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储层的微观孔隙结构不仅决定着油气的运移、聚集,而且影响着油水分布、油气采收率。通过物性分析、扫描电镜、铸体薄片、高压压汞等技术对长8储层微观孔隙结构特征进行分析研究,结果表明孔隙类型主要有剩余粒间孔、粒间溶孔、粒内溶孔、晶间孔,其中以前2种为主要有效孔隙。孔喉组合以小孔微喉为主,小孔微细喉型次之。根据毛细管压力曲线形态特征,结合排驱压力、孔喉分选性、进汞饱和度、中值压力等参数,将研究区储层分为三类。
The micro-pore structure of the reservoir not only determines the migration and accumulation of oil and gas, but also affects the oil-water distribution and oil and gas recovery. The microscopic pore structure of Chang 8 reservoir was analyzed by physical property analysis, scanning electron microscopy, cast thin slice and high pressure mercury injection. The results showed that the pore types mainly include residual intergranular pores, intergranular dissolved pores, intragranular dissolved pores, Intergranular pores, of which the former two kinds as the main effective pores. Pore throat combination of small throat throat-based microporous throat followed. Based on the morphological characteristics of capillary pressure curves, the reservoirs in the study area are divided into three types based on the parameters of drainage pressure, pore throat separation, mercury saturation, and median pressure.