主动源与被动源面波联合勘探在黄土覆盖区三维成像中的应用

doi:10.11720/wtyht.2022.1546

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Abstract

Due to the strong attenuation effect of loess cover on seismic and electromagnetic waves, the successful application of seismic reflection wave method and electromagnetic wave method in loess covered area is limited.In view of the characteristics of large thickness and fine stratification of loess cover, the active source and passive source surface wave methods are combined in this paper, so that the advantages of the two surface wave methods are complementary and the geological stratification of loess covered area can be accurately detected.The study area is located in the suburb of Fengxiang County,Weihe Basin.It is a typical loess covered area, and the thickness of loess cover is 80~120 m.By processing the measured data of active and passive surface waves in the study area, the positions of the main strata on the 2D shear wave velocity profile are basically consistent with the actual borehole test results, and the 3D stratum structure in the study area is also obtained.The results of joint imaging show that it is feasible and effective to use passive and active surface wave joint exploration for stratification of loess covered area, which provides technical support and beneficial idea for geological mapping of loess covered area.

Key words： loess covered area active source surface wave passive source surface wave joint exploration 3D imaging

Received: 14 October 2021 Published: 17 August 2022

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	Guang-Zhou SHAO
	Yuan-Lin LI
	Liang YUE

Cite this article:

Guang-Zhou SHAO,Yuan-Lin LI,Liang YUE. Joint application of active and passive surface wave in 3D imaging of loess covered area[J]. Geophysical and Geochemical Exploration, 2022, 46(4): 897-903.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1546 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I4/897

Dispersion curves with different m values

Survey line layout of surface wave exploration in the study area

Spectrum of active source and passive source corresponding to point 1

Dispersion curves of surface wave at point 1

One-dimensional S-wave velocity profile at point 1

The inverted S-wave velocity profile by active surface wave method on Line 7

The inverted S-wave velocity profile by passive surface wave method on Line 1

Comparison of active and passive joint inversion profile,logging curves and lithology columns
a—S-wave velocity profile of joint inversion;b—acoustic logging curve and lithologic column of Well XY-6B

Results of strata division from joint inversion profile

Result of 3D geological modeling of strata(a) and fence diagram of 3D geological model(b) in the study area

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