鄂尔多斯盆地南212井区长6_(2)致密砂岩储层特征及其影响因素  

Characteristics of Chang 6_(2)Tight Sandstone Reservoir in Nan 212 Well Block of Ordos Basin and Its Influencing Factors

作　　者：张俊杰 郭艳琴 吴珍珍 相金元 李百强 赵灵生 王琦 樊平天[6] 李平[6] ZHANG Junjie;GUO Yanqin;WU Zhenzhen;XIANG Jinyuan;LI Baiqiang;ZHAO Lingsheng;WANG Qi;FAN Pingtian;LI Ping(Key Laboratory of Shaanxi Province for Petroleum Accumulation Geology,College of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an,Shaanxi 710065,China;Engineering and Technology Branch,CNPC Xibu Drilling Engineering Company Limited,Wulumuqi,Xinjiang 830011,China;School of Resources and Environmental Engineering,Hefei University of Technology,Hefei,Anhui 230009,China;Key Laboratory of Hubei Province for Petroleum Geochemistry and Environment,Yangtze University,Wuhan,Hubei 430100,China;Sulige Gas Field Branch,PetroChina Greatwall Drilling Company Limited,Panjin,Liaoning 124010,China;Nanniwan Oil Production Plant,Yanchang Oil Field Company Limited,Yan’an,Shaanxi 716000,China)

机构地区：[1]西安石油大学地球科学与工程学院/陕西省油气成藏地质学重点实验室,陕西西安710065 [2]中国石油集团西部钻探工程有限公司工程技术处,新疆乌鲁木齐830011 [3]合肥工业大学资源与环境工程学院,安徽合肥230009 [4]油气地球化学与环境湖北省重点实验室(长江大学资源与环境学院),湖北武汉430100 [5]中国石油长城钻探工程有限公司苏里格气田分公司,辽宁盘锦124010 [6]延长油田股份有限公司南泥湾采油厂,陕西延安716000

出　　处：《西安石油大学学报（自然科学版）》2023年第3期10-18,26,共10页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金青年项目(41502107);陕西省自然科学基础研究计划资助项目(2017JQ4018);陕西省重点研发计划一般项目(2023-YBGY-079);陕西省技术创新引导专项基金(2023-YD-CGZH-02)。

摘　　要：为了明晰鄂尔多斯盆地南212井区延长组长62致密砂岩储层特征及其影响因素,综合铸体薄片鉴定、扫描电镜观察、高压压汞、核磁共振、X-衍射等分析测试资料,对储层岩石学、物性、孔隙结构特征、成岩作用及储层物性的控制因素进行研究。研究表明:研究区长6_(2)储层主要为长石砂岩和少量岩屑长石砂岩,为低孔—特低孔、特低渗储层,孔隙类型以粒间孔、长石溶孔为主,孔隙组合类型主要为溶蚀孔-粒间孔型,孔隙结构分为大孔-细喉型、中孔-微细喉型以及小孔-微喉型3种类型,中孔-微细喉型最为发育;成岩作用主要为压实压溶作用、胶结作用和溶蚀作用;储层物性受沉积环境与成岩作用的共同影响,在分流河道储层物性好,储层单砂体厚度越大,物性越好;压实压溶作用和胶结作用均对储层物性起破坏性作用,溶蚀作用对储层具有建设性作用。In order to clarify the characteristics of Chang 6_(2)tight sandstone reservoir in Nan 212 well block of Ordos Basin and its influencing factors,the petrology/physical property,pore structure characteristics,diagenesis of the reservoir and controlling factors of physical property of the reservoir were studied based on casting thin section identification,scanning electron microscope observation,high-pressure mercury injection,nuclear magnetic resonance and X-ray diffraction data.The research shows that the Chang 6_(2)reservoir in the study area is mainly composed of feldspar sandstone and a small amount of lithic feldspar sandstone,which is a low-ultra-low porosity and ultra-low permeability reservoir.The pore types are mainly intergranular pores and feldspar solution pores.The pore combination type is mainly dissolution pore-intergranular pore.The pore structure is divided into three types:large pore-fine throat,medium pore-micro fine throat and small pore-micro throat.Among them,the medium pore-micro fine throat is the most developed pore throat type,accounting for 56.25%.Diagenesis mainly includes compaction,cementation and dissolution.The physical property of reservoir is jointly affected by sedimentary environment and diageneses.The reservoir in distributary channel has good physical property.The greater the thickness of single sand body,the better the physical property of reservoir.Both compaction and cementation have destructive effects on the physical property of the reservoir,and the porosity loss rate caused by compaction and cementation is 57.15%and 25.77%,respectively.Dissolution has a constructive effect on the reservoir,with an average increase of 2.96%in porosity and a porosity increase rate of 7.29%.

关 键 词：长6_(2)储层 储层特征 影响因素 南泥湾油田 鄂尔多斯盆地 

分 类 号：TE122.23[石油与天然气工程—油气勘探]