鄂尔多斯盆地南缘延安组降解油砂地球化学特征及油源分析  

Geochemical characteristics and oil source analysis of degraded oil sands of the Yan'an Formation in the Southern Ordos Basin

作　　者：梁也 单玄龙[3] 何月顺[1,2] 宋英旭 张慧娟 冯灿翔 许庆鹏 LIANG Ye;SHAN Xuanlong;HE Yueshun;SONG Yingxu;ZHANG Huijuan;FENG Canxiang;XU Qingpeng(Jiangxi Engineering Technology Research Center of Nuclear Geoscience Data Science and System,East China University of Technology,Nanchang,Jiangxi 330013,China;School of Information Engineering,East China University of Technology,Nanchang,Jiangxi 330013,China;College of Earth Science,Jilin University,Changchun,Jilin 130061,China;School of Earth Sciences,East China University of Technology,Nanchang,Jiangxi 330013,China)

机构地区：[1]东华理工大学江西省核地学数据科学与系统工程技术研究中心,江西南昌330013 [2]东华理工大学信息与工程学院,江西南昌330013 [3]吉林大学地球科学学院,吉林长春130061 [4]东华理工大学地球科学学院,江西南昌330013

出　　处：《东北石油大学学报》2023年第5期49-60,I0004,共13页Journal of Northeast Petroleum University

基　　金：江西省核地学数据科学与系统工程技术研究中心开放基金项目(JETRCNGDSS202002);江西省教育厅科学技术研究项目(GJJ200743);东华理工大学江西省数字国土重点实验室开放研究基金资助项目(DLLJ202204)。

摘　　要：为完善鄂尔多斯盆地边缘地区油源认识,研究渭北隆起区延安组降解油砂地球化学特征和油源,通过GC-MS(气相色谱—质谱分析)等测试,分析油砂的有机质成熟度、有机质来源、古沉积环境和油源方向。结果表明:渭北隆起区延安组油砂油的成分中以饱和烃为主,非烃和沥青质次之,芳香烃最少,饱芳比和饱和烃质量分数高,油砂油品质较好;油砂油进入成熟阶段,有机质来源于高等植物和藻类,形成于水体盐度低、水体缺氧的湖相沉积环境;延长组7段半深湖—深湖相沉积的泥页岩是油砂的生油岩,油砂油由镇泾地区沿南东东方向运移,水洗和生物降解作用是运移过程中影响油砂油成分变化的主要因素。该结果对鄂尔多斯盆地南缘油气勘探有指导意义。An integrated analysis of the geochemical characteristics and oil sources of degraded oil sands in the Yan'an Formation in the Weibei Uplift was conducted in response to incomplete understanding of oil sources in the marginal areas of the Ordos Basin by means of GC-MS(gas chromatography Smass spectrometry)with the objective of investigating the maturity and source of organic matter,paleoenvironment,and migration direction of oil sands.The results show that saturated hydrocarbons are dominant in the composition of oil sands oil in the Yan'an Formation in the Weibei Uplift,followed by non-hydrocarbons and asphaltenes,and aromatic hydrocarbons are the least.The high saturation to aromaticity ratio indicates a superior quality of oil sands.Oil sands oil has entered a mature stage,with its organic matter derived from higher plants and algae,thus forming in a relatively low salinity,anoxic lacustrine environment.The shale deposited in the semi deep to deep lacustrine facies of the 7th member of the Yanchang Formation is the source rock for oil sands,and its oil migrates along the SEE direction from the Zhenjing Area,during which water washing and biodegradation are the main factors affecting changes in oil composition of oil sands.The research results can be regarded as a guidance for the exploration of oil sands in the Southern Ordos Basin.

关 键 词：渭北隆起区 延安组油砂 地球化学特征 油源 运移方向 鄂尔多斯盆地 

分 类 号：P593[天文地球—地球化学] TE122[天文地球—地质学]