合水地区长7段致密油储层孔隙结构特征及分类  

Pore structure characteristics and classification of Chang 7 tight oil reservoir in Heshui area

作　　者：王汉青[1] 刘阳[2] 魏波[1] 折文旭 杨若姣 

机构地区：[1]西安石油大学石油工程学院,陕西西安710065 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石油新疆油田分公司风城油田作业区,新疆克拉玛依834000

出　　处：《油气藏评价与开发》2015年第4期6-11,共6页Petroleum Reservoir Evaluation and Development

摘　　要：鄂尔多斯盆地合水地区长7段储层为典型的致密油储层,而致密油储层孔隙结构特征的表征及分类评价是储层研究的重点。运用铸体薄片、扫描电镜、高压压汞等方法,对其孔隙结构特征进行分析研究,并通过分析孔喉结构参数与宏观物性相关关系,提出以"分选排驱压力"作为孔隙结构分类标准,用数据构形理论确定其分类下限。结果表明:长7储层孔隙类型以长石溶孔为主,其次是残余粒间孔,喉道以窄片状和管束状为主,小孔—微喉和微细喉道,"高孔低渗"为其主要特征;以"分选排驱压力"为标准,将孔隙结构分为Ⅰ型、Ⅱ型和Ⅲ型三类,不同孔隙结构代表不同储层类型;三类储层类型对应三种储层物性,其中Ⅰ型储层物性最好,应作为开发的重点对象。Chang 7 member is a typical tight oil reservoir of Heshui area in Ordos Basin. Pore structure characteristics and classifi？cation evaluation is the key point of reservoir study. Using the methods of casting thin section, scanning electron microscope （SEM） and high pressure mercury injection, pore structure characteristics were analyzed. By analyzing correlation of pore throat structural parameters and macroscopic properties, sorting expulsion pressure was regarded as classification criteria of pore structure. The low？er limit classification of pore structure was determined based on data configuration theory. Results show that Chang 7 reservoir is mainly feldspar dissolved pore, followed by residual intergranular pore. Throat is mainly narrow flaky and control shape throat, fol？lowed by small pore-microthroat and high pore and low permeability. According to sorting displacement pressure, pore structure is divided into typeⅠ, typeⅡ and typeⅢ, and different pore structures represent different reservoir types. Three types of reservoir types correspond to three kinds of reservoir physical properties. Since typeⅠhas the best reservoir physical property, it should be the key development object.

关 键 词：致密油 孔隙结构 分类评价 长7储层 合水地区 

分 类 号：TE122.23[石油与天然气工程—油气勘探]