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Rapid evaluation method of shale pore structure

A technology of pore structure and evaluation method, which is applied in the field of pore structure of shale gas reservoirs, can solve the problems of inability to judge the pore structure of shale reservoirs, and the application effect is not obvious, and achieve the effect of simple and effective method.

Pending Publication Date: 2020-08-21
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

However, the application effect of these methods in actual production is not obvious, and the pore structure of shale reservoirs cannot be judged simply and quickly.

Method used

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  • Rapid evaluation method of shale pore structure
  • Rapid evaluation method of shale pore structure
  • Rapid evaluation method of shale pore structure

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Embodiment 1

[0023] Embodiment 1, low temperature nitrogen adsorption experiment

[0024] The low-temperature nitrogen adsorption experiment was carried out on the ASAP 2020 specific surface and pore analyzer, and the experimental temperature was maintained at -195 °C. Before the experiment, the Lower Cambrian Shuijingtuo Formation shale samples (10) were ground to 60-80 mesh, and dried in a drying oven at a constant temperature of 70°C for 10-12 hours. The pore surface area was calculated by the Brunauer Emmette Teller (BET) model, and the pore volume was calculated by the BarretteJoynere Halenda (BJH) model. The data obtained in this experiment are shown in Table 1, and the typical adsorption isotherms are shown in figure 1 .

[0025] Table 1. Nitrogen adsorption data

[0026]

Embodiment 2

[0027] Embodiment 2, the calculation of fractal dimension

[0028] to combine figure 1 , when the relative pressure is greater than 0.4, the adsorption and desorption curves do not overlap, indicating that the van der Waals force weakens at this time, and the capillary cohesion begins to play a dominant role. Therefore, we select the data with relative pressure between 0.4 and 1 to calculate the fractal dimension. Include the relative pressure (p / p 0 ) value and the corresponding adsorption volume (V), and then p 0 After taking the logarithm of / p and V, use ln(ln(p 0 / p)) is the abscissa and lnV is the ordinate, and a straight line is fitted to the data. The fitting straight line graph of ten samples is shown in figure 2 . Calculate the corresponding fractal dimension according to the slope of the fitted line, and the calculation method is D=3+K. The fitting line equation and fractal dimension value of each sample are shown in Table 2. The fractal dimension D of the 1...

Embodiment 3

[0031] Embodiment 3, characterization of fractal dimension to pore structure

[0032] The characterization parameters of the pore structure usually include average pore diameter, specific surface area, pore volume, etc. In order to study the relationship between fractal dimension and pore structure parameters, we made the correlation diagram between fractal dimension D and BET specific surface area and average pore diameter respectively, see image 3 . The data show moderate-strong correlations between fractal dimension and each of these parameters. Fractal Dimensions D and S BET There is a positive correlation between them, the larger the specific surface area, the higher the fractal dimension. There is a negative correlation between the fractal dimension D and the average pore size, the larger the average pore size, the lower the fractal dimension. It shows that with the decrease of the average pore diameter and the increase of the specific surface area, the fractal dime...

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Abstract

The invention discloses a rapid evaluation method of a shale pore structure. The rapid evaluation method comprises the following steps: establishing a nitrogen adsorption-desorption isotherm of a shale sample; calculating fractal dimensions; and characterizing and evaluating the pore structure of the shale by using the fractal dimension. Based on nitrogen adsorption experimental data, quantitativecharacterization and evaluation of the pore structure of shales are carried out according to fractal dimension indexes by means of the FHH fractal model, and the method has the beneficial effects that parameters for characterizing the complexity of the pore structure of the shale can be rapidly obtained, and the reservoir evaluation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of pore structure of shale gas reservoirs. More specifically, the present invention relates to a rapid evaluation method of shale pore structure. Background technique [0002] Shale gas is a kind of natural gas that mainly occurs in the pore-fracture network system of organic-rich shale in free and adsorbed states. It is a clean and efficient unconventional natural gas resource. my country has carried out shale gas exploration and development in continental, marine-terrestrial transitional, and marine organic-rich shale, mainly in the Sichuan Basin, Qinshui Basin, Jiaoshiba area, and Hubei Yichang area. In particular, the marine organic-rich black shale developed in the Paleozoic (mainly Silurian and Cambrian) in southern my country has the characteristics of large thickness, stable distribution, good type of organic matter, high abundance of organic matter, and high maturity. The pore structure of shale a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/02
CPCG06Q10/06393G06Q50/02
Inventor 严德天刘紫璇
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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