--> Abstract: Continuous-Type (Basin-Centered) Gas Accumulation in the Lower Silurian "Clinton" Sands, Medina Group, and Tuscarora Sandstone in the Appalachian Basin, by R. T. Ryder, J. R. Sanfilipo, R. D. Hettinger, C. W. Keighin, B. E. Law, V. F. Nuccio, W. J. Perry, Jr., and C. J. Wandrey; #90950 (1996).
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Abstract: Continuous-Type (Previous HitBasinNext Hit-Previous HitCenteredNext Hit) Previous HitGasNext Hit Accumulation in the Lower Silurian "Clinton" Sands, Medina Group, and Tuscarora Sandstone in the Appalachian Basin

R. T. Ryder, J. R. Sanfilipo, R. D. Hettinger, C. W. Keighin, B. E. Law, V. F. Nuccio, W. J. Perry Jr., C. J. Wandrey

Following earlier interpretations by Davis (1984), Zagorski (1988,1991), and Law and Spencer (1993), investigations at the U.S. Geological Survey (USGS) suggest that natural Previous HitgasNext Hit trapped in the Lower Silurian "Clinton" sands, Medina Group, and Tuscarora Sandstone of the Appalachian basin constitute a regionally extensive continuous-type (Previous HitbasinNext Hit-Previous HitcenteredNext Hit) Previous HitgasNext Hit accumulation. Based on the USGS 1995 National Assessment of United States oil and Previous HitgasNext Hit Previous HitresourcesNext Hit (Gautier and others, 1995, USGS DDS-30), this accumulation contains, at a mean value, several tens of trillion cubic feet of recoverable Previous HitgasNext Hit estimated as undiscovered.

Important characteristics of continuous-type (Previous HitbasinNext Hit-Previous HitcenteredNext Hit) Previous HitgasNext Hit accumulations, such as low-permeability reservoir, abnormal formation pressure, Previous HitgasNext Hit fields that tend to coalesce with additional exploration, Previous HitgasNext Hit shows or production in most holes drilled, low water yield, lack of well-defined downdip Previous HitgasNext Hit-water contacts, production "sweet spots", and a general lack of structural control on entrapment are all present in the proposed "Clinton"/Medina/Tuscarora Previous HitgasNext Hit accumulation. A 17,000 square mile region of western New York, northwestern Pennsylvania, eastern Ohio, and a small area of westernmost West Virginia--part of which is already Previous HitgasNext Hit productive in the "Clinton" sands and Medina Group--is the most favorable corridor for future continuous-type Previous HitgasNext Hit Previous HitresourcesNext Hit. Oil and Previous HitgasNext Hit produced in e st-central Ohio from "Clinton" sands since the early 1880's, located updip from the most favorable corridor of continuous-type Previous HitgasNext Hit Previous HitresourcesNext Hit, are considered conventional-type hydrocarbon accumulations because of their tendency to exist as discrete fields with well-defined oil- and Previous HitgasTop-water contacts. The boundary between the conventional- and continuous-type accumulations is transitional and poorly defined.

AAPG Search and Discovery Article #90950©1996 AAPG GCAGS 46th Annual Meeting, San Antonio, Texas