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Digital reconstruction method of multi-level rock core structure

A multi-level, core technology, applied in the direction of image data processing, 2D image generation, suspension and porous material analysis, etc., can solve the problem that the structure and flow state cannot be obtained

Active Publication Date: 2020-04-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional experimental process is difficult to reconstruct the porous structure of other scales, and the specific flow state in the structure cannot be obtained.

Method used

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  • Digital reconstruction method of multi-level rock core structure
  • Digital reconstruction method of multi-level rock core structure
  • Digital reconstruction method of multi-level rock core structure

Examples

Experimental program
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Embodiment 1

[0051] In this embodiment, the method for reconstructing the two-dimensional structure of the multi-level digital core based on the two-dimensional structure of the real core is carried out according to the following steps:

[0052] 1) Select the real core of Changqing Oilfield, and scan the structure of the core by scanning electron microscope imaging SEM;

[0053] 2) Use Matlab to image-process the scanned core structure to extract the particle size (mineral particle size) and porosity: the large particles are selected as particles formed by quartz and feldspar, and their characteristic particle sizes are 250 μm and 200 μm, respectively. Select the small particles as particles formed by kaolinite, the particle size is 10 μm; the porosity is 12%;

[0054] 3) Digitally reconstruct the real reservoir core, and use the four-parameter random generation method (QuartetStructure Generation Set, QSGS) to generate a large-scale pore structure generated by the accumulation of large pa...

Embodiment 2

[0060] The flow of this embodiment is the same as that of Embodiment 1, except that a three-dimensional structure is generated.

[0061] The parameters used to generate the three-dimensional structure are the parameters obtained from the two-dimensional SEM image in Example 1: particle size (particle size of mineral particles) and porosity.

[0062] from image 3 As can be seen in , parameters derived from 2D SEM images can also be used to generate 3D multilevel digital structures. The generated three-dimensional structure ensures that the large particle size is 258 μm and 210 μm, and the small particle size is 12 μm, which is consistent with the real core parameters. In addition, the particle volume ratio and porosity can be strictly guaranteed to be consistent with the real core, which are 53% and 30% respectively. 5% versus 12%. Compared with the generated 2D digital structure, the 3D structure can better maintain the connectivity of the real structure under the same poro...

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Abstract

The invention relates to a digital reconstruction method of a multi-level rock core structure. The digital reconstruction method comprises the steps of: firstly, grading rock particles according to different particle sizes of the rock particles in a real oil reservoir rock core and different volume ratios of rock particle volumes to the whole rock volume, so as to form two or more levels of rock particles; secondly, adopting a four-parameter random generation method to generate a pore structure formed by first-stage large particle accumulation in the digital reconstruction process of the rockcore structure, and generating pore structures of corresponding particle sizes formed by stacking the rock particles of the level in the generated pore structure in sequence for the next level rock particles, so that the porosity and the feature size of the digital reconstruction rock core structure conform to the porosity and the feature size of a real rock core. By adopting the reconstruction method provided by the invention, corresponding generation can be carried out only through the size and volume distribution of the particles, and in addition, the reconstruction method has the advantages of low cost, high speed and the like.

Description

technical field [0001] The invention relates to the field of new energy and high-efficiency energy-saving, in particular to the field of exploration, development and utilization of oil and natural gas, in particular to a digital reconstruction method for a multi-layer core structure. Background technique [0002] Oil and gas resources are related to energy security, and their production needs to be steadily increased. The method of enhancing oil recovery is an important means. At present, the mechanism of enhanced oil recovery is unclear, especially the mechanism of multiphase flow in complex porous media, which seriously affects the development and application of related enhanced oil recovery technologies and methods. [0003] The traditional experimental process is like a black box, unable to obtain the specific flow state in the structure, which brings a lot of inconvenience to the study of multiphase seepage mechanism. In contrast, microscopic model experiments, 3D-pri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02G01N15/08G06T11/00G06T17/00
CPCG01N15/02G01N15/0272G01N15/08G01N2015/0288G01N2015/0833G06T11/00G06T11/003G06T17/00
Inventor 王沫然刘通雷文海
Owner TSINGHUA UNIV
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