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| A technology applied to shallow high-precision seismic detection in coastal tidal flats |
Hang-Yu YUE1,2, Bao-Wei ZHANG1,2( ), Kai WANG1,2,3, Jin-Li LI1,2, Guang-Ke WANG1,2, De-Yuan CHEN1,2 |
1. Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,China
2. National Center for Geological Exploration Technology,Langfang 065000,China
3. College of GeoExploration Science and Technology,Jilin University,Changchun 130026,China |
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Abstract Due to the restriction of geological detection equipment and tidal time,the degree of geological exploration in coastal tidal-flat areas is low and the detection accuracy is insufficient,which cannot meet the demand of high-precision geological survey in this area.Conventional shallow seismic exploration technology can effectively detect Quaternary bottom interface and internal horizons in the coastal tidal flats,but it has a complex and inefficient data-acquisition equipment,which directly restricts the progress of seismic exploration in this area.Therefore,this paper proposes a high-precision shallow seismic detection technology which is suitable for coastal tidal-flat areas.It can effectively solve the above difficulties by making full use of the surface characteristics in coastal tidal flats and using modified towed seismic detection equipment to acquire field data,thus providing a new idea for seismic detection in this area.At the same time,a set of seismic signal extraction process and method combinations are made for coastal tidal-flat areas,which can retain effective seismic reflection information to the greatest extent and restore the underground geological structure.The results of the application show that the technology can provide reliable data support for the fine division of subsurface in the coastal tidal flats.
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Received: 13 February 2019
Published: 28 November 2019
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Corresponding Authors:
Bao-Wei ZHANG
E-mail: zhangbaowei@igge.cn
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Study area of coastal tidal flats
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Field work map of towed shallow high-precision seismic detection in coastal tidal-flat area
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| 道间距/m | 3 | | 炮间距/m | 6 | | 最小偏移距/m | 6 | | 采样间隔/ms | 0.25 | | 接收道数/道 | 24 | | 最大覆盖次数/次 | 6 |
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Basic parameters of field seismic acquisition
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Daily workload statistics
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Continuous single-shot seismic record of field quality control
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Spectrum of the effective reflections
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The original record of a certain three shots on the seismic survey in coastal tidal-flat area
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Extraction flow chart of seismic detected signal in coastal tidal-flat area
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Comparison of single-shot record before(a)and after(b) noise attenuation
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Comparison of single-shot record before(a)and after(b) true-amplitude recovery
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Comparison of single-shot record before(a)and after(b) deconvolution
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Spectrum comparison of single-shot record before(a) and after(b) deconvolution
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Autocorrelation of single-shot record before(a) and after(b) deconvolution
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Velocity spectrum of a CMP control point in detailed velocity analysis
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Comparison of single-shot record before and after NMO and cutting
a—before NMO;b—after NMO;c—after cutting
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Stack section of towed shallow high-precision seismic detection in coastal tidal-flat area
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Stack section spectrum of towed shallow high-precision seismic detection in coastal tidal-flat area
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