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.