Five-point deconvolution interpretation method for quantification of uranium ores by gamma spectrum logging

A five-point deconvolution interpretation method for quantification of uranium ores by γ spectrum logging, the method comprising:

• performing, by a γ detector, γ spectrum logging along a borehole formed in strata, to obtain a γ energy spectrum of each of measurement points;
• dividing the γ energy spectrum into 7 energy zones, and obtaining 7 energy zones logging curves according to count rates of each of the 7 energy zones;
• performing “first subdividing, then stripping” or “first stripping, then subdividing” on the 7 energy zones logging curves, to thereby obtain contents of uranium, thorium and potassium in each of unit layers of the strata for improving accuracy of quantitative interpretation of the uranium ores;
• and
• exploring uranium resources in the strata based on the contents of uranium, thorium and potassium;
• wherein an energy resolution of the γ detector is equal to or greater than 3.5% @662 keV, and a total count rate of an energy spectrum measured by the γ detector at a center point of a saturated uranium layer with a uranium content of 100 ppm of the strata is not lower than 1000 cps;
• wherein the 7 energy zones consist of:
• a 0th energy zone, wherein the 0th energy zone has an energy range of [0.0 MeV, 2.8 MeV], the 0th energy zone is not involved in uranium ore quantification, and the 0th energy zone is only used to evaluate whether the total count rate of the energy spectrum measured by the γ detector meets a defined standard;
• a 1st energy zone, wherein the 1st energy zone has an energy range of [0.4 MeV, 2.8 MeV], the 1st energy zone covers a largest characteristic peak of thorium at 2.615 MeV, and the 1st energy zone is recorded as a thorium characteristic spectrum 2;
• a 2nd energy zone, wherein the 2nd energy zone has an energy range of [0.4 MeV, 2.3 MeV], the 2nd energy zone covers a characteristic peak of uranium at 2.20 MeV, and the 2nd energy zone is recorded as a uranium characteristic spectrum 3;
• a 3rd energy zone, wherein the 3rd energy zone has an energy range of [0.4 MeV, 2.0 MeV], the 3rd energy zone covers a largest characteristic peak of uranium at 1.765 MeV, and the 3rd energy zone is recorded as a uranium characteristic spectrum 2;
• a 4th energy zone, wherein the 4th energy zone has an energy range of [0.4 MeV, 1.7 MeV], the 4th energy zone covers a thorium characteristic peak of 2.615 MeV and a double escape peak of 1.595 MeV, and the 4th energy zone is recorded as a thorium characteristic spectrum 1;
• a 5th energy zone, wherein the 5th energy zone has an energy range of [0.4 MeV, 1.55 MeV], the 5th energy zone covers a sole characteristic peak of potassium 1.461 MeV, and the 5th energy zone is recorded as a potassium characteristic spectrum;
• and
• a 6th energy zone, wherein the 6th energy zone has an energy range of [0.4 MeV, 1.35 MeV] the 6th energy zone covers characteristic peaks of uranium/thorium, and the 6th energy zone is recorded as a uranium characteristic spectrum 1;
• and
• wherein the 7 energy zones logging curves are recorded as {Ni(Zj)}, where i=0, 1, . . . , 6;
• j=1, 2, . . . , i represents a number of one of the 7 energy zones;
• j represents a number of one of the measurement points, and is also a number of one of the unit layers;
• Zj represents a coordinate of a j-th measurement point;
• and Ni(Zj) represents a count rate of an energy spectrum obtained at a j-th measurement point in an i-th energy zone of the 7 energy zones.