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ELECTRIC - GAMMA RAY-TEMPERATURE LOG TOOL <br /> SPONTANEOUS POTENTIAL LOGS: <br /> SP Logs record potentials or voltages developed between the <br /> borehole fluid and the surrounding formation and are <br /> representations of lithology and water quality.Recording of <br /> Cable_ SP logs are limited to water-filled or mud-filled open holes. <br /> fiea�l <br /> NORMAL RESISTIIVITYLOGS: <br /> Normal Resistivity Logs record the electrical resistivity of <br /> the borehole environment with lower resistivities indicative <br /> of clays and higher resistivities being sands and gravels. <br /> Normal resistivity logs are affected by bed thickness, <br /> Borehole diameter and borehole fluid. <br /> SINGLE POINT RESISTIVITY LOGS: <br /> Single Point Resistivity Logs record the electrical resistance <br /> from points within the borehole to an electrical ground at <br /> land surface.Single-point resistance logs are useful in the <br /> 64 In.— determination of lithology,water quality,and location of <br /> fracture zones. <br /> GAMMA RAY LOGS: <br /> Gamma Ray Logs record the amount of natural gamma <br /> radiation emitted by the rocks surrounding the borehole. <br /> The most significant naturally occurring sources of gamma <br /> radiation are potassium 40 and daughter products of the <br /> Gamma_ uranium and thorium decay series.Clay and shale bearing <br /> Ray rocks commonly emit relatively high gamma radiation <br /> because they include weathering products of potassium <br /> feldspar and mica and tend to concentrate uranium and <br /> Current& thorium by ion absorption and exchange. <br /> Single Pt.— <br /> Electrode TEMPERATURE LOGS: <br /> Temperature Logs record the water temperature in the <br /> borehole.Temperature logs are useful for delineating <br /> water-bearing zones and identifying vertical flow in the <br /> borehole between zones of differing hydraulic head <br /> penetrated by wells.Borehole flow between zones is <br /> indicated by temperature gradients that are less than the <br /> 16 In. regional geothermal gradient. <br /> and SP <br /> Temp <br /> Probe <br /> 0 <br /> ELECTRIC LOG SPECIFICATIONS: <br /> Diameter 1.731nches <br /> Length 8.37 Feet <br /> Weight 21.7 Lbs. <br /> Max. Temp 158°F <br /> Resist. Range 0-10,000 ohm-m <br /> Gamma Ray 1.97 inches long x.98 inches diameter <br /> Scintillation crystal <br />