Numerical Simulation of the Multi-level Air-Gun Array Based on Over/Under Source

Zhe LI, Haikun WANG

Abstract


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.


Keywords


Air-gun array; Over/under source; Multi-level source; Source ghost; Numerical simulation

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References


Bell, D. W., & Cox, V. D. (1987). Two-trace directional filter for processing offset VSPs. 57th Annual International Meeting, SEG, Expanded Abstracts, 768-769.

Cambois, G., Long, A., Parkes, G., Lundsten, T., Mattsson, A., & Fromyr, E. (2009, June). Multi-level air gun array―a simple and effective way to enhance low frequencies in marine seismic. Paper presented at the 71st AGE Conference and Exhibition, Amsterdam, The Netherlands.

Egan, M., El-Kasseh, K. G., & Moldoveanu, N. (2007). Full deghosting of OBC data with over/under source acquisition. SEG Technical Program Expanded Abstracts, 31-34.

Hopperstad, J., Laws, R., & Kragh, E. (2008, June). Fundamental principles of isotropic marine source design. Paper presented at the 70th EAGE Conference and Exhibition, Rome, Italy.

Keller, J. B., & Kolodner, I. I. (1956). Damping of underwater explosion bubble oscillations. Journal of Applied Physics, 27(10), 1156-1161.

Laws, R. M., Hatton, L., & Haartsen, M. (1990). Computer modeling of clustered air guns. First Break, 8(9), 331-338.

Moldoveanu, N. (2000). Vertical source array in marine seismic exploration. 70th Annual International Meeting, SEG, Expanded Abstracts, 53-56.

Parkes, G. E., Ziolkowski, A., & Hatton, L. et al. (1984). The signature of an air gun array, Computation from near-field measurements including interactions-Practical considerations. Geophysics, 48(2), 105-111.

Safar, M. H. (1976). Efficient design of air-gun arrays. Geophysical Prospecting, 24, 773-787.

Ziolkowski A., Parkes, G., & Hatton L., et al. (1982). The signature of an air gun array, Computation from near-field measurements including interactions. Geophysics, 47(10), 1413-1421.

Ziolkowski, A. (1970). A method for calculating the output pressure waveform from an air gun. Geophysics, 21, 137-161.




DOI: http://dx.doi.org/10.3968%2Fj.est.1923847920130601.2613

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