer counties. In Pocahontas...

.... The localities were chosen carefully relative to the stratigraphic and paleogeographic interpretation of Dennison (1961). Rock-stratigraphic units sampled include the Tioga Metabentonite, Huntersville Chert (including Bobs Ridge Sandstone Member), Onondaga Limestone, and Needmore Shale (with three subfacies...

... by a combination of closure and sealing faults. Space problems within collapsing synclines above competent reservoir rocks, the Huntersville-Helderberg lithostructural unit, are resolved by distortion and evacuation of overlying, incompetent Hamilton rocks. Huntersville-Helderberg rocks deformed into a variety...

... Accident field. Natural gas production from the 3 Maryland fields increased 17%. All production is from the Devonian Huntersville-Oriskany interval. A consultant was hired by the state to consider comments from 20 interested parties while compiling a comprehensive set of oil and gas regulations which...

... confidential by the operator. Natural gas production in Maryland increased 121.8% as 2 shut-in wells went on-line, bringing the number of producing wells in Maryland to 8. All gas is being produced from the Middle Devonian Huntersville Chert and Lower Devonian Oriskany Sandstone. Activity in Ohio continued...

... Silurian and Helderberg Group, sandstones grade northwestward to limestones. Limestones in the Hancock Formation change westward to dolomite. The Onesquethaw Stage is represented by sandstone, chert, and limestone assigned to the Wildcat Valley and Huntersville Formations. In the Middle Silurian (Keefer...

... VIRGINIA. Outstanding are the continued successful development of natural gas in Wyoming and Nicholas counties from the shallow sands down to and including the Berea sand, and the completion of a Huntersville chert gas well in Preston County. A second well producing gas in the Huntersville chert...

...Fig. 1. —MAP SHOWING WELLS WITH META-BENTONITE AT TOP OF HUNTERSVILLE CHERT ...

... of neither field has been fully defined. Gas is produced from the Huntersville chert and the underlying Oriskany sand, which are encountered at depths ranging from 4,900 to 8,250 feet. Yields vary from 1 2 million to 4 million cubic feet daily per well. Small flows of gas also have been obtained...

... that are not in proximity to the pinch-out. This unproductive trend coincides with an area of gentle structural deformation and the occurrence of Huntersville Chert directly above the Oriskany. Recent work by Jones (1982) in northeastern Tennessee and southwestern Virginia has adequately subdivided the Wildcat Valley...

... the Huntersville chert above the Oriskany sand, and the other from both the Huntersville and the Oriskany. The combined open flow of these two wells was 3,226 thousand cubic feet daily. Previously four other wells producing from the Huntersville chert with a combined open flow of 11,600 thousand cubic feet were...