Characterization method of shale pore structure
A pore structure and shale technology, applied in the field of natural gas exploration, can solve the problem that the organic matter pores and inorganic mineral pores in shale cannot be quantitatively characterized separately
Active Publication Date: 2018-12-21
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
[0004] At present, a large number of studies have been carried out on the characterization of the pore structure of shale reservoirs. Among them, the main quantitative characterization techniques are mercury injection method and gas adsorption method, but the results of these two test methods show the overall pore structure characteristics of shale. The pore structure characteristics of shale reservoirs can only be characterized from the perspective of pore size, and the organic pores and inorganic mineral pores in shale cannot be quantitatively characterized separately
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[0043] In this example, the pore characterization of the shale at 1274.9 meters in the Fuye 3 well in the Fuxian area of the Yanchang mining area in the Ordos Basin is carried out, including the following steps:
[0044] 1) Sample pretreatment
[0045] Cut the taken shale core into blocks with a length, width and thickness of approximately 1cm×0.5cm×0.5cm, and polish the surface with a length and width of 1cm×0.5cm as the observation surface, and use 80 mesh, 280 It takes about 30 minutes to polish with sandpaper of mesh, 600 mesh, 1000 mesh, 2000 mesh and 3000 mesh. The thickness of the sample is ground to about 0.2cm, and then the observation surface is finely polished with 5000 mesh sandpaper, which takes about 60 minutes. The entire sanding process is done in a circular motion.
[0046] 2) SEM processing
[0047] Place the metal stage on the heating stage, and set the temperature of the heating stage to 130°C. After the metal stage heats up, place a small amount of par...
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Abstract
The invention provides a shale pore structure characterization method. The shale pore structure characterization method comprises the following steps that 1, a shale subjected to polishing treatment is scanned by a scanning electron microscope to obtain a scanned electron microscope image; 2, matrixing processing is conducted on the scanned electron microscope image to obtain a shale grey level histogram, and binarization threshold segmentation is conducted on the shale grey level histogram to obtain a shale gray level image; 3, image enhancement processing is conducted on the gray level image to obtain an enhanced grey level image, edge detection is conducted on the enhanced grey level image by adopting a Canny operator edge detection method, various types of pores are marked by utilizing a bwlabel method, and basic parameters of various types of pores are extracted by adopting a regionprops method; 4, shale pore structure characterization parameters are obtained according to the basic parameters. By the adoption of the shale pore structure characterization method, shale pores are classified according to different development positions, and accordingly the shale gas storage capacity of the shale can be more objectively evaluated by characterizing the organic matter pores and inorganic mineral pores of the shale respectively.
Description
technical field [0001] The invention relates to natural gas exploration technology, in particular to a characterization method of shale pore structure. Background technique [0002] With the large-scale exploration and development of unconventional oil and gas, shale oil and gas, as a kind of unconventional oil and gas, has become the focus of attention, and the research on shale oil and gas is also deepening. The pore structure characteristics of shale reservoirs determine the gas adsorption capacity of shale, which is the focus of shale gas research. [0003] Shale is mainly composed of a large amount of organic matter and inorganic matter, and shale pores can be divided into organic matter pores and inorganic mineral pores according to different development positions. The pores developed on organic matter are organic matter pores, and the pores developed on inorganic matter are Inorganic mineral pores. The occurrence forms of shale gas are diverse and complex, including...
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IPC IPC(8): G01N15/08
CPCG01N15/08
Inventor 原园姜振学喻宸刘泽泓黄何鑫李卓冯洁王朋飞李廷微杨潇李卫兵
Owner CHINA UNIV OF PETROLEUM (BEIJING)