流体定年方法在油气成藏历史研究中的应用——以鄂尔多斯盆地姬塬地区长6油层为例  

Applying Fluid Geochronology for Hydrocarbon Accumulation History in Chang6 Member of Jiyuan Area,Ordos Basin

作　　者：李艳菊[1] 史建南[1] 

机构地区：[1]成都理工大学,成都610059

出　　处：《科学技术与工程》2013年第29期8585-8589,共5页Science Technology and Engineering

基　　金：中国地质调查项目(1212011220757);国家自然科学基金项目(41172120)资助

摘　　要：成藏年代学是成藏动力学领域研究的重点和难点,是揭示油气成藏过程、成藏机理的重要途径。通过烃源岩生排烃期分析、自生伊利石K-Ar同位素年龄测定及流体包裹体均一温度等方法定量地研究了鄂尔多斯盆地姬塬油田延长组长6油层组油气藏的充注历史。综合分析认为,长7段和长6段有效烃源岩自晚侏罗世晚期-早白垩世早期进入生排烃门限以来,长6油层组主要存在160 Ma～140 Ma和110 Ma～90 Ma的两期油气充注过程。其中,早期以连续、缓慢、小规模的低充注为主要特征;晚期则以瞬态、快速、大规模的高充注特征为主,是长6油层组的主要充注时期。Geochronology analysis of hydrocarbon accumulation is regarded as not only the focal point and difficult point to accumulation dynamic but also the effective measure to reveal accumulation processes and accumulation mechanism.The charging history of Chang6 member has been studied quantificationally by analyzing hydrocarbon generation and expulsion period of source rocks,researching K-Ar isotopic dating and examining homogenization temperatures of fluid inclusions in Jiyuan oilfield of Ordos basin.According to the research results,Chang6 member mainly has two-stage charging processes in 160 Ma ～ 140 Ma and 110 Ma ～90 Ma,since the effective source rocks of Chang7 and Chang6 members came into the threshold of hydrocarbon generation and expulsion from late Jurassic to early Cretaceous.Moreover,the early low charging takes on consecutive and slow characteristics in miniature,moreover,the late central charging takes on instantaneous and rapid characteristics cosmically.

关 键 词：鄂尔多斯盆地 延长组 生排烃期 K-Ar定年 流体包裹体 

分 类 号：TE122.31[石油与天然气工程—油气勘探]