Formation element capture gamma-ray spectra measurement method and device

A technology for capturing gamma energy spectrum and stratigraphic elements. It is used in measurement devices, geophysical measurements, and nuclear radiation exploration. It can solve problems such as poor accuracy and achieve high accuracy.

Active Publication Date: 2015-11-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of poor accuracy existing in the existing element capture gamma spectrum measurement method, the present invention further proposes a measurement method and device for formation element capture gamma spectrum, specifically including the following technical solutions:

Method used

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  • Formation element capture gamma-ray spectra measurement method and device
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  • Formation element capture gamma-ray spectra measurement method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] combine figure 2 As shown, the measurement method of formation element capture gamma energy spectrum provided by this embodiment includes:

[0047] Step 21, build a measurement device for the formation element capture gamma energy spectrum based on the Am-Be neutron source.

[0048] combine image 3 As shown, the test device may include: a measurement body 31, a first moderator shield 32, a sample platform to be tested 33, a detector 34, a data collection and processing module 35 and a data analysis module 36; the first moderator shield 32, The sample stage 33 to be tested and the detector 34 are arranged in the measuring body 31, the first moderation shield 32 is used to moderate the fast neutrons emitted by the neutron source 37, and the sample stage 33 to be tested is arranged in the first moderation shield At the ray exit of 32, the detector 34 is used to obtain the prompt gamma energy spectrum data of the sample to be tested, and the data collection and processi...

Embodiment 2

[0067] combine Figure 6 As shown, the measurement method of formation element capture gamma energy spectrum provided by this embodiment includes:

[0068] Step 61, build a measuring device for formation element capture gamma energy spectrum based on Am-Be neutron source.

[0069] combine Figure 7 As shown, the test device may include: a measurement body 31, a second moderator shield 71, a detector 34, a data collection and processing module 35, and a data analysis module 36; the second moderator shield 71 and the detector 34 are arranged in the measurement In the main body 31, the second moderation shield 71 is used to carry the sample to be tested and the fast neutrons emitted by the moderation neutron source 37, and the detector 34 is used to obtain the prompt gamma energy spectrum data of the sample to be tested, and the data acquisition The processing module 35 is used to collect and process the prompt gamma energy spectrum data obtained by the detector 34, and the dat...

Embodiment 3

[0082] combine Figure 8 As shown, the measurement method of the formation element capture gamma energy spectrum provided by this embodiment is compared with that of Embodiment 2, the contents of steps 61 to 64 are the same, and after step 64, it also includes:

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Abstract

The invention provides a formation element capture gamma-ray spectra measurement method and device, and belongs to the technical field of oil-gas exploration logging. The method comprises the steps that a neutron source is slowed down according to the neutron capture cross section of samples to be measured; and standard capture gamma-ray spectra of the samples to be measured can be acquired through measurement when thermal neutron flux of reaction of the neutron source through slowing down and the atomic nucleus of the samples to be measured reaches the position of the preset value. The neutron source is slowed down according to the neutron capture cross section of different samples to be measured so that the element capture gamma-ray spectra of the samples to be measured can be acquired through measurement, and multiple types of formation element capture gamma-ray spectra with higher accuracy can be acquired.

Description

technical field [0001] The invention relates to a measurement method and device for gamma energy spectrum captured by formation elements, and belongs to the technical field of oil and gas exploration well logging. Background technique [0002] Nuclear logging technology is one of the cutting-edge logging technologies developed rapidly with the development of contemporary nuclear technology and the needs of petroleum, coal, geological minerals, etc. for the development of nuclear logging technology. From the natural gamma ray logging for measuring the natural radioactivity of the formation to the natural gamma ray spectrum logging for obtaining the content of uranium, thorium and potassium, and then to the geochemical logging (Geochemical Logging), until the current measurement of the thermal neutron capture spectrum of formation elements Elemental Capture Spectroscopy (ECS for short) provides an effective solution to the problems of complex reservoir lithology identification...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V5/10
CPCG01V5/101G01N23/2204G01N23/222
Inventor 武宏亮李宁兰长林冯周冯庆付王克文
Owner PETROCHINA CO LTD
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