Study On Compact Composite Logging System

With the rapid development of national nuclear power technology,more and more uranium exploration in the southern mountain area is undergoing.The vehicle-mounted logging systems cannot be used in the complex topography of the southern mountain area.Hand-winch logging systems can't work continuously,and can't record and display the results of measurement automatically.Existing logging probe can only measure single parameter.The total-gamma-probe can't accurately measure the concentration of uranium in the mixed ore of thorium and uranium or in seambed which is rich of radioactive mineral material.In order to improve the logging efficiency,to meet the growing demand of logging work in southern mountain area,this thesis has developed a light composite logging system HD-4002C with independent intellectual property rights,based on a project of "11th five-year plan" and one of "12th five-year plan" of Pre-research Project of the General Armaments Department,two of the Nuclear Industry Geological Bureau,titled Uranium and Thorium Gamma Spectrometry logging technology research and multi-parameter combination probe development project,respectively.The logging system HD-4002C includs a portable multiple-parameter-measuring logging probe ZH401 capble of measuring six parameters in one run,a portable slime borehole y spectrometry logging probe N451 capble of measuring uranium content continuously in deposits of thorium-uranium mixed ore,or of high uranium content or with dramatic changes of uranium content,a light winch system with single-core armoured cable transmitting signal in EFSK and supplying power for the probe underground,the HD-4002C console compatible with a variety of logging probes and logging acquisition software.The results of laboratory calibration and field experiments are of high repeatability and stability and show that the logging system is small in size,light in weight and intelligent,and suitable for detection uranium in various complex geographic environment and works reliably.The logging system is,for the first time in domestic,capble of logging automatically and digitally under the condition of complex topography,detecting gamma spectrometry continuously in uranium-thorium mixed deposits,with measuring accuracy of uranium and thorium within±10%,detecting six parameters in one run,namely,Natural Gamma(with accuracy±5%),Natural Potential(with accuracy±5%),Apparent Resistivity(with accuracy±10%),Single Point Resistance(with accuracy±10%),Drilling Azimuth(with accuracy±2°)and Drilling Zenithal Angle(with accuracy±0.2°),and displaying the real-time measurement values and curves thereof on the computer.It fills the blanks of light composite logging system in domestic.It is digital,intelligent and of series,and can be used to detecte uranium content in various complex geographic environment with high efficiency and high precision.