鄂尔多斯盆地中东部地区奥陶系膏岩下储层特征研究

发布时间：2018-02-04 04:10

本文关键词： 鄂尔多斯盆地储层特征成岩作用储集物性　出处：《长江大学》2017年硕士论文　论文类型：学位论文

【摘要】：鄂尔多斯盆地地处华北地台的西部,北起阴山、大青山,南抵秦岭,西至贺兰山、六盘山,东达吕梁山、太行山,面积约32×104km2,是我国第二大盆地。鄂尔多斯盆地构造体系复杂,沉积地层类型多样,以升降构造运动为主,构造面貌整体呈南北走向,地势西陡东缓。前人通过对盆地构造演化和地质特征研究,将其划分为伊盟隆起、渭北隆起、晋西挠褶带、陕北斜坡、天环坳陷和西缘逆冲带六个构造单元。研究区下古生界奥陶系盐岩沉积地层较为发育,盐岩地层厚度较大且分布面积较广,渗流能力较好,具有优良的储集性能和优良的源储配置关系,能够形成规模较大的天然气工业聚集。长庆油田经过多年勘探研究,提出了“上古生界煤系烃源岩侧向供烃、白云岩岩性圈闭成藏、区域岩性相变带多层系富集”的新理论,并且以此理论为指导成功开采多口高产工业气井。尽管该地区已有多口探井获得工业气流,具有较好的勘探前景,但目前对于该地区的白云岩储层的发育特征、分布规律及主控因素缺乏整体而深入的认识,亟需对其进行有针对性的研究,为盆地中东部奥陶系膏盐下天然气勘探开发提供理论依据和指导方针。在对研究区内四十多口探井及开发井的研究基础上,利用大量的测井资料并结合标志层的识别,对研究区马五10-马五6亚段的各小层进行了详细的划分与对比;根据岩心、岩石薄片、测井资料研究及单井、联井分析表明,研究区发育潮坪相和p 湖相,其中潮坪相发育潮上带、潮间带、潮下带3种亚相和云坪、含膏云坪、膏质云坪、含灰云坪、灰质云坪、颗粒滩、灰坪7种微相,p 湖相发育咸化p 湖亚相和膏盐洼地微相。通过钻井岩心及岩石薄片的观察分析,认为研究区发育泥晶白云岩、含膏泥晶白云岩、粉晶白云岩、含生屑粉晶白云岩、灰质粉晶白云岩、粉-细晶白云岩、细晶白云岩、含生屑细晶白云岩、含膏细晶白云岩、颗粒白云岩及膏质云岩,其中以粉晶白云岩和细晶白云岩的储集物性较好。储层成岩作用研究表明,影响研究区马五10-马五6储层的主要成岩作用有准同生白云石化作用、渗透回流白云石化作用、溶蚀作用、充填作用、重结晶作用、压实作用和压溶作用等。其中准同生白云石化作用、渗透回流白云石化作用和溶蚀作用为建设性成岩作用,充填作用、重结晶作用、压实作用和压溶作用为破坏性成岩作用。根据铸体薄片、扫描电镜、电子探针和激光共聚焦显微镜等资料研究分析,研究区马五10-马五6亚段储层主要发育粒间孔、晶间孔、晶间溶孔、膏模孔、溶孔、微裂缝和晶内孔7类孔隙。储集空间多以各类孔隙的复合形式组成,且以晶间孔为主。渗透率的变化主要受孔隙发育程度的控制,且与孔喉大小、孔喉之间连通性相关。其中马五7、马五9储层物性较好,马五6、马五8、马五10储层物性较差,且储层物性好坏明显受不同岩性和相带的影响。根据储层岩石类型、沉积相、成岩作用、物性参数、孔隙特征、储层厚度等综合指标,建立储层综合评价标准,将研究区储层分为Ⅰ类储层、Ⅱ类储层和Ⅲ类储层。其中在马五7优选Ⅰ类有利储层4个,Ⅱ类储层4个,Ⅲ类储层位于乌审旗-靖边-志丹-榆林一带;在马五9优选Ⅰ类有利储层1个,Ⅱ类有利储层6个,Ⅲ类有利储层位于乌审旗-靖边-志丹-榆林一带。
[Abstract]:The Ordos basin is located in the western part of the North China platform . It is located in the north , the Yinshan , the Daqingshan , the south , the Qinling Mountains , the west to the Helan Mountains , the six Panshan , the east reaches Luliang Mountain , the Taihang Mountains , the area is about 32 脳 104km2 , which is the second largest basin in China . Based on the observation and analysis of drilling core and rock sheet , it is believed that the main diagenesis of Ma Wu10 - Ma Wu6 reservoir in the study area is of good physical properties , such as fine crystal dolomite , dolostone , powder - fine crystal dolomite , fine crystal dolomite , fine crystal dolomite , powder - fine crystal dolomite , fine crystal dolomite , fine crystal dolomite , powder - fine crystal dolomite , fine crystal dolomite , fine crystal dolomite , powder - fine crystal dolomite , fine crystal dolomite , fine crystal dolomite , powder - fine crystal dolomite , fine crystal dolomite , fine crystal dolomite , powder - fine crystal dolomite , fine crystal dolomite , fine crystal dolomite , powder - fine crystal dolomite , fine crystal dolomite , fine crystal dolomite , powder - fine crystal dolomite , fine crystal dolomite , fine crystal dolomite , powder - fine crystal dolomite , fine crystal dolomite , fine crystal dolomite , powder - fine crystal dolomite , fine crystal dolomite , fine crystal dolomite , powder - fine crystal dolomite , fine crystal dolomite , fine crystal dolomite , fine crystal dolomite , fine crystal dolomite , fine crystal dolomite and fine crystal dolomite . The reservoir diagenesis is obviously affected by different lithology and facies belt . Based on the comprehensive indexes such as physical property parameters , pore characteristics , reservoir thickness and so on , a comprehensive evaluation criterion of reservoir is established , and the study area reservoirs are divided into Class I reservoirs , Class II reservoirs and Class III reservoirs .

【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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