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A method for constructing molecular model of shale composite organic matter

A molecular model and construction method technology, applied in the analysis of materials, analysis by nuclear magnetic resonance, material analysis by resonance, etc., can solve the problem of lack of organic multi-component composite molecular models, etc., to achieve good representation and strong transplantation. Effect

Active Publication Date: 2020-12-04
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0005] At present, there is a lack of research on multi-component composite molecular models of organic matter, so it is of great significance to design a set of construction methods for molecular structure models of shale composite organic matter

Method used

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  • A method for constructing molecular model of shale composite organic matter
  • A method for constructing molecular model of shale composite organic matter
  • A method for constructing molecular model of shale composite organic matter

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Embodiment 1

[0056] This example provides a method for constructing a molecular model of shale composite organic matter, which takes the shale samples of the Niutitang Formation in the Sichuan Basin as the research object. The specific construction process is as follows figure 1 shown, including the following steps:

[0057] (1) Take Niutitang Formation shale powder samples with a size of less than 200 mesh to carry out asphalt extraction experiments, calculate the organic asphalt content of shale, and separate the extracted asphalt samples to obtain asphaltenes, colloids, and aromatic hydrocarbons and saturated hydrocarbon components, the extracted shale samples were washed with deionized water, and the washed samples were dried in a vacuum drying oven to constant weight for later use. The component distribution diagram of the composite organic matter molecular model is as follows figure 2 shown.

[0058] (2) The inorganic minerals in the shale samples were removed by step-by-step pick...

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Abstract

The invention provides a building method for a shale composite organic molecular model. The method comprises the following steps of extracting asphalt sample components and a kerogen sample in a shalesample, and performing component analysis on an asphalt sample; performing element analysis, FTIR spectral analysis, 13C NMR spectrogram test and XPS energy spectrum analysis on the kerogen sample, and judging element composition, an atom ratio of carbon atoms to heteroatoms, functional group types, carbon skeleton structure parameters and existing forms of the heteroatoms in the kerogen sample;according to element analysis, FTIR spectral analysis, 13C NMR spectrogram test and XPS energy spectrum analysis results, constructing initial molecular structures of the kerogen sample; and determining the quantity of the initial molecular structures of kerogen, sample component distribution and organic light component distribution under a reservoir condition in the organic molecular model, and building the three-dimensional shale composite organic molecular model by adopting a molecular simulation technology, wherein the heteroatoms are atoms except carbon and hydrogen.

Description

technical field [0001] The invention belongs to the field of petrochemistry and relates to a method for constructing a shale compound organic matter molecular model. Background technique [0002] Shale gas is rich in resources and is an important alternative energy source for conventional oil and natural gas. However, the special reservoir conditions and seepage characteristics of shale gas reservoirs determine the characteristics of rapid natural decline and low natural production capacity of shale gas reservoirs. Currently, shale gas reservoirs are mostly developed by depletion, and the recovery rate is generally lower than 30%. How to recover more shale gas from shale gas reservoirs, especially adsorbed gas, is a hot and difficult point in the research on the development of shale gas reservoirs. [0003] Adsorbed gas is one of the main forms of shale gas, and its content can reach 60-85% of the total gas. Adsorbed gas mainly occurs in the nanoscale pores of shale organi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G16C10/00G01N24/08G01N23/2273G01N21/3563
CPCG01N21/3563G01N23/2273G01N24/081G01N2021/3595G16C10/00
Inventor 宁正福黄亮王庆陈志礼孙逢瑞林浩吕兆兰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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