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利用高压压汞、恒速压汞、核磁共振等实验,研究分析苏里格苏48区块盒8段储层可动流体饱和度的分布特征及主要控制因素.结果表明,研究区样品T_2谱主要呈左高右低的双峰型及单峰型两种形态,可动流体饱和度与可动流体孔隙度变化幅度较大.根据可动流体饱和度将储层划为3种类型,不同类型储层可动流体饱和度差异较大:Ⅰ类、Ⅱ类储层物性较好,孔隙半径大,喉道较粗,孔喉分布均匀,孔隙连通性好,粘土矿物质量百分数低,可动流体饱和度高;Ⅲ类储层孔隙半径小,孔喉分选差,孔隙之间连通性差,粘土矿物质量百分数高,可动流体饱和度低.可见可动流体饱和度受多种因素综合影响,其中微观孔喉特征是控制可动流体饱和度大小的主要因素,粘土矿物次之,储层物性最弱.孔喉特征参数中,孔隙半径、孔喉半径比、孔喉体积比、分选系数的控制作用最为显著,均值系数以及排驱压力的影响较为明显.在其它孔喉参数相差较小时,喉道对可动流体饱和度的大小起决定性作用;粘土矿物中,高岭石的质量百分数影响最大.
Using high-pressure mercury intrusion, constant pressure mercury intrusion and nuclear magnetic resonance experiments, the distribution characteristics and main controlling factors of mobile fluid saturation in the 8th block of the Sulige Su 48 block were studied.The results show that T_2 Mainly in the form of bimodal and unimodal low left high right and low, the dynamic fluid saturation and the movable fluid porosity have a wide range of variation, and the reservoirs are divided into three types according to the saturation of the movable fluid The types of reservoirs have quite different degrees of dynamic fluid saturation. Class I and II reservoirs have good physical properties, large pore radius, thick throats, uniform distribution of pore throats, good pore connectivity, low clay mineral mass fraction, The fluid saturation is high; the pore radius of Class Ⅲ reservoir is small, the pore throat is poorly sorted, the connectivity between pores is poor, the mass percentage of clay minerals is high, and the saturation of movable fluid is low.It can be seen that the dynamic fluid saturation is affected by many factors , Among which pore and throat characteristics are the main factors to control the saturation of mobile fluid, followed by clay minerals and the lowest reservoir physical properties.Pore radius, pore throat radius ratio, pore throat volume ratio, sorting The most significant coefficient of control, mean coefficient Effects and expulsion pressure more obvious when other parameters differ small pore throat, the throat size of the movable fluid saturation decisive; clay minerals, kaolinite mass percentage of the maximum effect.