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The AAPG/Datapages Combined Publications Database

Ohio Geological Society



Ohio Geological Society: Into the New Millennium: The Changing Face of Exploration in the Knox Play, Sixth Annual Fall Symposium, October 20, 1999

Pages 44 - 71


Rick Reeve, Consulting Geologist, 7345 Cheryl Lane NW, Massillon, OH 44646


Hydrocarbon microseepage is known to occur from sub- surface accumulations of hydrocarbons. This hydrocarbon microseepage eventually reaches the surface where the introduction of hydrocarbons into the Previous HitsoilNext Hit substrate leads to significant changes in the Previous HitsoilNext Hit chemistry over and adjacent to hydrocarbon reservoirs. These changes in the Previous HitsoilNext Hit chemistry are the basis of a host of different tools that are used to measure these Previous HitsoilNext Hit changes in the search for hydrocarbon reservoirs. One of the most effective tools is the direct measurement of the hydrocarbons present in the near surface environment. The majority of microseepage from reservoirs can be seen to be occurring in a directly vertical direction. This microseepage produces a "geochemical chimney" over commercial reservoirs. The "geochemical chimney" is a direct manifestation of the hydrocarbons seeping upwards into the soils overlying commercial reservoirs. These seeping hydrocarbons induce major chemical changes in the chimney as a direct result of hydrocarbon consumption by bacteria. These chemical changes can be seen in differences in the Eh, pH and conductivity of the soils overlying commercial reservoirs. Measurements made of the Previous HitsoilNext Hit hydrocarbons, Eh, pH and conductivity of individual Previous HitsoilNext Hit samples over an area show irrefutable proof of vertical migration. Examples of Previous HitsoilNext Hit-gas surveys over Trempealeau and Rose Run seismic prospects in Ohio will be used to substantiate this. Previous HitSoilNext Hit-gas samples taken in a grid pattern over known seismic remnants are seen to differentiate regional background values over dry holes from anomalously high hydrocarbon values over productive remnants. Numerous Previous HitsoilTop-gas surveys conducted by the author over Trempealeau and Rose Run seismic prospects in Ohio have led to an overall successful prediction rate of 80%. Dry holes have been correctly predicted at an 85% rate.

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