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Coal seam nuclear magnetic resonance T2 spectrum and pore distribution conversion method

A technology of nuclear magnetic resonance and conversion method, which is applied in the direction of analysis by nuclear magnetic resonance, material analysis through resonance, and material analysis, etc. It can solve the problems of strong volatility of mercury, environmental pollution, toxicity, etc., and achieve the effect of low analysis cost

Pending Publication Date: 2021-06-22
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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  • Claims
  • Application Information

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Problems solved by technology

Because mercury is highly volatile and toxic, it is easy to cause environmental pollution

Method used

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  • Coal seam nuclear magnetic resonance T2 spectrum and pore distribution conversion method
  • Coal seam nuclear magnetic resonance T2 spectrum and pore distribution conversion method
  • Coal seam nuclear magnetic resonance T2 spectrum and pore distribution conversion method

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Embodiment Construction

[0039] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention are clearly and completely described below. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without making creative efforts belong to the protection scope of the present invention.

[0040] The invention discloses a method for converting coal seam nuclear magnetic resonance T2 spectrum and pore distribution, comprising the following steps:

[0041] a Carry out nuclear magnetic resonance measurement on the saturated water-coal crushed sample, and obtain the nuclear magnetic resonance T2 spectrum;

[0042] b. Perform low-temperature nitrogen adsorption experiment measurement on the saturated water-coal crushed sample in step a to obtain a pore distribution...

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Abstract

The invention relates to a coal seam nuclear magnetic resonance T2 spectrum and pore distribution conversion method which is characterized by comprising the following steps: a, performing nuclear magnetic resonance measurement on a saturated water coal crushed sample to obtain a nuclear magnetic resonance T2 spectrum; b, performing low-temperature nitrogen adsorption experimental measurement on the saturated crushed water coal sample to obtain a pore distribution curve; c, comparing the nuclear magnetic resonance T2 spectrum with the pore distribution curve, picking up the transverse relaxation time T2 and the pore diameter R value of the corresponding extreme point, and obtaining a conversion relational expression of the transverse relaxation time T2 and the pore diameter R value; d, converting a nuclear magnetic resonance porosity component in the nuclear magnetic resonance T2 spectrum into a pore volume of a unit mass sample; and e, converting the nuclear magnetic resonance T2 spectrum into a pore distribution curve by using a conversion relational expression between the transverse relaxation time T2 and the pore diameter R value and a conversion relational expression between the nuclear magnetic resonance porosity component and the pore volume of the unit mass sample. The method only needs to be carried out under the normal temperature condition, and the analysis cost is lower.

Description

technical field [0001] The invention relates to a method for converting coal seam nuclear magnetic resonance T2 spectrum and pore distribution, and belongs to the technical field of energy exploitation. Background technique [0002] The distribution and size of coal seam pores are of great significance to the evaluation of the development potential of coal bed methane. Coal seam pore size can generally be divided into three levels: large pores (pore radius greater than 30 nm), medium pores (pore radius 1.2–30 nm) and small pores (pore radius 0.4–1.2 nm). The content of methane gas present in coal seams is related to both pore volume and pore distribution. Small pores contribute the most to the specific surface area of ​​coal, and more than 90% of methane gas exists in small pores; methane gas exists as free gas or dissolves in water in large pores (cleats) or mesopores. Although the macropores and mesopores of coal seams make little contribution to the storage space of met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08G01N1/28
CPCG01N24/081G01N1/28
Inventor 余杰秦瑞宝黄涛张磊魏丹刘小梅李雄炎平海涛
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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