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| A technique for building sub-seabed velocity model in shallow sea areas and its application to seismic statics |
| Ling-Yun LI1, Hong-Xian LIANG1, Ning QIN1, Hua-Chen YANG2,3, Jian-Zhong ZHANG2,3 |
1. Geophysical Research Institute of Shengli Oilfield,SIINOPEC,Dongying 257022,China
2. College of Marine Geosciences,Ocean University of China,Qingdao 266100,China
3. Key Lab of Submarine Geosciences and Prospecting Techniques,Qingdao 266100,China |
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Abstract The topographic relief of seabed and the velocity of sub-seabed layers have great influence on imaging quality of OBC data.Estimating sub-seabed velocity models in shallow sea areas can be used not only for static correction of OBC data but also for calculation of such objects as seabed reflection coefficients,merging of OBC dual-geophone seismic data,and multiple suppression.However,there are few velocity model building methods using OBC seismic data in shallow sea areas.In this paper,the authors propose a 3-D sub-seabed velocity model building method using the first arrival times of OBC data in shallow sea areas.The new method includes shot positions correction and fast 3-D velocity inversion method using first arrival times.For the convenience of velocity model inversion,shot points are moved from their original positions to the seabed according to the diving wave ray equation.The fast 3-D velocity inversion method using the diving-wave first arrival times and offset information doesn't need ray tracing.So the new method is faster than the traditional ray tracing inversion methods.The authors applied this method to the field OBC seismic data acquired in shallow sea of the Shengli Oilfield.The static correction of OBC seismic data was performed using the inverted velocity method and the results show that the method is correct and effective.
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Received: 13 July 2018
Published: 10 April 2019
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Schematic diagram of ray path propagation
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Traveltimes and corresponding relative errors
a— theoretical traveltimes (black solid line) and corrected traveltimes (red dashed line);b—relative errors of corrected traveltimes
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Schematic diagram of the observation system
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Shot gathers before (a) and after (b) static correction
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Inverted velocity model
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Velocity slices
a—velocity slice at 3 km in y direction;b—velocity slice at 2 km in x direction
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Stack sections before (a) and after (b) static correction
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