摘要
利用岩心测井、粒度分析和薄片鉴定等资料综合分析,揭示出研究区长6油层组以三角洲前缘亚相沉积为主,可细分为水下分流河道、河口坝、水下分流间湾、水下决口扇和水下天然堤5个沉积微相,并分析了各小层沉积微相的平面展布规律和沉积微相对储层的控制作用。结果表明,长6油层组的优质储集体主要赋存于水下分流河道砂体及水下分流河道与河口坝组合砂体中,总体上长612、长621和长622期优质储层展布范围较广,平面上连片分布,垂向上相互叠置,是下一步工作的主要目标层位。
Utilizing core logging,grain size analysis and thin section analysis,the authors identified front delta as the major sub-facies type of Chang 6 oil-bearing formation,including the microfacies of subaqueous distributary channel,river mouth bar,subaqueous interdistributary bay,subaqueous crevasse splay,and subaqueous natural levee.The planar distribution regulation of each layer and the control action of sedimentary microfacies to reservoirs have been analyzed,which show that the high quality reservoirs of Chang 6 oil-bearing formation were mainly hosted in subaqueous distributary channel sand and combination sand between subaqueous distributary channel and mouth bar.In general,the high quality reservoirs of Chang 621,Chang 612 and Chang 622 were wider distributed with better continuity in plane and superimposition in vertical,which are the target layers for the next work.
出处
《世界地质》
CAS
CSCD
2010年第4期614-621,639,共9页
World Geology
基金
国家973重大专项(2006CB202304)
关键词
鄂尔多斯盆地
姬塬地区
延长组
长6油层组
沉积微相
Ordos Basin
Jiyuan area
Yanchang Formation
Chang 6 oil-bearing formation
sedimentary microfacies
