Abstract:Looking for subtle oil/gas reservoir is always the difficult problem in oil/gas exploration.The mid-shallow layers in Jilin oilfield of east China have entered higher mature stage and the early exploration of structural traps was transformed to current exploration of subtle traps for majority of oil/gas exploration.In view of characters of 3D pieces-joint work area in west margin zone of south Songliao basin and Chaheji fault depression of Yitong graben,the paper comprehensively applied such techniques and tools as fine structural interpretation,wave impedance inversion by sonic curve reconstruction,sequence-stratigraphy,analysis of seismic phases and sedimentary (micro)facies,forward modeling,analysis of seismic attributes,spectrum decomposition and 3D visualization.The industrial oil/gas flow or good oil/gas show was obtained from many provided prospecting wells,which achieved good interpretation effects.