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Nondestructive testing analytical method for kerogen based on terahertz time-domain spectroscopy

A terahertz time-domain, non-destructive testing technology, applied in the measurement of color/spectral properties, material analysis by optical means, analyzing materials, etc. Detection and test results are accurate and repeatable

Inactive Publication Date: 2012-02-15
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, infrared spectroscopy is mainly based on the molecular vibration generated by the interaction between electromagnetic radiation and matter to obtain the structural information of the vibration and rotation of the kerogen functional group, but for weak interactions between molecules (such as hydrogen bonds) in the near and middle Infrared band is difficult to reflect
Chromatography-mass spectrometry is to pyrolyze kerogen first, and then measure its isolates. During the pyrolysis process, the composition of kerogen will inevitably be damaged, and the sample cannot be directly recycled, which is a destructive test.

Method used

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  • Nondestructive testing analytical method for kerogen based on terahertz time-domain spectroscopy
  • Nondestructive testing analytical method for kerogen based on terahertz time-domain spectroscopy
  • Nondestructive testing analytical method for kerogen based on terahertz time-domain spectroscopy

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Embodiment 1

[0049] This embodiment provides a kerogen non-destructive detection and analysis method based on terahertz time-domain spectroscopy, wherein:

[0050] Preparation of kerogen standard samples and detection process are carried out according to the above-mentioned steps;

[0051] In order to fully understand the process and results of organic matter evolution in source rocks, the samples used in the simulation experiments are required to have relatively low maturity. The source rocks used in this example are low-mature gray mudstone in the Biyang sag (the well depth is 1523m, and the geological age is Eh3);

[0052] The pyrolysis process was carried out in a closed system, the initial pyrolysis temperature was 300°C, the final pyrolysis temperature was 500°C, and it was divided into 10 pyrolysis stages. The specific pyrolysis temperatures are shown in Table 1;

[0053] The obtained kerogens of different maturity are named according to the temperature of the pyrolysis section, an...

Embodiment 2

[0070] This embodiment provides a kerogen non-destructive detection and analysis method based on terahertz time-domain spectroscopy, wherein:

[0071] Preparation of kerogen standard samples and detection process are carried out according to the above-mentioned steps;

[0072] The source rock used in this example is gray mudstone;

[0073] The pyrolysis process is carried out in a closed system, the initial pyrolysis temperature is 275°C, the final pyrolysis temperature is 500°C, and it is divided into 9 pyrolysis stages. The specific pyrolysis temperature is shown in Table 2;

[0074]The obtained kerogens of different maturity are named according to the temperature of the pyrolysis section. After analysis, the obtained kerogen parent material type is II 1 type.

[0075] Image 6 are the terahertz time-domain waveforms of 10 kerogen standard samples. By the same analysis process as in Example 1, the absorption spectrum ( Figure 7 ) and the refractive index spectra of ker...

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Abstract

The invention relates to a nondestructive testing analytical method for kerogen based on terahertz time-domain spectroscopy. The method comprises the following steps of: firstly, selecting a sample cell; secondly, preparing a kerogen standard sample and accommodating the kerogen standard sample in the sample cell; thirdly, detecting the kerogen standard sample and the empty sample cell by using the terahertz time-domain spectroscopy to obtain a terahertz pulse time-domain waveform of the kerogen standard sample and a terahertz pulse time-domain waveform of the empty sample cell; fourthly, carrying out data processing on the terahertz pulse time-domain waveform of the kerogen standard sample and the terahertz pulse time-domain waveform of the empty sample cell to construct a standard fingerprint spectrum library; and fifthly, analyzing the thermal evolution and hydrocarbon generating capabilities of the kerogen standard sample according to optical parameters of the standard fingerprint spectrum library. The nondestructive testing analytical method for the kerogen based on the terahertz time-domain spectroscopy which is disclosed by the invention has the advantages of quick and nondestructive detection for the kerogen, easiness in operation, simpleness in data processing, favorable repeatability and relatively accurate measuring result.

Description

technical field [0001] The invention relates to a kerogen terahertz time-domain spectrum detection method, which is an optical parameter method for accurately measuring rock organic matter-kerogen by using a terahertz time-domain spectrum, and belongs to the technical field of rock organic matter analysis and detection. Background technique [0002] Kerogen is the main form of organic matter in geological bodies, accounting for about 95% of the deposited organic matter in the crust, and is the main source of parent material for oil and gas. According to the thermal evolution theory of kerogen, under the action of temperature and pressure, part of the hydrogen bonds and fatty chains of kerogen fall off from the kerogen matrix and become the source of oil and gas. It is related to the ability to generate, and has attracted much attention. [0003] Many petroleum geologists have used a large number of infrared spectroscopy, pyrolysis experiments combined with color-mass spectr...

Claims

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Application Information

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IPC IPC(8): G01N21/35G01N1/28G01N21/3563G01N21/3586
Inventor 赵昆宝日玛郑伦举田璐
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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