{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,23]],"date-time":"2026-02-23T16:02:06Z","timestamp":1771862526021,"version":"3.50.1"},"reference-count":0,"publisher":"Geological Society of London","license":[{"start":{"date-parts":[[2026,2,11]],"date-time":"2026-02-11T00:00:00Z","timestamp":1770768000000},"content-version":"am","delay-in-days":0,"URL":"https:\/\/www.geolsoc.org.uk\/publications\/lyell-collection\/user-license-1-1"},{"start":{"date-parts":[[2027,2,11]],"date-time":"2027-02-11T00:00:00Z","timestamp":1802304000000},"content-version":"am","delay-in-days":363,"URL":"https:\/\/www.geolsoc.org.uk\/publications\/lyell-collection\/user-license-1-2"}],"funder":[{"DOI":"10.13039\/501100002858","name":"China Postdoctoral Science Foundation","doi-asserted-by":"publisher","award":["2023MD734109"],"award-info":[{"award-number":["2023MD734109"]}],"id":[{"id":"10.13039\/501100002858","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["42130803"],"award-info":[{"award-number":["42130803"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.lyellcollection.org"],"crossmark-restriction":true},"short-container-title":["PG"],"abstract":"<jats:p>High-quality source rocks exert primary control on hydrocarbon accumulation in continental lacustrine basins, particularly for tight sandstone oil reservoirs. The identity of the principal source rocks for Chang 7 tight oil in the Yanchang Formation, Ordos Basin, and their control mechanisms on accumulation and enrichment remain uncertain. This study integrates gas chromatography\u2013mass spectrometry (GC\u2013MS) analysis of mudstones, oil shales, and crude oils with hydrocarbon generation\u2013expulsion simulations, abnormal pressure calculations, and fluid inclusion trapping pressure reconstruction to establish oil\u2013source correlations, characterize primary source rocks, and define controlling accumulation mechanisms. Results demonstrate that: (1) Chang 7 tight oil was sourced predominantly from Chang 7 oil shales in a \"lower generation\u2013upper reservoir\" configuration. (2) These oil shales are laterally extensive with substantial thickness (&gt;15 m), high organic matter abundance (average TOC 11.36 wt.%), excellent kerogen quality (Types I and II\u2081), and moderate thermal maturity (average Ro 0.85%). (3) Cumulative hydrocarbon generation intensity averaged 159.46 \u00d7 10\u2074 t\/km\u00b2, providing abundant material for tight oil accumulation. (4) Source\u2013reservoir pressure differentials (SRPD) averaging 15.58 MPa provided the necessary driving force for efficient oil charging into tight reservoirs. (5) High-quality oil shale distribution directly governs tight oil distribution, with transitional zones between hydrocarbon generation centers and high-pressure domains representing optimal enrichment fairways. These findings clarify the fundamental role of lacustrine oil shales in tight oil systems and provide practical guidance for exploration in analogous continental basins.<\/jats:p>","DOI":"10.1144\/petgeo2025-076","type":"journal-article","created":{"date-parts":[[2026,2,11]],"date-time":"2026-02-11T10:15:58Z","timestamp":1770804958000},"update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Oil-source correlation and controlling effects of oil shale on tight oil accumulation in the Triassic Chang 7 Member, Longdong Area, Ordos Basin"],"prefix":"10.1144","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6785-2692","authenticated-orcid":true,"given":"Zhengjian","family":"Xu","sequence":"first","affiliation":[{"name":"School of Petroleum Engineering, Chongqing University of Science and Technology","place":["Chongqing, China"]},{"name":"Chongqing Institute of Geology and Mineral Resources","place":["Chongqing, China"]},{"name":"Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences)","place":["Wuhan, China"]},{"name":"Ministry of Education","place":["Wuhan, China"]},{"name":"Key Laboratory of Sedimentary Basin and Oil and Gas Resources, Ministry of Natural Resources","place":["Chengdu, China"]}]},{"given":"Xiaodong","family":"Hu","sequence":"additional","affiliation":[{"name":"School of Petroleum Engineering, Chongqing University of Science and Technology","place":["Chongqing, China"]}]},{"given":"Shu","family":"Jiang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences)","place":["Wuhan, China"]},{"name":"Ministry of Education","place":["Wuhan, China"]}]},{"given":"Xiaogang","family":"Li","sequence":"additional","affiliation":[{"name":"School of Petroleum Engineering, Chongqing University of Science and Technology","place":["Chongqing, China"]}]},{"given":"Enze","family":"Li","sequence":"additional","affiliation":[{"name":"School of Petroleum Engineering, Chongqing University of Science and Technology","place":["Chongqing, China"]}]},{"given":"Wenchao","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Petroleum Engineering, Chongqing University of Science and Technology","place":["Chongqing, China"]}]},{"given":"Weisong","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Petroleum Engineering, Chongqing University of Science and Technology","place":["Chongqing, China"]}]},{"given":"Nini","family":"Zhang","sequence":"additional","affiliation":[{"name":"Geologic Exploration & Development Research Institute, Chuanqing Drilling Co., Ltd., CNPC","place":["Chengdu, China"]}]},{"given":"Yingying","family":"Chen","sequence":"additional","affiliation":[{"name":"Henan Government Affairs Big Data Center","place":["Zhengzhou, China"]}]},{"given":"Xin","family":"Li","sequence":"additional","affiliation":[{"name":"Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences)","place":["Wuhan, China"]},{"name":"Ministry of Education","place":["Wuhan, China"]},{"name":"National Key Laboratory of Continental Shale Oil, Northeast Petroleum University","place":["Daqing, China"]}]}],"member":"1881","published-online":{"date-parts":[[2026,2,13]]},"container-title":["Petroleum Geoscience"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.lyellcollection.org\/doi\/pdf\/10.1144\/petgeo2025-076","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,2,23]],"date-time":"2026-02-23T15:08:13Z","timestamp":1771859293000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.lyellcollection.org\/doi\/10.1144\/petgeo2025-076"},"secondary":[{"URL":"https:\/\/pubs.geoscienceworld.org\/pg\/article\/doi\/10.1144\/petgeo2025-076\/725672\/oil-source-correlation-and-controlling-effects-of","label":"geoscienceworld"}]},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,2,13]]},"references-count":0,"alternative-id":["10.1144\/petgeo2025-076"],"URL":"https:\/\/doi.org\/10.1144\/petgeo2025-076","relation":{},"ISSN":["1354-0793","2041-496X"],"issn-type":[{"value":"1354-0793","type":"print"},{"value":"2041-496X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,2,13]]},"assertion":[{"value":"2025-07-31","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2025-12-12","order":1,"name":"revised","label":"Revised","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-02-03","order":2,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-02-13","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}],"article-number":"petgeo2025-076"}}