基于压汞和相渗实验确定束缚水饱和度

ETERMINATION OF THE BOUND WATER SATURATION BASED ON THE MERCURY PENETRATION AND PHASE PERMEABILITY EXPERIMENTS

储集层的束缚水是流体-岩石之间综合特性的反映,储集层的束缚水含量与岩石的孔隙结构及岩石比表面有着十分密切的关系,通过孔渗与束缚水饱和度的关系可以建立束缚水饱和度模型。对每块岩样压汞实验结果根据排驱压力进行插值,按压力平均再与相渗实验对比求取最小误差时的排驱压力值。以此压力下的束缚水饱和度和孔隙度及渗透率建立关系式。通过现场资料解释成果对比分析,表明该方法计算的束缚水水饱和度是合理可信的。

Bound water in the reservoir is a reflection of the comprehensive characteristics between fluids and rocks.Its content has a close relationship with the pore texture and specific surface of rocks.A bound water saturation model can be established through the relationship between porosity-permeability and bound water saturation.According to the replacement pressure,the mercury penetration experimental result to each rock sample should be interpolated.Then the replacement pressure value of least error can be got from contrast with the phase permeability experiment on average pressure.The relational expression is established with the bound water saturation and porosity and permeability under this pressure.Field processing results show that the bound water saturation calculated by this method is reasonable and reliable.