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The AAPG/Datapages Combined Publications Database

Ohio Geological Society

Abstract

OGS-AAPG

Ohio Geological Society:Canton Symposium IV: Fourth Annual Technical Symposium, October 9, 1996

Pages 156 - 166

IMPROVED Previous HitRESERVOIRNext Hit CHARACTERIZATION OF THE ROSE RUN Previous HitSANDSTONENext Hit IN THE EAST RANDOLPH FIELD, PORTAGE COUNTY, OHIO

John B. Thomas, Belden & Blake Corporation, North Canton, OH
Eugene Safley, BDM-Oklahoma, Bartlesville, OK

ABSTRACT

The East Randolph Rose Run field is located in Randolph Township, Portage County, Ohio. The field was discovered in 1992 as a down dip extension of the Randolph Gas field discovered by Belden & Blake Corporation a year earlier. Since its discovery, over 40 wells have been drilled in the East Randolph field that have produced an estimated 600,000 barrels of oil and 1.5 billion cubic feet of gas.

Characterization of the productive upper Rose Run Previous HitsandstoneNext Hit members is underway to determine the technical and economic feasibility of water flooding, gas pressure maintenance, or the possibility of infill drilling for oil in the East Randolph field. Core data and log data for each Previous HitsandstoneNext Hit member was analyzed and mapped to determine their relationship with estimated ultimate recovery of oil and gas.

The upper Rose Run Previous HitsandstoneNext Hit can be divided into four distinct Previous HitsandstoneNext Hit units characterized by bedding, mineralogy and log character. Each of the four Previous HitsandstoneNext Hit units usually represents a fining-upward cycle of Previous HitsandstoneNext Hit, sandy dolomite and dolomite. The uppermost unit (#1) consists of tightly cemented Previous HitsandstoneNext Hit with quartz overgrowths, low permeability and low Previous HitporosityNext Hit, while the lowermost Previous HitsandstoneNext Hit unit (#3B) is usually the most permeable (1.5 - 12.9 md) and porous (2.6 - 11.2 percent). This variation in Previous HitporosityNext Hit and permeability is predominantly controlled by grain size, amount and type of intergranular cement, and extent of secondary dissolution Previous HitporosityNext Hit. Most of the East Randolph field's oil production can be attributed to the Previous HitreservoirNext Hit development of the Rose Run #3A and #3B units. Gas production appears to be present in all four units, but seems to be best when good Previous HitreservoirNext Hit development is found in the #1 and #2 Previous HitsandstoneNext Hit intervals. Volumetric calculations using new geologic models increase estimates of the amount of original oil-in-place at over 10 million stock tank barrels, more than double the initial estimates. The new geologic model will be used as input for Previous HitreservoirTop simulation to optimize future locations of infill wells, and determine waterflood and/or pressure maintenance feasibility.

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