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为了刻画研究区致密浊积砂体储层孔隙、喉道的连通关系及其开发渗流特征,在区域背景研究基础上阐述了储层的宏观特征;并运用铸体薄片、粒度、扫描电镜等分析测试,从微观角度研究了致密浊积砂体储层的孔隙、喉道及其连通关系;最后结合核磁共振、恒速压汞资料、试采资料分析了不同类别储层的渗流及开发特征。研究表明:区内岩石颗粒偏细,分选差成岩作用强是储层致密的基本因素;同时发育不同规模的裂缝。储层整体上以溶蚀孔隙及点状-片状喉道二类储层为主,平均孔喉比中等,流动可动饱和度偏低,渗流能力一般。致密储层在开发初期产量递减大,半年后单井产能一般在0.2 t/d。
In order to characterize the connectivity of the pores and throats of the dense turbid sand bodies in the study area and the characteristics of their developed seepage features, the macroscopic characteristics of the reservoirs are expatiated on the basis of the regional background studies. By means of the analysis of cast thin sections, particle size and scanning electron microscope The pore and throat of thickened turbid sandstone reservoirs and their connectivity were studied from the microscopic point of view. Finally, the seepage and development characteristics of different types of reservoirs were analyzed with NMR, constant pressure mercury injection data and test mining data. The results show that the rock particles in the area are too thin and the poor diagenesis is the basic factor of reservoir densification. At the same time, the fractures of different scales are developed. As a whole, the reservoirs are dominated by dissolved pores and point-like sheet-like throat reservoirs, and the average pore-to-throat ratio is moderate. The mobile saturation is low and the seepage capacity is normal. The production of tight reservoirs diminishes in the initial stage of development. After six months, the productivity of single well is generally 0.2 t / d.