川中地区大安寨段碳酸盐岩储层特征研究

Characteristics of Carbonate Reservoir in Daanzhai Member of Central Sichuan Basin

从岩心观察、岩石薄片鉴定、X射线衍射结果、孔渗关系入手,研究川中地区大安寨段碳酸盐岩储层的岩石学特征以及物性特征。利用场发射扫描电镜进一步观察大安寨段碳酸盐岩储层储集空间类型,将纳米级储集空间划分开来,再通过毛管曲线、核磁孔径、氮气吸附研究其孔隙结构特征。川中地区大安寨段碳酸盐岩储层物性条件较差,孔隙度、渗透率低,储集空间类型多样,孔喉结构复杂,微孔和纳米孔隙对油气的储集和渗流有重要贡献。

Based on core observation,thin section identification,X-ray diffraction results and porosity permeability relationship,the petrological and physical characteristics of the carbonate reservoir in Daanzhai member of central Sichuan are studied.Field emission scanning electron microscope was used to observe the types of carbonate reservoir space in Daanzhai member,and the nano scale reservoir space was divided.The pore structure characteristics were studied by capillary curve,nuclear magnetic pore size and nitrogen adsorption.The carbonate reservoir of Daanzhai member in Central Sichuan Basin has poor physical properties,low porosity and permeability,various reservoir space types and complex pore throat structure.Micropores and nanopores have important contributions to oil and gas reservoir and seepage.