多源频率域地震勘探技术及应用

doi:10.11720/wtyht.2024.1317

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Abstract

Due to various strong electromagnetic mechanical interference and traffic barriers, many geophysical exploration techniques are ineffective in urban geophysical exploration.Based on transient surface waves,microtremor arrays,and microtremor spectral ratios,this study synthetically extracted two kinds of characteristic curves for joint inversion from the multi-source frequency-domain seismic data obtained by multi-point three-component low-frequency sensors.Consequently,this study achieved multi-source frequency-domain seismic exploration that integrated three techniques and developed the two-source synthetic dispersive spectrum extraction technique,the two-source characteristic curve joint inversion technique,and the equivalent homogeneous medium forward modeling technique based on inhomogeneous media.Engineering practice results demonstrate the improvements in the exploration accuracy and efficiency.

Key words： multi-source frequency-domain seismic exploration transient surface wave microtremor array microtremor spectral ratio

Received: 07 August 2023 Published: 27 June 2024

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	Articles by authors
	Hong-Lin SUN
	Tie-Hua LIU
	Tie LIU
	Zhan-Rong ZHANG
	Zhi-Xing CHEN

Cite this article:

Hong-Lin SUN,Tie-Hua LIU,Tie LIU, et al. Multi-source frequency-domain seismic exploration technique and its application[J]. Geophysical and Geochemical Exploration, 2024, 48(3): 618-628.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1317 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I3/618

Technical flow of multi-source frequency domain seismic wave exploration

Schematic of data acquisition for linear observation device

Schematic of data acquisition for nonlinear observation device
a—embedded triangle type;b—concentric type;c—cross-bonding type;d—L-type;e—irregular type

Comparison of dispersion spectrum of multi-source data before and after merging
a—transient surface wave source dispersion spectrum;b—frequency dispersion spectrum of micro motion array source;c—mixed source dispersion spectrum

Image of microtremor spectral ratio curve

Schematic of equivalent dynamic weighting method

Spectral ratio curves of different measuring points

C7 comprehensive spectral ratio curve

The section plan of shear wave velocity after inversion
a—shear wave velocity profile based on inhomogeneous medium inversion;b—shear wave velocity profile based on horizontal water layered medium inversion

Comparison of the results of different data sources
a—transient surface wave;b—transient surface wave + micro motion array;c—transient surface wave + micro motion array + micro motion spectral ratio

Typical spectral ratio characteristic curve in exploration line

Schematic of comparison between inversion results of multi-source frequency domain seismic wave exploration and boreholes

Inversion and interpretation results

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