HEATING-TYPE GROUND WATER RESISTIVITY LOGGING METHOD, DETECTOR FOR HEATING-TYPE GROUND WATER RESISTIVITY LOGGING, AND MEASURING INSTRUMENT FOR HEATING-TYPE GROUND WATER RESISTIVITY LOGGING
PROBLEM TO BE SOLVED: To provide a ground water resistivity logging method allowing even an unskilled person to calculate the existence of a water channel of ground water and its depth from the ground surface through short-time measurement by a simple technique, having satisfactory measuring accuracy, and less giving load to the peripheral environment, and a detector and a measuring instrument used for the logging method. SOLUTION: This detector 2 is sent down into a bore hole at a prescribed speed. The temperature of a heating unit 21 and water temperature around the detector 2, which are sensed by first and second temperature sensors 22 and 23, are measured simultaneously at prescribed periods. Changing temperature is calculated for each of measurement depths from the temperature of the heating unit and the water temperature measured simultaneously with the temperature of the heating element, by utilizing a fact that the temperature of the heating unit consists of an element of equilibrium temperature linearly related to the water temperature and an element of changing temperature affected by a water flow from the water channel of ground water, and that the equilibrium temperature is linearly related to the water temperature. A measuring depth at which the changing temperature abruptly changes is found out, thereby finding a depth at which the water channel of ground water exists. COPYRIGHT: (C)2009,JPO&INPIT
