Abstract:Generally speaking, the frequency band of wavelets in present oil-gas seismic exploration is less than two octaves; and the wavelets have both long durations and big side-lobe amplitudes. As for thin-bed series, the influence of the durations and side lobes on reflections is nonnegligible. The amplitude of reflection from thin-bed series is a function of lithology,bed number and bed thickness. The relation between the amplitude of thin-bed series reflection and lithology is complicated and varying. The shallow gas reservoir at well Jl5 is a typical example showing this complex relation. The influence of thin-bed-series response should be sufficiently considered so as to avoid the interpretation mistakes caused because of misusing the thick-bed reflection concept in the interpretation of thin-bed-serifs reflections. To ascertain the influence of thin-bed-series response on seimic reflection by making forward and inverse seismic modeling using log data is an effective method for avoiding "seismic pitfall".