吴起地区延9油层组沉积相特征  

Sedimentary Facies Characteristics of Yan9 Oil-Bearing Formation in Wuqi Area

作　　者：仲米剑 石雪峰 逄建东 ZHONG Mi-jian;SHI Xue-feng;PANG Jian-dong(CNOOC Ener Tech-Drilling&Production Co.,Ltd.,Tianjin 300457,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452

出　　处：《辽宁化工》2022年第4期540-542,共3页Liaoning Chemical Industry

基　　金：中海油能源发展股份有限公司科研项目(项目编号:HFKJ-GJ2020-02)。

摘　　要：为弄清吴起地区侏罗系延安组沉积特征,初步寻找该地区有利勘探区域,以岩心观察为基础,通过测井相分析,从单井、连井及平面相等方面系统开展了吴起地区延9油层组沉积相及砂体展布特征研究,结果表明吴起地区侏罗系延9油层组主要为三角洲平原分流河道沉积,河道规模较小,发育分流间湾沉积。储层砂体的分布受沉积相带控制,垂向上延9油层组储层砂体较薄,单层砂体厚度主要在1.5~15 m之间,累计储层砂体厚度在6~40 m之间;砂体沿河道方向及横切河流方向连通性均较差。局部河道中心富砂区可为有利勘探区选择提供参考。To reveal the sedimentary characteristics of Yan’an formation in Jurassic for prospecting further favorable area,on the basis of core observation and through logging facies analysis,a systematic study on the sedimentary facies and sand body distribution characteristics of Yan 9 oil layer group in Wuqi area was carried out from the aspects of individual well profile,cross-well profile and flat distribution respectively.The study shows that the sedimentary of Yan9 oil-bearing formation is in distributary channel deposition of delta plain,with the development of inter-distributary bay facies,and the scale of channel is small.The distribution of sandstone reservoir is controlled by facies,and the sand body of Yan9 oil-bearing formation is thin,the thickness of single reservoir is 1.5~15 m,and the accumulative thickness can reach 6~40 m.The connection of sand body along the channel and in cross section is poor.The sand-rich area in the local channel center can provide a reference for the selection of favorable exploration areas.

关 键 词：鄂尔多斯盆地 吴起地区 沉积相 砂体展布 

分 类 号：TE211[石油与天然气工程—油气井工程]