Abstract: Due to the influence of seismic wave resolution, the thin interbedded reservoirs formed by single sand body near the pinch out zone in different periods from II sand group of Shawan formation in Chunguang oilfield cannot be recognized on seismic profile. In order to clarify the tuning effect of internal reflection of thin interbedded reservoirs, four wave impedance models were established and the seismic response characteristics of thin interbedded reservoirs were analyzed. Aiming at the thin interbedded reservoir model of the four sets of sand bodies, the thin interbedded reservoir of the four sets of sand bodies can be identified by frequency division inversion. According to the results of theoretical model study, the application of forward inversion technique in thin interbedded reservoirs of II sand group in Chunguang oilfield has achieved good results, and the high-yielding industrial oil flow has been tested in several wells.