导　　师： 陈世加

学科专业： 0709

授予学位： 硕士

作　　者： ;

机构地区： 西南石油大学

摘　　要： 鄂尔多斯盆地长7地层以往都被当做生油层,近些年随着勘探力度的加大和技术的提高,合水地区长7获多口井高产工业油流,其储层渗透率普遍小于0.3mD,属于典型.的致密油,因此加强该区储层特征的研究显得尤为重要。本文以石油地质学、储层地质学、油矿地质学和测井地质学等理论和方法为指导,在岩心观察描述基础上,结合测井资料,明确该区不同层段砂体展布特征；运用铸体薄片、扫描电镜、高压压汞等先进的技术和测试手段,系统分析了研究区长7储层物性特征、成岩作用、储层控制因素以及储层物性与含油性关系等,并取得了以下认识。 沉积微相控制研究区砂体发育的规模,顺物源方向砂体较厚,连通性较好。垂直物源方向虽发育较厚砂体,但连通性较差。 研究区岩性以岩屑长石砂岩和长石岩屑砂岩为主,颗粒偏细,以细砂岩为主,分选中等,磨圆以次棱角状为主。成岩作用主要发生在晚成岩阶段A期,主要的成岩类型有：压实作用、溶蚀作用、碳酸盐胶结作用、绿泥石胶结作用和伊利石胶结作用。孔隙类型以粒间孔、溶孔为主,喉道偏细,喉道分布特征对储层渗透率具有重要影响。储层物性整体偏差,长71储层物性略好于长72。 研究区成岩作用强烈,压实、压溶作用和黏土矿物胶结作用使储层变得更为致密,大大降低储层的物性；但颗粒表面绿泥石膜增加颗粒的抗压实能力,对原始储层保护具有重要作用；溶蚀作用和构造微裂缝对改善储层储集空间和渗流能力具有重要意义。因此填隙物的含量、石英含量、分选性、溶蚀作用和裂缝的发育程度对局部相对高孔高渗储层的形成具有重要的控制作用。 储层物性不仅对储层含油性具有重要影响,同时与产能也具有较好的相关性,并且具有物性越好,产能越高的特征,因此储层物性对油气富集具有重要� The chang7formation of Ordos basin was regarded as source rock previously; with the increase of exploration and improvement of technology in recent years, a variety of industrial oil wells are found in chang7formation of Heshui area, and the reservoir permeability are generally less than0.3mD, which belong to typical tight oil. Therefore, it is very important to strengthen the study of reservoir characteristics in the area.Taking the petroleum geology, reservoir geology, ore geology, logging geology and other advanced theories and methods as the guidance, on the basis of core observation description, combining with the logging data, the thesis research the distribution characteristics of different sand body; by using casting thin sections, scanning electron microscope, mercury injection and other advanced testing means, the thesis analyze systematically reservoir property characteristics, diagenesis, main control factors and the relation between reservoir property and oil-bearing in the chang7formation of study area, and obtain the following conclusions. The scale of sand body is controlled by sedimentary microfacies, along the provenance the sand body is relatively thick and the connectivity is better; at the vertical provenance direction the sand body is relatively thin and the connectivity is poor. The lithology in study area is mainly feldspar lithic sandstone and lithic feldspar sandstone, the clastic particle size is smaller and sorting is medium, and roundness is mainly subangular. The chang7reservoir property is relatively poor on the whole, which have characteristics of chang71reservoir property is best, chang72is better, chang73is worst. The pore types are mainly intergranular pore, dissolved pore and micropore, the throat is relatively small, the distribution characteristics of throat have an important impact on reservoir permeability.Thediagenesis in study area are mainly occurred in the late diagenetic stage A, the types of diagenesis are mainly compaction, dissolution, illite cementation, carb

关 键 词： 鄂尔多斯盆地 合水地区 储层特征 成岩作用 储层控制因素

领　　域： [天文地球] [天文地球]