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通过对华庆地区长63储层进行恒速压汞测试和核磁共振实验测试,研究了不同岩石物性的储层微观孔喉结构特征。结果表明:虽然岩石物性不同,但孔隙半径数值分布区间差异不大,分布范围和峰值基本接近;随着岩石物性变化,喉道半径数值分布区间差异较大,储层渗透率越大,喉道半径数值分布范围越宽,孔喉结构分选性越差。岩石物性变化与孔喉半径比分布特征有关,物性越好,孔喉半径比的峰值越小,孔喉连通性越好,排驱效果越好。可动流体由孔隙和大喉道中流体共同组成,可动流体饱和度受孔隙和喉道的配置关系影响。
The properties of micro-pore-throats of reservoirs with different petrophysical properties were studied through constant-rate mercury intrusion porosimetry and nuclear magnetic resonance test of Chang 63 reservoir in Huaqing area. The results show that although the petrophysical properties are different, the numerical distribution of the pore radius does not differ much, and the distribution range and the peak value are basically close. With the changes of petrophysical properties, the values of throat radii are greatly different and the permeability of reservoirs is larger. The wider the numerical range of radius distribution, the poorer the pore-throat structure sorting. The change of petrophysical properties is related to the pore-throat radius ratio distribution. The better the physical properties, the smaller the peak throat radius ratio, the better the pore-throat connectivity and the better the drainage effect. The moving fluid consists of the pores and the fluid in the throat, and the mobility of the moving fluid is affected by the pore-throat configuration.