安塞油田侯市地区长6油层储层特征

安塞油田侯市地区长６油层属于河流三角洲体系，主要储集砂体为三角洲前缘砂坝复合体和水下分流河道砂体．通过铸体薄片、扫描电镜、Ｘ－射线衍射和电子探针等多项分析测试手段，对储层岩石学和成岩作作进行了详细研究。储层岩石类型主要为细粒长石砂岩，主要成岩矿物为绿泥石、浊沸石、方解石、石英、钾长石、伊利石和钠长石等．在成岩矿物研究基础上，建立了成岩演化模式．储层储集空间以次生孔隙为主，并以次生粒间孔隙占优势，次为骨架颗粒溶孔和浊沸石溶孔，多数样品中存在微裂缝．储层性质受砂体微相和成岩作用的控制，在砂体发育和有效厚度高值区，孔渗性较好．

Reservoir Characteristics of Chang 6 Oil bearing Formation in Houshi Tract,Ansai Oil Field

The depositional system of Chang 6 reservoir in Houshi Tract,Ansai Oilfield is a deltaic complex reworked by wave action.Its main reservoir sandbodies are wave reworked sandbars and distributary channel fills.Reservoir lithology is fine grained arkose.Diagenetic mineral includes chlorite,laumonit,calcite,quartz.k feldspar,illite and albite.Diagenetic evolution mode is established based on the study of diagenetic features.Among reservoir pores,secondary intergranular pore occupies first place,and skeletal grain dissolved pore and laumonite dissolved pore takes second place.The reservoir characteristics are controlled by sedimentary facies and diagenesis.The porosity and the permeability are high in developed sand bodies and in the thicker areas of the reservoir.