陕北志丹南部马五段上部碳酸盐岩储层特征与测井解释

发布时间：2018-06-14 12:43

本文选题：志丹南部 + 马五段　；参考：《西安石油大学》2015年硕士论文

【摘要】：本文的研究区域为鄂尔多斯盆地陕北志丹南部地区,研究层位为奥陶系马五4?马六段地层。本文在岩石描述、薄片鉴定的基础上,利用孔渗、压汞和碳氧稳定同位素等分析数据对本E碳酸盐岩储层的岩性、物性特征、孔隙类型、结构特征以及成岩作用等方面进行了研究。结果表明,研究区马五W亚段岩石类型主要为泥粉晶白云岩、溶蚀角砾状白云岩、砂砾屑白云岩、亮晶鲕粒白云岩等,马六段主要为泥晶灰岩。储层物性差,属特低孔、特低渗储层。储集空间以次生孔隙为主,包括晶间孔、晶间溶孔、膏模孔、盐模孔和微裂缝等。成岩作用复杂多样,主要包括白云化作用、溶蚀作用、压实-压溶作用、重结晶作用和胶结作用等。本文应用密度-中子交会方法识别碳酸盐岩岩性并确定储层的基质孔隙度,同时应用裂缝识别方法解释并确定裂缝类型及裂缝孔隙度,明确了储层的分布特征及规律。储层纵向上主要分布于马五I2小层、马五I3小层、马五22小层和马五小层,其他层位储层发育较差,厚度小,呈片状分布,平面上沿西北-东南方向展布,储层厚度平均4m?以III类储层为主。
[Abstract]:The research area of this paper is the southern area of Zhidan in northern Shaanxi, Ordovician Ma-54? Ma Liu formation. On the basis of rock description and thin slice identification, the lithology, physical properties and pore types of the carbonate reservoir are analyzed by using the data of pore permeability, mercury injection and stable isotope of carbon and oxygen. Structural characteristics and diagenesis were studied. The results show that the main rock types of Mawu submember in the study area are mudstone dolomite, dissolution breccia dolomite, sandy gravel dolomite, bright grain oolitic dolomite, etc. The reservoir physical property is poor, belongs to extremely low porosity, extremely low permeability reservoir. The main reservoir space is secondary pore, including intergranular pore, intergranular solution pore, paste mold pore, salt mold pore and microfracture. The diagenesis is complex and diverse, including dolomitization, dissolution, compact-pressure solution, recrystallization and cementation. In this paper, the density neutron intersection method is used to identify the lithology of carbonate rocks and determine the matrix porosity of the reservoir. At the same time, the fracture type and fracture porosity are interpreted and determined by using the fracture identification method, and the distribution characteristics and rules of the reservoir are clarified. The reservoir is mainly distributed vertically in the Ma Wu I 2, Ma Wu I 3, Ma Wu 22 and Ma 5 layers. The other reservoirs have poor development and small thickness, which are flake distribution, and are distributed along the northwest to southeast direction on the plane. The average reservoir thickness is 4 m? Type III reservoir is the main reservoir.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.81

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