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Method for calculating rock density based on scattering energy spectrum dual-energy windows

A dual-energy window and density technology, which is applied in the use of wave/particle radiation for material analysis, measuring devices, instruments, etc., can solve the problems of cumbersome measurement process and frequent calibration, and achieve the effect of convenient measurement process

Active Publication Date: 2016-05-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

The current measurement method requires frequent calibration, and the measurement process is cumbersome

Method used

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  • Method for calculating rock density based on scattering energy spectrum dual-energy windows
  • Method for calculating rock density based on scattering energy spectrum dual-energy windows
  • Method for calculating rock density based on scattering energy spectrum dual-energy windows

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specific Embodiment

[0057] Use Monte Carlo numerical simulation method or experimental calibration method to calculate when the density of the tested rock is unchanged, change the lithology of the tested rock, that is, the lithology index, and change the density of the tested rock sample (such as image 3 Shown). image 3 In order to use the density response formula N under the condition of the same density and changing lithology index P = F 1 (ρ), N K = F 2 (ρ) Schematic diagram of the measured value of the calculated sample density, select two densities ρ 1 , Ρ 2 For example, by image 3 It can be seen that when the density of the measured rock is constant, the measured values ​​of the high and low energy window densities are not affected by the lithology index. The density ρ calculated by the gamma count rate of the high and low energy windows K , Ρ P The densities of rock samples that deviate from the real measured rock samples are also inconsistent. The calculation results of the low energy windo...

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Abstract

The invention discloses a method for calculating the rock density based on scattering energy spectrum dual-energy windows and belongs to the technical field of physical properties of rocks. A device for measuring the rock density based on the scattering energy spectrum dual-energy windows is adopted to calculate the rock density, and firstly a scattering gamma-ray spectrum is recorded based on the principle that gamma rays and substance produce Compton scattering; the high-energy window and the low-energy window are selected, a simulation or graduation method is utilized to obtain the function relation of counting of scattering gamma rays of the high-energy window and the low-energy window and density response; the relation of the density measurement value correcting volume and the difference between density measurement values of the high-energy window and the low-energy window is further obtained to offset the interference of lithological characters to measurement results, and accordingly the density of a measured sample is accurately calculated. Compared with an existing radioactive method based substance density measuring technology, the method has the advantages of being accurate, quick and convenient to calculate, being not subjected to the influence of the lithological characters, and the like.

Description

Technical field [0001] The invention belongs to the technical field of petrophysical properties, and specifically relates to a method for calculating rock density based on a double energy window of a scattering energy spectrum. Background technique [0002] Rock density is the most basic physical parameter of rock, and it is closely related to the physical and mechanical properties of rock such as strength, corrosion resistance, deformation resistance, permeability, and porosity. [0003] The non-destructive measurement of material density using gamma rays is divided into transmission and scattering methods. The transmission method is to place the gamma source and detector on opposite sides of the sample, and measure the relationship between the transmission gamma ray count rate and the material density. In order to calculate the material density, based on the count rate and radioactive statistical error considerations, this method is suitable for the density measurement of smaller...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/24G01N23/203
CPCG01N9/24G01N23/203
Inventor 张锋吴赫张泉滢王新光刘军涛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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