Neutron-gamma well logging apparatus with more sensitivity for chlorine

A new neutron-gamma well logging apparatus for separating in the earth section of collection strata with poor mineralized water is described. In such a setting construction materials other than iron are used. The probing device (sonde) uses a Cf252 neutron source and NaI(Tl) spectrometric detector. In conditions of a closed oil well in the optimum mineralization range (15–40 g chloride salt/l water) the difference in registrated data against poorly minearlized water with fresh fluid is more than 10% (in porosity 20%). The apparatus has an external strong frame with diameter of 90 mm. the maximum operating temperature is 120°C. The apparatus is designed for investigation of oil, gas, hydrogeological wells and ecological purposes.