摘要
以准噶尔盆地玛湖凹陷下二叠统风城组页岩为例,综合岩心观察、测试分析、地质剖析和数值模拟等方法,识别页岩层系石油微运移现象,采用自主研发的排烃潜力法定量评价页岩油微运移烃量并进行了可靠性验证,指出页岩油微运移评价的石油地质意义。研究表明:页岩层系富有机质纹层和贫有机质纹层之间存在明显的页岩油微运移,富有机质纹层生烃能力强,生成烃类的重质组分优先与干酪根溶胀或吸附滞留,轻组分以游离态运移到与其互层的长英质或碳酸盐贫有机质纹层富集;玛页1井风城组69%的页岩存在外来运移烃的充注,31%的页岩发生了排烃作用。综合基于地质色层效应的族组分、二维核磁共振以及无机锰元素在烃类运移过程中的地球化学行为等分析,验证了微运移评价结果的可靠性;微运移是连接页岩层系各个油气聚集要素的桥梁,贯穿页岩油从生成、排出到富集的全过程,影响页岩油的含量和组分。页岩油微运移识别与评价结果,将为揭示页岩油动态差异富集机制、建立页岩“多级生油高峰”模式提供新视角。
Taking the Lower Permian Fengcheng Formation shale in Mahu Sag of Junggar Basin as an example,core observation,test analysis,geological analysis and numerical simulation were applied to identify the shale oil micro-migration phenomenon.The hydrocarbon micro-migration in shale oil was quantitatively evaluated and verified by a self-created hydrocarbon expulsion potential method,and the petroleum geological significance of shale oil micro-migration evaluation was determined.Results show that significant micro-migration can be recognized between the organic-rich lamina and organic-poor lamina.The organic-rich lamina has strong hydrocarbon generation ability.The heavy components of hydrocarbon preferentially retained by kerogen swelling or adsorption,while the light components of hydrocarbon were migrated and accumulated to the interbedded felsic or carbonate organic-poor laminae as free oil.69%of the Fengcheng Formation shale samples in Well MY1 exhibit hydrocarbon charging phenomenon,while 31%of those exhibit hydrocarbon expulsion phenomenon.The reliability of the micro-migration evaluation results was verified by combining the group components based on the geochromatography effect,two-dimension nuclear magnetic resonance analysis,and the geochemical behavior of inorganic manganese elements in the process of hydrocarbon migration.Micro-migration is a bridge connecting the hydrocarbon accumulation elements in shale formations,which reflects the whole process of shale oil generation,expulsion and accumulation,and controls the content and composition of shale oil.The identification and evaluation of shale oil micro-migration will provide new perspectives for dynamically differential enrichment mechanism of shale oil and establishing a“multi-peak model in oil generation”of shale.
作者
胡涛
姜福杰
庞雄奇
刘远
吴冠昀
周阔
肖惠译
姜振学
黎茂稳
蒋恕
黄立良
陈冬霞
孟庆洋
HU Tao;JIANG Fujie;PANG Xiongqi;LIU Yuan;WU Guanyun;ZHOU Kuo;XIAO Huiyi;JIANG Zhenxue;LI Maowen;JIANG Shu;HUANG Liliang;CHEN Dongxia;MENG Qingyang(National Key Laboratory of Petroleum Resources and Engineering,Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;Unconventional Petroleum Research Institute,China University of Petroleum(Beijing),Beijing 102249,China;Sinopec Petroleum Exploration and Production Research Institute,Beijing 100083,China;Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,China University of Geosciences(Wuhan),Wuhan 430074,China;Research Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Karamay 834000,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China)
出处
《石油勘探与开发》
EI
CSCD
北大核心
2024年第1期114-126,共13页
Petroleum Exploration and Development
基金
国家自然科学基金项目(42202133,42072174,42130803,41872148)
中国石油科技创新基金(2023DQ02-0106)。
关键词
页岩油
微运移识别
微运移评价
准噶尔盆地
玛湖凹陷
下二叠统
风城组
排烃潜力法
shale oil
micro-migration identification
micro-migration evaluation
Junggar Basin
Mahu Sag
Lower Permian
Fengcheng Formation
hydrocarbon expulsion potential method
