RES-scale shale equivalent three-dimensional pore parameter rapid extraction method

Abstract

The embodiment of the invention discloses a method for quickly extracting equivalent three-dimensional pore parameters of shale. The method comprises the following steps: acquiring a scanning electronmicroscope imaging image of a shale sample; selecting a segmentation threshold, and dividing the electron microscope image into four components; dividing the pores according to the size of a connected region; splicing the organic holes and the inorganic holes extracted from the large area and the small area; extracting parameters according to an image recognition result; converting the acquired two-dimensional plane parameters into equivalent three-dimensional parameters according to dimension raising transformation; and obtaining the sample area of the RES scale. According to the method, theprocessing speed is higher, the extraction result is more accurate, and more effective information data is obtained; the method is in favor of accurately evaluating the reservoir gas storage capacityand the transport capacity of shale, and can rapidly distinguish organic holes and inorganic holes and extractequivalent three-dimensional parameters. In addition, the method has the advantages of simple operation, automatic completion of calculation, high calculation efficiency, and strong applicability, and can analyze and research various shale samples.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of petroleum and natural gas geological exploration, and in particular to a method for quickly extracting equivalent three-dimensional pore parameters of RES-scale shale. Background technique [0002] The "shale gas revolution" has pushed the large-scale exploration and development of shale gas to an upsurge. 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. Because organic por...

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Problems solved by technology

[0006] (1) The existing processing methods have slow processing speed, low accuracy of extraction results, and limited acquisition of effective information and data, which is not conducive to accurately evaluating the gas storage capacity and transportation capacity of shale reservoirs;

[0007] (2) The existing processing methods cannot distinguish between organic pores and inorganic pores in shale, and cannot extract fractures separately, which is not conducive to accurate analysis and research on shale samples;

[0008] (3) The existing processing methods have low applicability and can only process some or better imaged shale samples, making the research results less convincing

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