摘要
对储集空间类型及其演化规律的认识,是评价深部储层储集性和寻找有利勘探靶区的基础。利用岩石薄片、扫描电镜等分析工具,对东营凹陷陡坡带深部储层储集空间类型及成因等储层微观特征进行了分析,结合层序地层格架和凹陷埋藏演化史,研究了储集空间发育的主控因素和演化特征。研究结果表明,东营凹陷陡坡带深部储集空间主要由溶蚀孔隙、残余粒间孔、微孔隙和裂缝组成;由溶孔、残余粒间孔和微孔隙组成的孔隙系统和各类裂缝组成的裂缝系统交织在一起,在裂缝发育区构成了以基质孔隙为节点,以裂缝为支架的节点型网络系统,在孔隙发育区形成了以溶孔为主体,由残余粒间孔连通并且延伸进入各类微孔的储集空间组合。研究区深部储集空间经历了早期粘土矿物衬边和方解石胶结、埋藏早期快速压实、高岭石充填、石膏脱水转化为硬石膏、盐膏层塑性流动、烃类侵入和破裂—充填等多个演化阶段。沉积构造活动、成岩作用和异常高压是控制研究区深部储层发育的主要因素。
The knowledge of reservoir space types and their evolution rule are the foundation of evaluating the property of deep reservoirs and searching favorable exploration targets.Utilizing rock slices,scanning electron microscope and other methods,the microcos-mic reservoir characteristics as space types and genesis of the deep reservoirs was analyzed in the steep slope zone of Dongying Depression.According to the sequence stratigraphy framework and burial evolution history of the depression,main control factors and evolutionary characteristics of the reservoir space were researched.The result indicates that the deep-buried reservoir space is composed of dissolution pore,residual interparticle pore,micropore and fracture.Pore system including former three and crack system of all cracks mingle together.In the fracture-developing areas,they are node-type network system with matrix pores as node points and cracks as base frame.In the pore-developing areas,the reservoir space combination connected by residual interparticle pores and entered in all types of micropore with dominant dissolution pores formed.The deep-buried reservoir space developed in several stages,including early clay cover,calcite cementation,quick compaction at early burial stages,kaolinite filling,gypsum dehydrate to anhydrite,plastic flow in salt-gypsum layer,hydrocarbon invasion and cracking-filling.Sedimentation,tectonic movement,diagenesis and abnormal pressure are the primary factors that control the development of deep-buried reservoirs.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2008年第5期8-12,共5页
Petroleum Geology and Recovery Efficiency
基金
中国石化重点科技攻关项目"断陷湖盆碎屑岩成岩演化与评价"(YKK0602)
关键词
陡坡带
深部储层
储集空间
成岩作用
东营凹陷
steep slope zone
deep-buried reservoir
reservoir space
diagenesis
Dongying Depression
