Shale organic matter pore connectivity classification characterization method

A technology of organic matter and connectivity, applied in the field of oil and gas exploration, can solve problems such as quantitative distinction, and achieve the effect of overcoming poor representation
CN113706603AActive Publication Date: 2021-11-26INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
Publication Date
2021-11-26

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Abstract

The invention belongs to the technical field of oil-gas exploration, aims to research development characteristic laws of organic matter pores and obtain reliable characterization information of organic matter pore connectivity, and particularly relates to a shale organic matter pore connectivity classification characterization method. A scanning electron microscope is used for scanning a shale sample in a preset imaging area and obtains a two-dimensional image of the shale sample; pore parameters of each organic matter in the two-dimensional image are extracted by adopting Avizo software; a type value of the organic matter set is obtained according to the pore parameters; three-dimensional reconstruction is performed on each type of organic matter set by adopting a focused ion beam-helium ion microscope to obtain an organic matter three-dimensional reconstructed body; avizo software is adopted to obtain pore connectivity parameters; and on the basis of the pore connectivity parameter, an overall connectivity evaluation index of the shale organic matter pores is obtained. According to the method, on the basis of organic matter pore morphology quantitative classification, three-dimensional connectivity characterization of sub-10nm-level pores can be achieved.
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Description

technical field

[0001] The invention belongs to the technical field of oil and gas exploration, and in particular relates to a method for classification and characterization of shale organic matter pore connectivity. Background technique

[0002] Organic pores are the main matrix pores in shale, and the connectivity of organic pores fundamentally affects the desorption-diffusion flow process of shale gas. Therefore, quantitative characterization of organic matter pore connectivity is of great significance for evaluating shale gas development potential, optimizing shale gas development plan, and improving shale gas recovery.

[0003] Currently, the characterization of shale connectivity mainly uses mercury porosimetry, nano-CT, and focused ion beam-scanning electron microscopy (FIB-SEM). Among them, the fluid properties and gas properties of mercury used in the mercury intrusion method are too different, the interaction between the fluid and the surface is different, and the...

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