【作者】 弭连山；

【导师】 操应长；

【作者基本信息】 中国石油大学 ， 矿物学、岩石学、矿床学， 2007， 硕士

【摘要】 东营凹陷南坡沙四段具有良好的隐蔽油藏的形成条件,自65年发现沙四段地层的含油性以来,沙四段不断有新的发现,隐蔽油气藏勘探日益成为重要的研究领域,论文以Vail的经典层序地层学理论为指导,综合应用地震、测井、录井、岩芯及其它分析化验等资料建立了该区的层序地层格架,将研究区沙四上以T7为界划分为2个三级层序,其中沙四上亚段纯上对应于层序1,包括纯上1、纯上2、纯上3、纯上4、纯上5和纯上6六个砂组;沙四上亚段纯下段和纯下下段,对应于层序2,包括纯下1、纯下2砂组和纯下下砂组。通过对工区取心井的岩心观察和描述,以及其他相标志分析,认为沙四上段主要发育河流三角洲-滑塌浊积扇、扇三角洲-湖底扇、滨浅湖滩坝、半深湖-深湖等沉积体系,并建立了相应的沉积相模式。同时,利用岩石特征元素分析、聚类分析、物源指数、岩石成分分析、砂砾岩分布分析等方法研究了该区的物源,认为东营凹陷南斜坡沙四段沉积物来源存在南部和北部两个物源体系,南部物源体系主要发育曲流河-三角洲沉积,沉积物粒度细、成熟度高;北部物源体系主要发育扇三角洲、近岸水下扇-湖底扇沉积体系,沉积物粒度粗、成熟度低。并且从剖面上、平面分析了不同的沉积时期储层的分布规律及演化特征,认为沉积体系的分布受到构造、物源、古地貌、湖平面、基准面、水动力条件及古气候等多种因素的综合控制和影响,其中构造、物源及古地貌是主要的控制因素。更多还原

【Abstract】 There are good formation conditions of subtle reservoir in upper the 4th member of Shahejie Formation of Dongying depression, since of 1965 when reservoir was found ,there are new reservoir discovery , subtle reservoir exploration increasing become important research field. Under the guide of Vail sequence stratigraphic theory, and through the combination of geological data, seismic data, well logging data, drilling cores and other related analyzed data and experimental technique, in upper the 4rh member of Shahejie Formation of Dongying depression, there is established the sequence stratigraphy framework which included 2 third-orde sequences in the limit of T7, sequence 1 which is correspond to ChunShang of upper the 4th member of Shahejie Formation of Dongying depression , include 6 sand groups (Cs6, Cs5, Cs4, Cs3, Cs2, Cs1) from bottom to top of the formation being studied, and sequence 2 which is correspond to Chunxia and Chunxiaxia of upper the 4th member of Shahejie Formation of Dongying depression , include 3 sand groups (Cxx, Cx2, Cx1) from bottom to top of the formation being studied. In comprehensively consideration of the coring , geologging , electriclogging and seismic data, the author sets up the depositional systems of region being studied , such as: river-delta-slumping turbidite fan (deepsea fan)system , beach and dam systerm, beach shallow lake and half deep-deep lake system. It states systematically the depositional systems and their feature .At the same time ,the source of research region have been studied and there were two source systerm(south and north ) . The sand body under the control of the northern source is characteristic of fan delta ,inshore subsea apron and sublacustrine fan; and the sand body under the control of the southern source is characteristic of meandering river delta and slumping turbidite fan .And It analyses the periodicity and cyclicity evolution of depositional model in vertical and plain section , discusses the control factors of depositional system distribution, such as : conformation , source, palaeogeomorphology, variation of lake level,variation of base-level , dynamic condition, palaeoclimate ,and so on . The conformation, source and palaeogeomorphology are more important than the others in research region. These all can taken as a basis for prospecting and study of the next step in this region.更多还原