{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T17:08:09Z","timestamp":1790096889121,"version":"4.0.1"},"reference-count":85,"publisher":"American Chemical Society (ACS)","issue":"37","license":[{"start":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T00:00:00Z","timestamp":1788825600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100010903","name":"Key Programme","doi-asserted-by":"publisher","award":["42430810"],"award-info":[{"award-number":["42430810"]}],"id":[{"id":"10.13039\/501100010903","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,22]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Significant discrepancies in in situ gas content and occurrence characteristics exist among different siliceous shale subfacies of the Wufeng\u2013Longmaxi Formation, yet the underlying controlling mechanisms remain poorly understood, particularly in normal-pressure shale gas reservoirs. This study systematically investigated the gas-bearing heterogeneity and its dominant controls in the Anchang syncline, a representative normal-pressure block in northern Guizhou. A suite of laboratory analyses, including TOC determination, XRD mineralogy, FE-SEM, low-temperature N2 adsorption, and high-pressure methane adsorption, were employed. The results indicate that siliceous shales are divided into mixed-siliceous shale facies (S-2) and clay-bearing siliceous shale facies (S-4). S-2 is dominated by organic matter pores, exhibiting a higher total pore volume and specific surface area. In contrast, S-4 features abundant clay-related inorganic pores with underdeveloped organic pores. S-2 demonstrates superior methane adsorption capacity, with an average maximum absolute adsorption capacity of 3.676 cm3\/g compared to 3.456 cm3\/g for S-4. The TOC content and hydrophilic clay mineral proportion are the primary controls on adsorption capacity. SDR model results reveal that S-2 has a higher average in situ total gas content of 4.293 cm3\/g with an adsorbed gas ratio of 79.27%, while S-4 averages 3.622 cm3\/g with an adsorbed gas ratio of 87.47% and limited free gas. Gas-bearing properties are synergistically controlled by TOC, pore structure, mineral composition, and water saturation. Crucially, the higher water saturation of S-4, driven by its clay-rich composition, allows water to easily invade pores under normal-pressure conditions, weakening capillary sealing and causing a far more severe free gas loss than in S-2. Integrated analysis reveals that S-2 displays superior gas-bearing properties and more favorable occurrence conditions, positioning it as the prime exploration target in the Anchang syncline.<\/jats:p>","DOI":"10.1021\/acsomega.6c07112","type":"journal-article","created":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T18:01:56Z","timestamp":1788890516000},"page":"56296-56313","source":"Crossref","is-referenced-by-count":0,"title":["Occurrence Patterns\nand Controlling Mechanisms of\nIn Situ Gas Content in Varied Marine Siliceous Shale Subfacies: A\nCase Study of the Wufeng\u2013Longmaxi Formation in the Anchang\nSyncline, Northern Guizhou, China"],"prefix":"10.1021","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-7032-1289","authenticated-orcid":true,"given":"Ming","family":"Xie","sequence":"first","affiliation":[{"name":"China University of Geosciences (Beijing) , , ,","place":["Beijing, China, 100083"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shaobin","family":"Guo","sequence":"additional","affiliation":[{"name":"China University of Geosciences (Beijing) , , ,","place":["Beijing, China, 100083"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiliang","family":"Yu","sequence":"additional","affiliation":[{"name":"China University of Petroleum (Beijing) , , ,","place":["Beijing, China, 102249"]},{"name":"Guizhou Wujiang Energy Investment Co., Ltd , ,","place":["Guizhou, China, 550025"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Deqiang","family":"Sun","sequence":"additional","affiliation":[{"name":"Institutes of Science and Development, Chinese Academy of Sciences , ,","place":["Beijing, China, 100190"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hailong","family":"Li","sequence":"additional","affiliation":[{"name":"Guizhou Shale Gas Exploration and Development Co., Ltd , ,","place":["Zunyi, China, 563400"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gangquan","family":"Li","sequence":"additional","affiliation":[{"name":"Guizhou Shale Gas Exploration and Development Co., Ltd , ,","place":["Zunyi, China, 563400"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinbing","family":"He","sequence":"additional","affiliation":[{"name":"Guizhou Shale Gas Exploration and Development Co., Ltd , ,","place":["Zunyi, China, 563400"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,8]]},"reference":[{"key":"2026092211031827600_cit1","doi-asserted-by":"publisher","first-page":"146196","DOI":"10.1016\/j.cej.2023.146196","article-title":"Methane adsorption of nanocomposite\nshale in the presence of water: Insights from molecular simulations","volume":"475","author":"Babaei","year":"2023","journal-title":"Chem. 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Y.\n          \n          Shale gas enrichment\nelements and model of Wufeng-Longmaxi Formation in Anchang Syncline,\nNorthern Guizhou dissertation; China University\nOf Geosciences, 2024."},{"issue":"12","key":"2026092211031827600_cit29","first-page":"2184","article-title":"Micro-layer division, comparative evaluation, and target window optimization\nof horizontal well of marine high-quality shale gas intervals in residual\nsyncline outside Sichuan Basin","volume":"35","author":"Lan","year":"2024","journal-title":"Nat. Gas Geosci."},{"issue":"2","key":"2026092211031827600_cit30","first-page":"58","article-title":"Characteristics\nand main controlling factors for normal pressure shale gas reservoir\nin Anchang syncline in northern Guizhou","volume":"29","author":"Li","year":"2024","journal-title":"China\nPet. Explor."},{"issue":"5","key":"2026092211031827600_cit31","first-page":"56","article-title":"Shale gas\ncomposition and gas bearing characteristics of Wufeng-Longmaxi\nFormation in Zheng\u2019an area, Guizhou Province","volume":"42","author":"Wu","year":"2024","journal-title":"Guizhou Sci."},{"issue":"5","key":"2026092211031827600_cit32","first-page":"615","article-title":"Carbon isotopic characteristics while\ndrilling and the geological significance of Wufeng-Longmaxi Formation\nshale gas in the Zheng\u2019an area of northern Guizhou Province","volume":"52","author":"Wu","year":"2023","journal-title":"Geochimica"},{"key":"2026092211031827600_cit33","doi-asserted-by":"publisher","first-page":"2021","DOI":"10.3389\/feart.2021.802142","article-title":"Investigation of the enrichment and accumulation of\nnormal pressure shale gas in anchang syncline outside of Sichuan Basin","volume":"9","author":"Lan","year":"2022","journal-title":"Front. Earth Sci."},{"issue":"1","key":"2026092211031827600_cit34","first-page":"1","article-title":"Peservoir-forming\npattern of \u201cfour-storey\u201d hydrocarbon accumulation in\nAnchang syncline of northern Guizhou Province","volume":"44","author":"Zhai","year":"2017","journal-title":"Geol. China"},{"issue":"5","key":"2026092211031827600_cit35","first-page":"28","article-title":"Dynamic accumulation evolution of shale gas in strongly reformed\nsyncline-type structures based on basin modeling","volume":"32","author":"Lan","year":"2025","journal-title":"Spec. Oil Gas Res."},{"issue":"4","key":"2026092211031827600_cit36","first-page":"121","article-title":"Preservation of shale gas in Lower Silurian Longmaxi Formation in\nAnchang Syncline unit in Northern Guizhou, South China","volume":"35","author":"Lei","year":"2016","journal-title":"Bull. Geol. Sci. 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Eng."},{"issue":"5","key":"2026092211031827600_cit39","first-page":"605","article-title":"Main controlling\nfactors on normal pressure shale gas enrichments in Wufeng-Longmaxi\nFormations in synclines, southeastern Sichuan Basin","volume":"30","author":"Hu","year":"2019","journal-title":"Nat. Gas Geosci."},{"key":"2026092211031827600_cit40","first-page":"20","article-title":"Relationship between the reflectance of bitumen and\nvitrinite in rock","volume":"3","author":"Feng","year":"1988","journal-title":"Nat. Gas Ind."},{"key":"2026092211031827600_cit41","doi-asserted-by":"publisher","first-page":"35","DOI":"10.3787\/j.issn.1000-0976.2021.09.004","article-title":"Geological characteristics and resource\nprospect of\ndeep marine shale gas in the southern Sichuan Basin","volume":"41","author":"Zhang","year":"2021","journal-title":"Nat. Gas Ind."},{"key":"2026092211031827600_cit42","first-page":"59","article-title":"Sedimentary\nenvironment and shale gas resource potential of source rocks of Wufeng\nFormation in northern Guizhou","volume":"40","author":"He","year":"2022","journal-title":"Guizhou Sci."},{"key":"2026092211031827600_cit43","first-page":"1412","article-title":"Reservoir\ngas-bearing characteristics\nand their controlling factors of Wufeng-Longmaxi formations in northern\nGuizhou","volume":"34","author":"Zhang","year":"2023","journal-title":"Nat. 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