Abstract: Based on convolution model, the reflected wave amplitude is the superposition of single reflection coefficient and wavelet convolution. The amplitude of primary seismic reflection seismogram can be regarded as the limited bandwidth reflection coefficient in nature, while the event of seismic profile stands for the interface of wave impedance contrast of layers, which is not consistent with deposition interface. This paper illustrates wave impedance can not completely reflect the lithology of strata by combining with stratigraphic correlation, so it is inaccurate to only use the wave impedance for prediction of lithology. Also, this paper indicates from the model and cases that the pinchout of event does not express the pinchout of reservoir.

Key words: convolution model, reflected wave amplitude, reflection coefficient, reflection event, synthetic seismogram