Natural gamma ray spectrum logging tool and its working method
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A natural gamma ray spectrum and logging tool technology, applied in the field of radioactive measurement equipment, can solve the problem of insufficient information utilization, and achieve the effects of light weight, high precision and high sensitivity
Active Publication Date: 2017-10-03
上海新漫传感科技有限公司
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Problems solved by technology
Natural gamma ray logging can only reflect the total effect of all radionuclides in the formation, and the information provided by the formation has not been fully utilized
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Embodiment 1
[0077] In this embodiment, the detection element 13 is a BGO crystal, Φ25×40mm, the photomultiplier tube 15 is Hamamatsu R6094 photomultiplier tube, and the spectrum-stabilizing substance 121 is analytically pure potassium carbonate, with a mass of 20g, pressed into Φ25×25mm, placed in housing 120. When the spectrum is stable, the energy spectrum acquisition time t c for 300s, E c is 1.46MeV (40 The characteristic peak of K), looking for the peak position C of potassium p , to perform energy calibration on the spectrometer.
[0078] Compared with sodium iodide crystals commonly used in energy spectrometers, bismuth germanate crystals (BGO) have a large atomic number (effective atomic number 74) and a high density (7.13g cm -3 ), BGO crystals of the same size have an all-energy peak efficiency of γ-rays that is more than three times that of sodium iodide crystals. BGO crystals do not deliquesce, have stable chemical properties, good mechanical strength, and do not require m...
Embodiment 2
[0081] In this embodiment, the detection element 13 is LaBr 3 (Ce) crystal, Φ25×40mm, photomultiplier tube 15 is ET9125B photomultiplier tube. When the spectrum is stable, the energy spectrum acquisition time t c 120s, E c is 2.62MeV ( 232 The characteristic peak of Th), looking for the peak position of thorium C p , to perform energy calibration on the spectrometer.
[0082] LaBr 3 (Ce) crystals have the characteristics of large atomic number, high density, good energy resolution (about 3% for 662 keV), high light output, and small temperature coefficient. Using LaBr 3 The detector made of (Ce) crystal has high sensitivity, good resolution and small temperature coefficient. Compared to sodium iodide crystals, LaBr 3 (Ce) crystals are more suitable for energy spectrum measurement, especially the application of gamma ray spectrum logging.
[0083] According to the above-mentioned design plan, a corresponding natural gamma ray spectrum logging tool is formed, which has ...
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Abstract
The invention discloses a natural gamma ray spectrum logging instrument, which includes a probe, an operating table and a winch cable; the probe and the operating table are connected and communicated through the winch cable, and it includes a detector and an electronic system; the detecting The device includes a spectrum stabilizing device, a detection element, a photoconductive element, a photomultiplier tube and a pre-amplification circuit. The electronic system in the probe includes amplifier, multi-channel analyzer, controller, memory, high-voltage power supply and low-voltage power supply, and the detection element is a kind of BGO crystal or LaBr3 (Ce) crystal; the spectrum stabilizing device includes The housing and the spectrum stabilizing material arranged in the housing, the spectrum stabilizing device is pressed into a cake shape and placed in the housing. The natural gamma ray spectrum logging tool of the present invention adopts BGO or LaBr3 (Ce) crystal detectors, has high sensitivity and good resolution, has built-in natural material automatic spectrum stabilization, is easy to use, and mainly measures natural radioactivity in downhole rocks. Total count rate, natural uranium, thorium, potassium content and distribution data.
Description
technical field [0001] The invention relates to the field of radioactive measuring equipment, in particular to a natural gamma energy spectrum logging instrument for measuring the contents of uranium, thorium and potassium in rocks and a working method thereof. Background technique [0002] Natural gamma ray logging is a logging method that measures the natural gamma ray intensity of rock formations in wells to study geological problems. Rocks generally contain varying amounts of radioactive elements and emit radiation continuously. Using these laws, it is possible to divide the geological section of the borehole, determine the shale content of the sandstone in the sandstone section and judge the permeability of the rock qualitatively according to the natural gamma ray logging results. [0003] An immediate use of gamma ray logging is to find radioactive minerals (uranium, thorium, etc.), as well as other minerals that are radioactive, such as potassium salts. [0004] Nat...
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