Correlation of carbonate rock units in northwest Ohio by natural gamma logging

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... Studies by the Ohio Department of Natural Resources (1970), Norris and Fidler (1969, 1971a, 1971b, and Norris (1974) discuss the regional hydrogeology of northwestern Ohio. A report by Glaze (1972) provides information on the hydrogeology of northern Wood County, and a subsequent study by Paulson (1981) reviews the ground-water resources of Wood County. ...
The purpose of the report is to describe the hydrogeology and the chemical quality of ground water and surface water near the landfill. The evaluation was made by (1) review of available hydrogeologic and chemical-quality data; (2) mapping of the glacial overburden and underlying dolomite aquifer from well logs and geologic borings; (3) measurement of hydraulic head in the glacial overburden and dolomite aquifer; (4) collection and analysis of water-quality data from the landfill, glacial overburden, and dolomite aquifer; and (5) collection and analysis of water- and sediment-quality data from local streams. The project area is located in Wood County in northwestern Ohio and encompasses an area of approximately 10 (square miles). The area includes parts of the City of Northwood (population 6,000) and the Village of Walbridge (population 3,000).
The demand for ground water has continued to increase during the period 1967–1970. An estimated 500,000 wells of all types are being drilled each year, further, as available surface water resources become increasingly more fully used, ground water represents an increasingly greater percentage of the total water resource being used. As a result of the increasing demand for ground water, investigational programs have increased rapidly, and, in spite of a general tightening of funding during this period, there has been a general increase in both applied and basic research. Publications by Nace [1967, 1969], G. H. Davis and Meyer [1967a, 1967b], Langbein [1968], McGuinness [1968], and D. F. Peterson [1968] have reflected the increased value of ground water in the over-all water resources system.
Gamma logs, by revealing differences in the radiation intensity of unconsolidated sediments, can provide important information on the depth and sequence of beds penetrated by a cased well. In some instances the log of a well drilled into a sand and gravel aquifer can indicate the interval, or intervals, most favorable for screening. Changes in logs made before and after a well is screened and developed can show zones in the screened interval where most development occurred, and provide valuable clues as to the overall effectiveness of development. Although little used at present, gamma logging holds promise of becoming an important tool in hydrologic studies and in the well construction industry. More testing and possibly standardization of equipment is currently needed, along with experimentation in logging techniques, to improve the method. Field correlation between logs and drilling samples are necessary to improve the accuracy of log interpretation.
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