Abstract: Combining with severial experience stutistical methods,the hyd1ocarbon reservoir types in Yanqi basin arecomprehensively discriminated on the basis of PVTphase behaviour analysis of 7 hydrocarbon samples pickedfrom 5 zones in Well Yanchan l,We1l Bao l and WellYan 2.The IV Zone in Baozhong block in Baolang oilfieldis either a condensate gas reservoir with oil rings or an oilreservoir with a condensate gas cap, whi1e Baobei blockand Yan 2 block in Benbutu oi1field are 1ight b1ack oilreservoirs with rich intermediate hydrotarbons.These studyresultS point out the direction for further exp1oring oilring reserves and provide an important basis fordevelopment planning.