Abstract:

Because of the small time difference with the reflected signal, it is difficult to completely remove inter-layer multiples at the near offset. The presence of near offset multiples on the gathers increases the inversion multiplicity. In addition, false reflection by multiples on the stack section also increases the interpretation risk. In this study, an attenuation method of inter-layer multiples based on predictive filtering is proposed. First, the multiples of middle and long offset are attenuated by dip filtering; Second, the gathers containing residual inter-layer multiples are sorted in random order; Third, the residual inter-layer multiples are removed by predictive filtering. Through testing the actual data, our method presented here has good attenuation effect on inter-layer multiples, with short offset and small time difference.

Key words: land seismic data, inter-layer multiple, prediction filter