Double-detector X-ray fluorescence logging probe tube and method

Abstract

The invention discloses a double-detector X-ray fluorescence logging probe tube and a method. The double-detector X-ray fluorescence logging probe tube mainly comprises a probing window and a probe-motivating system. The probing window comprises a light pipe collimator, a D1 collimator, a D2 collimator, a berylium window, a light pipe S, a detector D1 and a detector D2. The probe-motivating system is formed by the light pipe S, the detector D1 and the detector D2; the light pipe S is connected with a work power supply; the detector D1 and the detector D2 are sequentially connected with an amplifier, a digitalized multichannel impulse amplitude analyzer, a two-channel data acquisition and controller, an interface circuit, and a ground work station independently. The method helps to solve the problem of well fluid correction when an X-ray tube is utilized to stimulate X-ray fluorescence logging, and thus the radiation security of the X-ray fluorescence logging probe tube is improved.

Description

technical field [0001] The invention belongs to the technical field of geological exploration, and relates to a dual-detector X-ray fluorescence logging probe and a method. Background technique [0002] In X-ray fluorescence logging, the well fluid absorbs and scatters the initial rays of the excitation source and the characteristic X-rays produced by the target elements in the borehole wall, and has different absorption coefficients for different energies of rays. The absorption of initial rays and characteristic X-rays by the well fluid reduces the count rate of the characteristic X-ray fluorescence of the target element; while the scattering of high-energy rays (greater than the energy of the characteristic X-rays of the target element) increases the scattering of the measured spectral lines background, thereby increasing the characteristic X-ray full peak count rate in the instrument spectrum. Therefore, in the logging process, the existence of well fluid changes the li...

AI Technical Summary

Problems solved by technology

Different from the isotope excitation source, the spectral line output by the X-ray light tube is a continuous spectrum, and the characteristic backscattering peak is not obvious in the spectrum of the X-ray fluorescence logging instrument. The X-ray fluorescence logging of the excitation source cannot be used, and it is necessary to study a new method of well fluid correction for the X-ray fluorescence logging excited by the X-ray light tube

Images