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Volume 26 Issue 4
Aug 2015
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Journal of Earth Science  > 2015  >  26(4): 502-507.
Taikun Shi, Jianzhong Zhang, Zhonglai Huang, Changkun Jin. A layer-stripping method for 3D near-surface velocity model building using seismic first-arrival times. Journal of Earth Science, 2015, 26(4): 502-507. doi: 10.1007/s12583-015-0569-0
Citation: Taikun Shi, Jianzhong Zhang, Zhonglai Huang, Changkun Jin. A layer-stripping method for 3D near-surface velocity model building using seismic first-arrival times. Journal of Earth Science, 2015, 26(4): 502-507. doi: 10.1007/s12583-015-0569-0
shu

A layer-stripping method for 3D near-surface velocity model building using seismic first-arrival times

doi: 10.1007/s12583-015-0569-0
  • 1.

    College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China

  • 2.

    Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao, 266100, China

More Information
  • Corresponding author: Jianzhong Zhang, zhangjz@ouc.edu.cn
  • Received Date: 05 Sep 2014
  • Accepted Date: 31 Dec 2014
  • Publish Date: 12 Aug 2015
    Abstract
  • In order to improve the efficiency of 3D near-surface velocity model building, we develop a layer-stripping method using seismic first-arrival times. The velocity model within a Common Mid-Point (CMP) gather is assumed to be stratified into thin layers, and the velocity of each layer varies linearly with depth. The thickness and velocity of the top layer are estimated using minimum-offset first-arrival data in a CMP gather. Then the top layer is stripped and the second layer becomes a new top layer. After removing the effect of the top layer from the former first-arrival data, the new first-arrival data are obtained and then used to estimate the parameters of the second layer. In this manner, the velocity model, being regarded as that at a CMP location, is built layer-by-layer from the top to the bottom. A 3D near-surface velocity model is then formed using the velocity models at all CMP locations. The tests on synthetic and observed seismic data show that the layer-stripping method can be used to build good near-surface velocity models for static correction, and its computation speed is approximately hundred times faster than that of grid tomography.

     

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