摘要：The actual shale reservoir often contains acertain proportion of gas impurities,includingethane,propane and hydrogen chloride.The seep-age characteristics of methane in nano-fracture willbe affected by the existence of these gas impurities.In this paper,a new model of gas seepage charac-teristics of shale nano-fracture coupled with mixedgas and real gas effect was proposed.In addition,the characterization equation of nano-scale fracturegeometry parameters was improved by the equiva-lent circle area method,which comprehensivelyconsidered the influence of the slippage effect,Knudsen number of crack width,and the mixed gason the real gas transmission process.The resultsshowed that in the full pressure range,the real gaseffect release the influence degree of Knudsen dif-fusion.When the intermolecular force and molecu-lar volume under the real gas effect condition arealso taken into account,Knudsen's diffusion con-tribution rate prediction value increases within thefull pressure range.The methane content in themixed gas decreases,which leads to the increase ofreal gas effect.The contribution rate of mul-ti-component gas to different percolation mecha-nism has a little influence.The research results haveimportant theoretical value and practical signifi-cance for the effective development of shale gas inthe nano-fracture environment.
关键词：Shale gas reservoirs;nano-fracture;stratigraphic envi-ronment;shale gas;rcal gas effect;percolation mecha-nism
