Complex rock fractal dimension distribution spectrum constructing method based on mercury intrusion method capillary pressure curve

A technology of tube pressure curve and fractal dimension, which is applied in the fields of petroleum engineering and petrophysics, and can solve problems such as difficult capillary pressure curve fitting

Inactive Publication Date: 2016-11-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Traditional fractal theory and fractal dimension calculation methods are difficult to fit the capillary pressure curves of complex rocks well, especially for rocks with extremely complex pore structures and strong heterogeneity, their capillary pressure curves Segmentation

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  • Complex rock fractal dimension distribution spectrum constructing method based on mercury intrusion method capillary pressure curve
  • Complex rock fractal dimension distribution spectrum constructing method based on mercury intrusion method capillary pressure curve
  • Complex rock fractal dimension distribution spectrum constructing method based on mercury intrusion method capillary pressure curve

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Embodiment Construction

[0041] In conjunction with the accompanying drawings, a method for constructing a complex rock fractal dimension distribution spectrum based on the capillary pressure curve of mercury injection method includes the following steps:

[0042] a Rock pretreatment, basic data acquisition and mercury injection experiment

[0043] a1 Drill, cut, and polish the rock into a plunger sample with a diameter of 2.54cm and a length of about 3-5cm. Put the sample into an oven, select a temperature of 95°C and keep it constant for 24 hours, take it out, and measure the sample with a vernier caliper The length and diameter of the sample are calculated to calculate the total volume of the sample; the mass of the sample is measured with an electronic balance.

[0044] a2 Put the sample into the gas porosity meter, use helium or nitrogen as the medium, apply Boyle's law to measure the pore volume of the sample, and calculate the sample porosity.

[0045] a3 Put the sample into the mercury porosi...

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Abstract

The invention discloses a complex rock fractal dimension distribution spectrum constructing method based on a mercury intrusion method capillary pressure curve. In the method, an accumulative formula with multiple fractal dimensions is constructed based on the power exponent relation between mercury injection saturability and mercury injection pressure, an iterative singular value decomposition algorithm is used for solution to obtain multiple ratios corresponding to the fractal dimensions, and then a fractal dimension distribution spectrum is obtained. Compared with a traditional fractal theory and model, the capillary pressure curve with segment and fractal features can be depicted meticulously through the complex rock fractal dimension distribution spectrum constructing method. In a traditional single fractal dimension method, only one fractal dimension is obtained for the capillary pressure curve of one sample, while multiple fractal dimensions and the ratios thereof can be obtained for the capillary pressure curve of one sample through the distribution spectrum constructing method, the fractal dimension distribution spectrum is constructed, and a new train of thought is brought for pore structure analysis and fractal representation of complex rock.

Description

technical field [0001] The invention relates to a method for constructing a complex rock fractal dimension distribution spectrum based on a capillary pressure curve of a mercury injection method, and belongs to the fields of petroleum engineering and rock physics. Background technique [0002] Since its development, fractal theory has been widely used in various fields of petroleum engineering and rock physics, and has become one of the important means to characterize rock pore structure, and has achieved good application results. [0003] The capillary pressure curve is an important basic data used by fractal theory to characterize the rock pore structure. In the past, a simple single fractal dimension model was usually constructed based on the power exponent relationship between saturation and pressure and solved by the least square method. With the further deepening of the research, the objects faced are becoming more and more complex. From simple sandstone with high poro...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N1/28G01N1/44
CPCG01N1/286G01N1/44G01N15/0886G01N2001/2873
Inventor 葛新民范宜仁韩玉娇岳海玲刘家雄丛云海
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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