论文部分内容阅读
通过压汞和渗流实验对鄂尔多斯盆地长6特低渗透储层岩心进行了孔喉结构和渗流实验研究。压汞实验表明,研究区曲线类型总体上属于B类和C类;曲线偏向图的右上方分布,中间过渡段相对较陡,进汞曲线和退汞曲线夹角较小;门槛压力和中值压力高,分选性一般;孔喉半径对渗透率的贡献由单一区域向多区域均有分布;门槛压力、中值压力等与渗透率具有良好的相关关系,但退汞效率和退汞饱和度与渗透率相关性较差。单相渗流实验表明,部分样品在低压力梯度时具有非达西渗流特征,并过渡为达西渗流;两相渗流实验结果表明,储层具有高束缚水饱和度、高残余油饱和度,两相共渗区较窄的特征。
The pore-throat structure and seepage experiment of Chang 6 ultra-low permeability reservoir core in Ordos Basin was conducted by mercury intrusion and seepage experiments. The results of mercury intrusion experiments show that the curve types in the study area belong to categories B and C as a whole. The curve is skewed to the upper right of the figure with the intermediate transitional segment relatively steep and the angle between the mercury intrusion curve and the mercury-ejecting curve smaller. The threshold pressure and median The pressure is high and the selectivity is general; the contribution of pore throat radius to permeability is distributed from single area to multi-area; the threshold pressure, median pressure and so on have a good correlation with permeability, but the efficiency of mercury removal and saturation Correlation of degree and permeability is poor. Single-phase seepage experiments show that some samples have non-Darcy flow characteristics at low pressure gradient and transition to Darcy flow. The experimental results of two-phase seepage show that the reservoirs have high irreducible water saturation and high residual oil saturation. Phase co-infiltration zone narrow features.