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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 />SP logs are limited to water-filled or mud-filled open holes. <br />NORMAL RESISTIIVITY LOGS: <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 />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 />uranium and thorium decay series. Clay and shale bearing <br />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 />thorium by ion absorption and exchange. <br />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 />regional geothermal gradient. <br />Cable <br />Head <br />64 In. <br />Gamma <br />Ray <br />Current & <br />Single Pt. <br />Electrode <br />16 In. <br />and SP <br />Temp <br />Probe <br />ELECTRIC LOG SPECIFICATIONS: <br />Diameter 1.73 Inches <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