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Method for evaluating content of occurrence adsorbed methane existing in each component of shale reservoir

An adsorbed, shale technology, applied in the analysis of materials, material analysis using radiation diffraction, instruments, etc., can solve the problems of high cost and complicated method operation, and achieve the effect of low cost and easy operation.

Pending Publication Date: 2021-06-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Overcome the disadvantages of existing technologies and methods, which are complicated to operate and expensive

Method used

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  • Method for evaluating content of occurrence adsorbed methane existing in each component of shale reservoir
  • Method for evaluating content of occurrence adsorbed methane existing in each component of shale reservoir
  • Method for evaluating content of occurrence adsorbed methane existing in each component of shale reservoir

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Embodiment 1

[0024] Embodiment 1: as figure 1 A method for evaluating the amount of adsorbed methane in each component of a shale reservoir comprises the following steps;

[0025] Step 1: Prepare 5 sub-samples for the same core sample, including reservoir samples, kerogen-enriched samples, organic-matter-removed reservoir samples, clay mineral samples purified, and organic-matter and clay mineral-removed reservoir samples. The numbers of the sub-samples are 1, 2, 3, 4 and 5 respectively, wherein the sub-samples numbered 2 to 5 are prepared by the following methods respectively.

[0026] The 40-mesh mud shale reservoir sample was extracted with methanol and toluene to remove the solid bitumen in the sample, and then the residue was sequentially treated with HCl, HF and CrCl 2 The solution was soaked for more than 12 hours to remove carbonate minerals, silicate minerals and pyrite in the sample, and then the residue was washed with distilled water and dried at 80°C to obtain a sample enrich...

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Abstract

The invention discloses a method for evaluating the content of occurrence adsorbed methane in each component of a shale reservoir, and belongs to the field of natural gas exploration and development. The method is used for evaluating the content of occurrence adsorbed methane in each component of the shale reservoir under the conditions of each temperature and pressure. The method comprises the following steps: (1) preparing a reservoir sample for the same rock core sample, enriching kerogen, removing organic matters, purifying clay minerals, and removing sub-samples such as the organic matters and the clay minerals; (2) carrying out isothermal adsorption experiment analysis on TOC content, kerogen carbon element content, X-diffraction total rock, clay mineral relative amount and methane on the prepared sub-samples, and determining the mass of each component in a unit mass sample; (3) constructing an evaluation model for the content of the occurrence adsorbed gas of each component at different temperatures and under different pressures; (4) establishing an objective function by using a least square method to solve the content of the occurrence adsorbed methane of each component under different temperatures and pressures, and determining the Langmuir volume and pressure of each component; and (5) evaluating the content of the occurrence adsorbed methane of each component of the shale reservoir of the target interval at different temperatures and pressures.

Description

technical field [0001] The invention relates to a method for evaluating the amount of adsorbed methane in each component of a mud shale reservoir, belonging to the technical field of natural gas exploration and development. Background technique [0002] Shale gas is the accumulation of natural gas that mainly occurs in formations such as shale with hydrocarbon generation capacity in two states of adsorption and free. Adsorbed gas is one of the main occurrence modes of shale gas in shale gas reservoirs. Methane is the main shale gas in the high-maturity marine shale reservoirs in the Sichuan Basin and its surrounding areas. At present, geological researchers at home and abroad believe that the adsorbed gas content in shale gas reservoirs accounts for at least 40% of the total gas content in shale gas, especially in atmospheric shale gas reservoirs. The content of adsorbed gas plays a decisive role in the contribution of shale gas resources. In addition, as shale gas is expl...

Claims

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Application Information

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IPC IPC(8): G01N33/24G01N23/20G01N7/04
CPCG01N33/24G01N23/20G01N7/04
Inventor 丁雪陈方文于越海刘德才谭雅文郑强卢双舫
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)