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通过物性分析、铸体薄片、X衍射及扫描电镜等测试方法,对北部湾盆地福山凹陷花场—白莲地区流沙港组的岩石学特征、成岩作用和储层物性等影响因素进行分析。结果表明,研究区储层岩石类型以长石质岩屑砂岩和岩屑砂岩为主,孔隙类型以溶蚀孔隙为主,属中孔、低渗透储层;主要成岩作用类型有压实作用、石英次生加大、自生粘土矿物胶结作用和溶蚀作用等,其中压实作用是造成研究区砂岩原生孔隙大量丧失的主要原因,而溶蚀作用产生的次生孔隙则使储层物性得以改善;研究区储层原始孔隙度中等,后期成岩作用改造强烈,目前处于晚成岩阶段A期。通过综合构造、沉积和成岩作用等分析认为,花场—白莲地区流沙港组的有利储层主要为辫状河三角洲前缘相对较高部位的砂体。
The petrological characteristics, diagenesis and reservoir physical properties of the Liushaogang Formation in Huamachang-Bailian area in the Beibuwan Basin are analyzed by means of physical property analysis, cast thin slice, X-ray diffraction and scanning electron microscopy. The results show that the rock types of the reservoirs in the study area are mainly feldspathic lithic sandstone and lithic sandstone. The pore types are dominated by dissolved pores and are medium-porosity and low-permeability reservoirs. The main types of diagenesis are compaction, quartz Secondary compaction and authigenic clay mineral cementation and dissolution, among which the compaction is the main reason for the large loss of primary porosity of sandstone in the study area, while the secondary porosity caused by dissolution can improve the physical properties of the reservoir. The study area The original porosity of the reservoir is medium, and the diagenesis in the later stage is strongly reformed. It is currently in late A diagenetic stage. Through comprehensive analysis of tectonic, sedimentary and diagenetic analyzes, it is considered that the favorable reservoirs of the Liusha-Bailian area are mainly sand bodies with relatively higher parts of the braided river delta front.