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This study presents an integrated, multimethod investigation of Lower Jurassic low-rank coal, low-maturity shale, and tight sandstone from the Fukang area, Junggar Basin, China. High-pressure mercury intrusion porosimetry (HMIP), low-temperature N2\/CO2 adsorption, and low-field nuclear magnetic resonance (LF-NMR) were applied to quantify pore geometry, connectivity, and heterogeneity across nano\u2013micro\u2013macro scales. FHH and Brooks\u2013Corey models were applied to evaluate pore heterogeneity and connectivity. Results reveal marked lithology-dependent contrasts. Shale is dominated by micropores (\u223c50%) with limited connectivity, functioning primarily as an adsorption reservoir. Coal exhibits a high proportion of medium-to-large pores (macropores \u223c42.7%), comprising well-connected through\/linked pores and ink-bottle geometries, facilitating both gas storage and migration. Tight sandstone presents multimodal pore-throat distributions, ranging from well-connected, low-displacement-pressure bodies to fine-throat, poorly connected bodies. LF-NMR and HMIP consistently indicate that coal and well-connected sandstones dominate fluid transport, whereas shale micropores contribute minimally to mobility. Fractal analysis quantifies multiscale heterogeneity: fractal parameters obtained from low-relative-pressure regions (D1) are highest in coal (\u223c2.76), intermediate in tight sandstone (\u223c2.66), and lowest in shale (\u223c2.57), while fractal parameters obtained from high-relative-pressure regions (D2) peak in tight sandstone (\u223c2.72), reflecting complex internal pore-throat networks. Brooks\u2013Corey analysis reveals that wide-throat complexity primarily controls permeability. This multitechnique, fractal-based framework establishes a robust, cross-lithology methodology for evaluating pore connectivity, storage\u2013flow partitioning, and production potential. The results offer transferable insights for continental unconventional reservoirs with heterogeneous pore systems.<\/jats:p>","DOI":"10.1021\/acsomega.6c04105","type":"journal-article","created":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T18:02:15Z","timestamp":1788890535000},"page":"55625-55646","source":"Crossref","is-referenced-by-count":0,"title":["Multiscale Pore\nArchitecture and Fractal Heterogeneity of Coal, Shale, and Tight Sandstone:\nAn Integrated HMIP\u2013N2\/CO2 Adsorption\u2013NMR\nCharacterization Framework"],"prefix":"10.1021","volume":"11","author":[{"given":"Jie","family":"Xiang","sequence":"first","affiliation":[{"name":"Ordos Institute of Technology , ,","place":["Ordos, China, 017000"]},{"name":"China University of Mining and Technology (Beijing) , , ,","place":["Beijing, China, 100083"]},{"name":"China University of Mining and Technology (Beijing) , , ,","place":["Beijing, China, 100083"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2806-1353","authenticated-orcid":true,"given":"Jiandong","family":"Li","sequence":"additional","affiliation":[{"name":"Hebei Minzu Normal University , ,","place":["Chengde, China, 067000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5690-4012","authenticated-orcid":true,"given":"Xianqing","family":"Li","sequence":"additional","affiliation":[{"name":"China University of Mining and Technology (Beijing) , , ,","place":["Beijing, China, 100083"]},{"name":"China University of Mining and Technology (Beijing) , , ,","place":["Beijing, China, 100083"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaomin","family":"Ma","sequence":"additional","affiliation":[{"name":"China University of Mining and Technology (Beijing) , , ,","place":["Beijing, China, 100083"]},{"name":"China University of Mining and Technology (Beijing) , , ,","place":["Beijing, China, 100083"]},{"name":"China Coal Technology and Engineering Group Shenyang Research Institute , ,","place":["Shenyang, China, 113122"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhuo","family":"Zou","sequence":"additional","affiliation":[{"name":"General Prospecting Institute of China National Administration of Coal Geology , ,","place":["Beijing, China, 100039"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jie","family":"Sun","sequence":"additional","affiliation":[{"name":"General Prospecting Institute of China National Administration of Coal Geology , ,","place":["Beijing, China, 100039"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,8]]},"reference":[{"issue":"10","key":"2026092210585082700_cit1","doi-asserted-by":"publisher","first-page":"3967","DOI":"10.1016\/j.petsci.2025.07.023","article-title":"Thermal maturity effect on the microscopic pore structure and gas\nadsorption capacity of shale gas reservoirs: A review","volume":"22","author":"Xie","year":"2025","journal-title":"Pet. 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