Interpretation of the Fresh Water/Brine Interface of the Devonian/Silurian Carbonates of Central Ohio
Creators:Compton II, Steven C.
Advisor:Bair, E. Scott
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Publisher:The Ohio State University
Series/Report no.:The Ohio State University. Department of Geological Sciences Senior Theses; 1995
This thesis was conducted to determine the relation between the brine horizon and the beds of the Devonian/Silurian carbonate units known by the drillers' name, Big Lime. The relation can take three forms: A) the brine horizon dips parallel to its parent bed, B) the brine horizon dips at a steeper angle than its parent bed, or C) the brine horizon dips at a shallower angle than its parent bed. It is important to know this relation so that an approximate depth to brine can be determined during the drilling of oil and gas wells, which contain brine as a by-product, in addition to determining the depth at which brine can be found for the injection of waste brine. Data as to the depth to the "First Brine" of the Big Lime and the top of the Big Lime was determined using oil and gas "header cards" archived in the Geologic Records Section of the Ohio Department of Natural Resources Division of Geological Survey. The data were imported into SURFER for Windows and contour maps were made of the top of the Big Lime and the elevation of the First Brine Horizon. These maps were compared and the relation between the brine horizon and the top of the Big Lime was determined. This relation agrees with Scenario B above. Utilization of these findings makes it possible to determine the relative placement of the Big Lime's brine horizon compared to its upper surface. This information will aid drillers and environmental scientists in the determination of where brine will be encountered and where brine can be found for the disposal of petroleum-industry brines by injection.
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