大洋缺氧事件的陆相古环境与资源效应:松辽盆地晚白垩世页岩油层地球化学特征分析OA
Terrestrial paleoenvironment and related resources during Oceanic Anoxic Events:Geochemical analysis of Late Cretaceous shale oil strata in the Songliao Basin
[研究目的]松页油 1 井为松辽盆地首口获得基质型页岩油工业油流的探井.对其晚白垩世青山口组富有机质泥页岩进行研究,探讨全球大洋缺氧事件(OAE2)时期中国东北地区陆相湖盆黑色泥页岩形成的古环境及其页岩油资源潜力.[研究方法]对松页油 1 井青山口组一段泥页岩开展地球化学特征、环境(氧化还原条件、古盐度等指标)分析及地层含油气性测试.[研究结果]结果表明:古气候指标 CaO/(MgO×Al2O3)值在 0.01～1.29 之间,平均 0.10;氧化还原系数主体在 0.11～0.64 之间(平均 0.38),其他氧化还原指标 δU、V/Sc、V/(V+Ni)平均值分别为 1.17、8.23 和 0.80;古盐度指标的 B 含量、B/Ga、Sr/Ba 和 Th/U 主体平均值分别为 57.9×10-6、2.5、0.7 和 2.2,δ18O 值为-17.50‰～-15.58‰,δ13C 值为 0.26‰～2.00‰.[结 论]青山口组一段黑色泥页岩形成于暖热半湿润的湖泊淡水—微咸水(个别时期为海侵—咸水)的(缺氧)还原环境,记录了陆相湖盆沉积缺氧事件对 OAE2 的响应;同时,青山口组一段厚层暗色泥页岩还具有高的有机质含量,且 P、Cu 等对生物有益的元素与总有机碳含量具有较好的正相关性,展现了高的古湖盆生产力,为青山口组成提供了丰富的物质基础.地层含油气性测试证实,总有机碳是陆相页岩油成藏的主控因素之一,基质型页岩油储层潜力较大,松辽盆地青山口组陆相页岩油资源丰富.
[Objective]The SYY1 well is the first borehole to achieve industrial production of matrix-type shale oil from the thick shale and mudstone of the 1st Member of the Qingshankou Formation(Qing-1 Member)in the Songliao Basin.[Methods]Through geochemical analysis and stratigraphic oil and gas-bearing testing,this paper explores the paleoenvironment and shale oil resource potential of the black shale and mudstone formed in the lacustrine basin of Northeast China during the Oceanic Anoxic Event 2(OAE2).[Results]The paleoclimatic indicator CaO/(MgO×Al2O3)ranges from 0.01 to 1.29(average 0.10).The redox coefficient(K)predominantly falls between 0.11 and 0.64(average 0.38),while other redox proxies(δU,V/Sc and V/(V+Ni))yield mean values of 1.17,8.23,and 0.80,respectively.Paleosalinity indicators show mean values of 57.9×10-6 for B,2.5 for B/Ga,0.7 for Sr/Ba,and 2.2 for Th/U.The δ18O values range from-17.50‰ to-15.58‰,and δ13C values vary between 0.26‰ and 2.00‰.[Conclusions]The analysis of geochemical characteristics and environmental indicators suggests that the black shale and mudstone of the Qing-1 Member were formed in a warm,humid lacustrine environment with freshwater to slightly brackish conditions(occasionally influenced by seawater),within a reducing(anaerobic)environment.These conditions reflect the sedimentary response to OAE2 in terrestrial lacustrine anoxic event(LAE).Additionally,the thick,dark shale and mudstone in the Qing-1 Member have high total organic carbon(TOC)content,with a positive correlation between biologically beneficial elements such as phosphorus(P)and copper(Cu)and TOC,revealing extremely high productivity in the ancient lake basin.This provides a rich material basis for the Qing-1 Member in the Songliao Basin.Moreover,stratigraphic hydrocarbon testing has confirmed that TOC is one of the main controlling factors for shale oil accumulation in lacustrine environments.The matrix-type shale oil reservoirs exhibit significant potential,indicating abundant shale oil resources in the Qingshankou Formation of the Songliao Basin.
张德军;王广;陈树旺;孙雷;公樊浩;卞雄飞;孙守亮;张海华;沈斌;徐学敏
中国地质调查局沈阳地质调查中心,辽宁 沈阳 110034||中国地质科学院地质研究所,北京 100037||自然资源部辽西中生代地层系统野外科学观测研究站,辽宁 朝阳 122000国家地质实验测试中心,北京 100037中国地质调查局沈阳地质调查中心,辽宁 沈阳 110034中国地质调查局沈阳地质调查中心,辽宁 沈阳 110034中国地质调查局沈阳地质调查中心,辽宁 沈阳 110034中国地质调查局沈阳地质调查中心,辽宁 沈阳 110034中国地质调查局沈阳地质调查中心,辽宁 沈阳 110034中国地质调查局沈阳地质调查中心,辽宁 沈阳 110034国家地质实验测试中心,北京 100037国家地质实验测试中心,北京 100037
天文与地球科学
松辽盆地晚白垩世大洋缺氧事件古环境地球化学特征页岩油
Songliao BasinLate Cretaceousoceanic anoxic eventpalaeoenvironmentgeochemistry characteristicsshale oil
《地质通报》 2026 (4)
657-677,21
中国地质调查局项目《东北地区地层古生物地质调查》(编号:DD20230220)和国家自然科学基金项目《古生代—中生代重大转折期极端气候与生物响应》(批准号:42293280)、《大兴安岭中南部中侏罗世植物群及地层新探》(批准号:42172024)、《黑龙江嘉荫盆地晚白垩世中—晚期植物群演替及其古环境背景》(批准号:42172017),国家重点研发计划课题《白垩纪中期松辽盆地及邻区陆相储集层与烃源岩研究》(编号:2019YFC0605404) Supported by the project of China Geological Survey(No.DD20230220),National Natural Science Foundation of China(Nos.42293280,42172024,42172017)and National Key R&D Program of China(No.2019YFC0605404)
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