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| Application of shallow seismic reflection surveys in the exploration of urban underground space in Jinan |
XIAO Guan-Hua( ), ZHANG Wei, CHEN Heng-Chun, ZHUO Wu, WANG Yan-Jun, REN Li-Ying |
| Liaohe Geophysical Exploratione Company Branch of BGP CNPC,Panjin 124010,China |
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Abstract Shallow seismic reflection (SSR) surveys are an indispensable method in the exploration of urban underground space.Their exploration effects are affected by many aspects such as excitation,receiving factors,acquisition parameters,and processing methods,which should be systematically scientifically demonstrated and selected according to geological tasks.Taking an underground space exploration project in Jinan as an example,the authors discussed the method of improving the resolution of SSR surveys.Through the comprehensive analysis of the collected data,a reasonable seismic geological model was established.Based on this model,the forward analysis and illumination analysis were performed using the fluctuation equation of seismic data acquisition parameters,obtaining a high-density two-dimensional seismic observation plan.Meanwhile,high-resolution reflection images were obtained through the study on targeted data processing techniques such as pre-stack denoising,deconvolution,and velocity field optimization.Excellent exploration results have been achieved in the project.This study will provide reliable geophysical exploration data for the construction of the smart city in Jinan,and can serve as references for the implementation of SSR exploration in this area in the future.
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Received: 03 August 2020
Published: 25 February 2022
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Shallow geological model map
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F-K spectrum analysis of single gun in forward modeling with different trace distances
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Analysis chart of velocity analysis precision(a) and dynamic correction stretching distortion(b)
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Wave field snapshot analysis of wave equation forward modeling
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Illumination comparison of wave equation with different offset
a—offset 360 m;b—offset 450 m;c—offset 540 m;d—offset 630 m
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Comparison of profile before (a) and after (b) static correction
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General flow chart of denoising
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Comparison of profile before (a) and after (b) denoising
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Processing flowchart of improve resolution
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Comparison of profile before(a) and after(b) velocity field optimization
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Final processing migration profile
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