西湖凹陷低渗砂岩气藏可动水饱和度研究

通过对西湖凹陷22块岩心进行核磁共振实验,确定了本区域可动水饱和度的分布规律,并获得了不同低渗岩样气相渗透率与束缚水饱和度关系曲线。西湖凹陷低孔渗储层的物性好,但可动水饱和度高,这是造成本区气藏产能低的主要原因。通过气田实际生产实例,验证了低孔渗气藏产水的可能性,为该类气藏的开发提供指导。

Mobile water saturation in the low permeability sandstone gas reservoir in Xihu sag

Through nuclear magnetic resonance(NMR)of 22 pieces of core experiment in Xihu sag,the distribution of mobile water saturation in this area was determined,and the different curves of low permeability rock gas permeabilityand irreducible water saturation were obtained.Compared with the low porosity and permeability gas reservoirs in Sichuan basin,the low porosity and permeability reservoirs in Xihu sag were better in physical properties,while the movable water saturation was higher,and it was the main reason for low productivity of the gas reservoir in this area.Through the practical production of gas fields,the possibility of producing water in low porosity and permeability gas reservoir was verified and therefore,it provided the guidance for the development of similar gas reservoirs.