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After the water\u2013shale interaction, the rock mechanical parameters such as rock strength, elastic modulus, cohesion, and internal friction angle of shales significantly decrease as the imbibition time increases, indicating that the fluid has a strong influence on the mechanical properties of brittle shales. The stress\u2013strain curves of the wet and dry shales and their AE characteristics are quite different: (i) the stress\u2013strain curve of wet shale samples shows multiple fluctuations before macroscopic failure, and its cumulative AE number curve presents a step-like jump many times that corresponds to the local microcracking; (ii) the stress\u2013strain curve of dry shale samples mainly shows the characteristic of linear elastic deformation during early loading, which has less AE event number, and the step-like jump is not observed in all the AE curves. The dry shale only has a large number of AE events until it is close to macroscopic failure. Nuclear magnetic resonance, mineral composition, and microstructure analysis show that Chengkou shale generally develops micro\u2013nanoscale pores with a small pore throat, and thus strong capillary spontaneous absorption occurs. The shale\u2013water interaction includes both chemical and physical effects, which affect the key parameters such as acoustic velocity, frictional force on the surfaces of artificial fracture, fracability, and other mechanical properties. This paper provides new insights to the investigation on the formation mechanism of artificial fracture networks in brittle shales.<\/jats:p>","DOI":"10.1021\/acsomega.0c00452","type":"journal-article","created":{"date-parts":[[2020,4,7]],"date-time":"2020-04-07T18:57:02Z","timestamp":1586285822000},"page":"8847-8857","source":"Crossref","is-referenced-by-count":18,"title":["Insights into the Effect of Spontaneous Fluid Imbibition\non the Formation Mechanism of Fracture Networks in Brittle Shale:\nAn Experimental Investigation"],"prefix":"10.1021","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3579-7227","authenticated-orcid":true,"given":"Daobing","family":"Wang","sequence":"first","affiliation":[{"name":"Beijing Institute of Petrochemical Technology , , ,","place":["Beijing, People\u2019s Republic of China, 102617"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoqiong","family":"Wang","sequence":"additional","affiliation":[{"name":"China University of Petroleum , , ,","place":["Beijing, People\u2019s Republic of China, 102249"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongkui","family":"Ge","sequence":"additional","affiliation":[{"name":"China University of Petroleum , , ,","place":["Beijing, People\u2019s Republic of China, 102249"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dongliang","family":"Sun","sequence":"additional","affiliation":[{"name":"Beijing Institute of Petrochemical Technology , , ,","place":["Beijing, People\u2019s Republic of China, 102617"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bo","family":"Yu","sequence":"additional","affiliation":[{"name":"Beijing Institute of Petrochemical Technology , , ,","place":["Beijing, People\u2019s Republic of China, 102617"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2020,4,7]]},"reference":[{"key":"2026092109073054100_cit1","doi-asserted-by":"publisher","first-page":"475","DOI":"10.1306\/12190606068","article-title":"Unconventional\nshale-gas systems: The Mississippian Barnett Shale of north-central\nTexas as one model for thermogenic shale-gas assessment","volume":"91","author":"Jarvie","year":"2007","journal-title":"AAPG Bull."},{"key":"2026092109073054100_cit2","doi-asserted-by":"publisher","first-page":"182","DOI":"10.1016\/S1876-3804(16)30022-2","article-title":"Shale gas\nin China: Characteristics, challenges and prospects (II)","volume":"43","author":"Zou","year":"2016","journal-title":"Pet. 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