鄂尔多斯盆地南梁西区延长组烃源岩生物标志物特征研究  

Characteristics of Biomarker of Source Rocks of Yanchang Formation in the West of Nanliang Area in Ordos Basin

作　　者：赵天林 罗静兰[2] 李杪[2] 白雪晶[2,3] Zhao Tianlin;Luo Jinglan;Li Miao;Bai Xuejing(Geological Survey Co.Ltd.,Sino Shaanxi Nuclear Industry Group,Xi'an 710100,Shanxi;State Key Laboratory of Continental Dynamics(Northwest University),Xi'an 710069,Shaanxi;No.5 Oil Production Plant,Daqing Oilfield Co.Ltd.,Daqing 163513,Heilongjiang)

机构地区：[1]中陕核工业集团地质调查院有限公司,陕西西安710100 [2]大陆动力学国家重点实验室(西北大学),陕西西安710069 [3]中石油大庆油田有限责任公司第五采油厂,黑龙江大庆163513

出　　处：《长江大学学报（自然科学版）》2019年第1期6-14,I0001,共10页Journal of Yangtze University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(41272138);国家科技重大专项(2011ZX05008-004-61)

摘　　要：通过正构烷烃、类异戊二烯烷烃、萜烷、甾烷等生物标志物的研究,对鄂尔多斯盆地南梁西区延长组的沉积环境、烃源岩有机质类型、成熟度等进行了评价。结果表明,氯仿沥青"A"质量分数已达到好烃源岩标准,族组分中可溶烃类质量分数较高,有机质类型好,烃源岩姥植比(Pr/Ph)绝大部分小于1,显示植烷优势,反映烃源岩沉积和保存于缺氧、弱还原～还原环境,有利于有机质的富集;升藿烷指数指示烃源岩沉积和保存于缺氧、弱还原～还原的湖相环境,沉积介质主要为淡水～微咸水。有机质来源具有低等水生生物和陆源高等植物双重输入特征,长6～长8油层组烃源岩有机质来源相似,以水生生物略占优势;绝大部分烃源岩处于成熟阶段,部分长9油层组样品或已达高成熟阶段,有利于油气的生成。Based on a study of biomarkers such as n-alkanes,isoprenoid alkenes,terpane and sterane,the sedimentary environment,the organic matter type and maturity of source rocks of Yanchang Formation in the West Nanliang Area of Ordos Basin were evaluated.The results show that the content of chloroform bitumen “A” has reached the standard of good source rocks,and the content of soluble hydrocarbon in the group composition was higher with good organic type.Pr/Ph ratios of most source rocks were lower than 1,and the advantage was distinct,it showed that sedimentation of Yanchang Formation occurred in the weakly reductive-reductive environment,which was beneficial for the enrichment of organic matters.Low Cariine indexes showed that the source rocks were deposited and preserved in anoxic,weakly reductive-reductive of lacustrine environment.The sedimentary medium were mainly fresh water and brackish water.The organic matter of source rocks has dual characteristics,and the provenance was terrigenous higher plants and aquatic organisms.Chang-6 to Chang-8 source rocks had the similar origin,which was mainly from aquatic organisms.The parameters of Ts/Tm,terpane and C29 sterane show that most of the hydrocarbon source rocks have reached the mature stage,and part of Chang-9 source rock has reached high mature stage,which is beneficial for hydrocarbon generation.

关 键 词：生物标志化合物 烃源岩 延长组 南梁西区 鄂尔多斯盆地 

分 类 号：P539[天文地球—古生物学与地层学]