Numerical Simulation of the Multi-level Air-Gun Array Based on Over/Under Source
The conventional air-gun array is made of all guns at the same depth. This array is arranged in a simple way. It is easy to operate. But the ghost effect is obvious. And the ghost will limit the effective seismic bandwidth. Using the over/under source, we can attenuate the ghosts generated at the source side. Based on the over/under source, this paper proposes the multi-level source which consists sub-arrays placing at different depths and firing them in a sequence. This makes the notch frequencies of the sub-arrays different. After superposition, it can attenuate the source ghost. The sub-arrays in different depths are regarded as the over/under sources. Then we separate the up-going and down-going events. Data test proved that the algorithm can indeed attenuate the ghost included in the far-field wavelet, which extends the effective bandwidth and benefits low and high frequencies.
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