1.College of Earth Sciences, ]ilin University, Changchun 130061, China;
2.Research InstituteofLiaoheOilfield, CNPC, Panjin 124010, Liaoning, China

Based  on  coringand  conventiona11oggingdataof16  we11s, 1avaf1owunitsofPa1eogenebasa1tsin Liaohedepression aredivided intofour1ayersinc1udingmassive1ayer( 中v<1%, 中e<5%) , minorvesicu1ar1ayer (1% <中v<5%, 5% <中e<10%) , mediumvesicu1ar1ayer(5% <中v<10%, 10% <中e<15%) and  high1y vesicu1ar1ayer( 中v>10%, 中e>15%) through  coredescription, thin  section  identification, scanninge1ectron microscope, porosity( 中e) measurementand vesic1eproportion ( 中v) statistics.Itisproposed thatthe1ower1imit ofACin  minorvesicu1ar1ayer(59.7  µs•ft-1 ), 1ower1imitofACin  medium vesicu1ar1ayer(61.5  µs•ft-1 ) and  theupper1imitofACin mediumvesicu1ar1ayer(84.3 µs•ft-1 ) asthe1oggingdivision ofmassive, minorve-sicu1ar, mediumvesicu1arand high1yvesicu1ar1ayer, respective1y.Threetypesofreservoirdistribution patterns and their1oggingresponsesaresummarized inc1udingtabu1ar1avaf1owunit, vesicu1ar-massiveand minor-high1yvesicu- 1arinterbeddingcompound  avaf1owunit.Theeffectiveporositiesofbasa1ticreservoirarecomposed ofresidua1in- fi11ingvesic1es, amygda1oid  disso1ved  porositiesand  microporesinsideamygda1oid  ofc1ayminera1s.On  thewho1e,high-qua1ityreservoirsareprimari1ydeve1oped in theminor-high1yvesicu1arinterbedding1avaf1owunitdueto1arger vesic1eproportion.