气候变化领域集成服务门户(CCPortal): Study on the Microscopic Fracture Process and Acoustic Emission of Shale Based on Digital Image

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DOI	10.1155/2021/8874918
	Study on the Microscopic Fracture Process and Acoustic Emission of Shale Based on Digital Image
	Tang M.; Wu Z.; Wang A.; Zuo Y.; Lou Y.; Liu H.; Sun W.
发表日期	2021
ISSN	14688115
卷号	2021
英文摘要	The Niutitang Formation shale is often filled with calcite minerals, which significantly affects the physical and mechanical properties of shale reservoirs. To correctly understand the microscale fracture characteristics of the Niutitang Formation shale and the evolution of acoustic emission signals, this paper uses digital image processing technology to characterize the geometric characteristics and nonuniform distribution of calcite minerals in the shale at the microscale and then maps it to finite elements; uniaxial compression tests of different calcite vein inclination angles are carried out on a microscale. The results show that under the microscale structure, the changes in compressive strength and brittleness index of the Niutitang Formation shale with different calcite vein dip angles are all N-shaped. The calcite veins affect the distribution of the stress field, leading to significant differences in the shale fracture process and fracture mode. The shale fracture process can be divided into two types. The first type (0°, 15°, 30°, 45°) is that the shale matrix is destroyed first, and then, the calcite veins are destroyed; the second type (60°, 75°, 90°) is that the calcite veins are destroyed first, and then, the shale matrix is destroyed. Shale fracture modes can be divided into w-type, v-type, inverted v-type, and inverted z-type. The inclination angle of calcite veins has a significant influence on the AE evolution characteristics of the Niutitang Formation shale. According to the characteristics of the AE active period, it can be divided into two types: surge type and step type. The surge type has a short active period, the number of AE count surges is small, the AE peak is large, and the failure mode is relatively simple. The step type has a long active period, the number of AE count surges is large, and the AE peak is small, and the failure mode is relatively complicated. The research results provide important theoretical guidance for shale gas fracturing mining. © 2021 Motian Tang et al.
scopus关键词	acoustic emission; carbon dioxide; carbon emission; compressive strength; digital image; hydrocarbon exploration; hydrocarbon reservoir; image analysis; reservoir characterization; shale
来源期刊	Geofluids
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/177294
作者单位	College of Civil Engineering, Guizhou University, Guiyang, 550025, China; School of Qilu Transportation, Shandong University, Jinan, 250002, China; Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, 250061, China; Guizhou Province Quality and Safety Traffic Engineering Monitoring and Inspection Center CO., LTD, Guiyang, 550025, China; Mining College, Guizhou University, Guiyang, Guizhou, 550025, China
推荐引用方式 GB/T 7714	Tang M.,Wu Z.,Wang A.,et al. Study on the Microscopic Fracture Process and Acoustic Emission of Shale Based on Digital Image[J],2021,2021.
APA	Tang M..,Wu Z..,Wang A..,Zuo Y..,Lou Y..,...&Sun W..(2021).Study on the Microscopic Fracture Process and Acoustic Emission of Shale Based on Digital Image.Geofluids,2021.
MLA	Tang M.,et al."Study on the Microscopic Fracture Process and Acoustic Emission of Shale Based on Digital Image".Geofluids 2021(2021).