子北油田高台—毛家河北储层基本特征  

Basic Characteristics of North of Gaotai-Maojiahe Reservoir in Zibei Oilfield

作　　者：冷丹凤[1] 孟旺才 王彩霞[1] 常雪彤 Leng Danfeng;Meng Wangcai;Wang Caixia;Chang Xuetong(Exploration and Development Research Center of Yanchang Oilfield Co., Ltd., Yan'an, Shaanxi 716001, China)

机构地区：[1]延长油田股份有限公司勘探开发研究中心,陕西延安716001

出　　处：《非常规油气》2020年第3期46-54,共9页Unconventional Oil & Gas

摘　　要：为了搞清子北油田高台—毛家河北储层基本特征,充分应用样品化验分析、扫描电镜、铸体薄片、压汞等大量资料,开展了储层岩石学特征、储层孔隙类型、孔喉特征、成岩阶段及储层分类评价等工作。研究结果表明①长2—长6砂岩类型主要为长石砂岩、岩屑长石砂岩,填隙物总体含量均不高(4.5%~24.5%),平均为13.8%,胶结物主要是石英加大、长石加大以及水云母、绿泥石和方解石;②长2—长6主要发育有粒间孔、溶蚀孔隙、微裂隙、晶间孔等孔隙类型,储层孔隙结构大体划分中小孔细喉型、微小孔微喉型、微孔微喉型;③长2—长6储层的成岩作用处于晚成岩阶段A期,粒间溶孔是储层的主要储集空间;④储层可划分为IIIb类、IVa类、IVb类、V类共4类,其中长6储层IIIb类、Ⅳa类储层分布面积较广泛,长4+5储层IIIb类、Ⅳa类储层发育面积较小。以上成果认识对下步勘探开发具有重要指导意义。In order to find out the basic characteristics of north of Gaotai-Maojiahe reservoir in Zibei oilfield,the petrological characteristics,pore types,pore throat characteristics,diagenetic stages and reservoir classification evaluation were carried out by making full use of a large number of data such as sample analysis,scanning electron microscopy,casting thin sections,mercury injection,etc.The results show that:①Chang-2-Chang-6 sandstones are mainly feldspathic sandstones and lithic feldspar sandstones,and the total content of fillings is not high(4.5%~24.5%),with an average of 13.8%.The cements are mainly quartz enlargement,feldspar enlargement and hydromica,chlorite and calcite.②The pore types of Chang-2-Chang-6 mainly include intergranular pore,dissolution pore,micro fracture and intercrystalline pore.The pore structure of reservoir can be divided into medium-small pore and micro throat,micro pore and miniature throat and micro pore and micro throat.③The diagenesis of Chang-2-Chang-6 reservoir is in the late diagenesis stage A,intergranular dissolution is the main reservoir space.④The reservoir can be divided into four types:IIIb,IVa,IVb and V.The distribution area of the reservoirs of IIIb and IVa in Chang-6 reservoir is wide,and the development area of IIIb and IVa in Chang-4+5 reservoir is small.The above results are of great significance to the next exploration and development.

关 键 词：子北油田 岩石学特征 储层孔隙特征 成岩作用 储层评价 

分 类 号：TE132[石油与天然气工程—油气勘探]