鄂尔多斯盆地张天赐油区延安组沉积相特征及砂体叠置关系  

Sedimentary facies characteristics and superposition relationship of sand body of Yan′an Formation in Zhangtianci Oilfield,Ordos Basin

作　　者：马钰凯 肖鄂[1] 李杰[1] 白婷 井康康 Ma Yukai;Xiao E;Li Jie;Bai Ting;Jing Kangkang(Exporation and Development Technology Research Center,Yanchang Oilfield Co.,Ltd.,Yan′an 716000,China)

机构地区：[1]延长油田股份有限公司勘探开发技术研究中心,陕西延安716000

出　　处：《能源与环保》2024年第3期105-114,共10页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：延长油田股份有限公司科技项目(ycsy2022qt-B-1-2-4-9)。

摘　　要：开展小层沉积微相判别及对单砂体的精细刻画是油气藏精细开发的重要内容。基于岩心、薄片及测井等资料,对鄂尔多斯盆地张天赐油区延9油层组的岩石类型、颜色、沉积结构、沉积构造及测井相特征等沉积相标志进行了研究。研究发现,延9储层以灰色、浅灰色岩屑质长石砂岩为主,分选及磨圆均较好。研究认为,延9油层组主要为河流沉积,属网状河亚相,具体可划分为网状河道、河间洼地和决口扇沉积微相;延9油层组砂体的垂向叠置类型可归纳为独立型、叠加型、切叠型,横向叠置类型可归纳为间隔型、搭接型、切割型和取代型。The identification of sedimentary microfacies in small layers and the fine characterization of single sand bodies are important contents of the fine development of oil and gas reservoirs.Based on data such as rock cores,thin sections,and logging,this paper studied the sedimentary facies markers such as rock type and color,sedimentary texture,sedimentary structure and logging facies characteristics of Yan 9 oil-bearing formation in Zhangtianci area,Ordos Basin.It was found that Yan 9 reservoir is mainly composed of gray and light gray lithic arkose,with good sorting and rounding.Research suggests that the Yan 9 oil-bearing formation is mainly composed of river sediments,belonging to the subfacies of network river channels,which can be specifically divided into network river channels,inter river depressions,and crevasse fan sedimentary microfacies.The vertical superposition types of Yan 9 oil-bearing formation sand body in the study area can be summarized as independent type,superposition type and cutting superposition type.The types of transverse stacking can be divided into spacer type,lap type,cutting type and substitution type.

关 键 词：张天赐油区 延安组 沉积微相 砂体叠置关系 延9油层组 

分 类 号：P534[天文地球—古生物学与地层学]