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Numerical simulation for accuracy of velocity analysis in small-scale high-resolution marine multichannel seismic technology

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Abstract

When used with large energy sparkers, marine multichannel small-scale high-resolution seismic detection technology has a high resolution, high-detection precision, a wide applicable range, and is very flexible. Positive results have been achieved in submarine geological research, particularly in the investigation of marine gas hydrates. However, the amount of traveltime difference information is reduced for the velocity analysis under conditions of a shorter spread length, thus leading to poorer focusing of the velocity spectrum energy group and a lower accuracy of the velocity analysis. It is thus currently debatable whether the velocity analysis accuracy of short-arrangement multichannel seismic detection technology is able to meet the requirements of practical application in natural gas hydrate exploration. Therefore, in this study the bottom boundary of gas hydrates (Bottom Simulating Reflector, BSR) is used to conduct numerical simulation to discuss the accuracy of the velocity analysis related to such technology. Results show that a higher dominant frequency and smaller sampling interval are not only able to improve the seismic resolution, but they also compensate for the defects of the short-arrangement, thereby improving the accuracy of the velocity analysis. In conclusion, the accuracy of the velocity analysis in this small-scale, high-resolution, multi-channel seismic detection technology meets the requirements of natural gas hydrate exploration.

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Acknowledgements

This study is financially supported by the National Scientific Foundation of China (Grant no. 41506085), the Open Foundation of the Key Laboratory of Gas Hydrate, Ministry of Land and Resources, China (Grant no. SHW [2014]-DX-12), and the China Geological Survey Project (Grant no. DD20160213).

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Authors and Affiliations

  1. The Key Laboratory of Gas Hydrate, Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao, 266071, P. R. China

    Di Luo, Feng Cai & Zhiqiang Wu

  2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, P. R. China

    Di Luo, Feng Cai & Zhiqiang Wu

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  1. Di Luo
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  2. Feng Cai
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  3. Zhiqiang Wu
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Correspondence to Feng Cai.

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Luo, D., Cai, F. & Wu, Z. Numerical simulation for accuracy of velocity analysis in small-scale high-resolution marine multichannel seismic technology. J. Ocean Univ. China 16, 370–382 (2017). https://doi.org/10.1007/s11802-017-3145-7

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  • DOI: https://doi.org/10.1007/s11802-017-3145-7

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