Equivalent TOC calculation method based on shale scanning electron microscope image extraction

Abstract

The embodiment of the invention discloses an equivalent TOC calculation method based on shale scanning electron microscope image extraction, and the method comprises the following steps: carrying outthe sample processing and scanning imaging, and preprocessing an electron microscope image; threshold segmentation, dividing elements of the shale sample electron microscope image into four components; white edge identification and correction, and extracting organic matter skeleton content; converting two-dimensional plane parameters into equivalent three-dimensional parameters by utilizing dimension raising transformation; and calculating the equivalent TOC content of the shale sample. According to the method, the shale organic matter skeleton content is evaluated by adopting a digital imageprocessing method; the equivalent TOC content of the shale is calculated; the gas storage capacity and the transportation capacity of the shale reservoir can be accurately evaluated, meanwhile, the method is higher in universality, different types of shale samples with different electron microscope scanning imaging qualities can be researched, research is facilitated, in addition, the method is short in measurement period and simple in treatment process, and the test cost can be greatly reduced.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of petroleum and natural gas geological exploration, and in particular to an equivalent TOC calculation method based on shale scanning electron microscope image extraction. Background technique [0002] As a clean unconventional energy source, shale gas has huge reserves. The extraction of shale pore structure characteristics is the basis for accurate reserve evaluation and calculation of pore network migration capacity, and is also the focus of shale gas exploration and development research. The shale has complex composition and well-developed pore structure, and its main components are organic matter, inorganic matter and pyrite. Organic pores and organic cracks develop in organic matter; inorganic pores and inorganic cracks develop in inorganic matter. [0003] The TOC content of shale is generally obtained through combustion test method and well logging method. These are TOC anal...

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Problems solved by technology

[0005] (1) Existing shale TOC content extraction methods have inaccurate extraction results and insufficient mining of effective information, making it impossible to accurately evaluate the gas storage capacity and transport capacity of shale reservoirs, which brings great inaccuracy to the research work sex;

[0006] (2) The existing shale TOC content extraction methods have low applicability, and it is impossible to study shale samples of different types and different scanning electron microscope imaging quality, which is not conducive to the research;

[0007] (3) The existing shale TOC content extraction method has a long measurement period, complex processing process, and high cost, resulting in waste of resources

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