多源频率域地震勘探技术及应用

doi:10.11720/wtyht.2024.1317

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摘要

在城市地球物理勘探中,因受到城市中各种强电磁机械干扰和交通建筑阻隔,诸多地球物理勘探技术勘探效果不佳。本文基于瞬态面波、微动台阵和微动谱比,采用多点三分量低频传感器获取的多源频率域地震数据,综合提取两种特征曲线后进行联合反演,实现融合3种技术的多源频率域地震勘探。其中,提出了双源综合频散谱提取技术、双源特征曲线联合反演技术和基于非均匀介质的等效均匀介质正演技术,勘探成果的精度和效率均得到了提高,在工程实践中得到验证。

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	孙红林
	刘铁华
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	张占荣
	陈支兴

关键词 ：多源频率域地震勘探, 瞬态面波, 微动台阵, 微动谱比

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

收稿日期: 2023-08-07 修回日期: 2024-03-28 出版日期: 2024-06-20

ZTFLH:

P631.4

基金资助:湖北省重点研发计划项目(2021BAA050);国家重点研发计划项目(2019YFC0605101)

通讯作者: 刘铁华(1983-),男,高级工程师,长期从事工程地球物理技术与设备研究工作。Email:liutiehua@crfsdi.com

作者简介: 孙红林(1973-),男,教授级高级工程师,注册土木(岩土)工程师

引用本文:

孙红林, 刘铁华, 刘铁, 张占荣, 陈支兴. 多源频率域地震勘探技术及应用[J]. 物探与化探, 2024, 48(3): 618-628.
SUN Hong-Lin, LIU Tie-Hua, LIU Tie, ZHANG Zhan-Rong, CHEN Zhi-Xing. Multi-source frequency-domain seismic exploration technique and its application. Geophysical and Geochemical Exploration, 2024, 48(3): 618-628.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2024.1317 或 https://www.wutanyuhuatan.com/CN/Y2024/V48/I3/618

Fig.1 多源频率域地震勘探技术流程

Fig.2 线性观测装置数据采集示意

Fig.3 非线性观测装置数据采集示意
a—内嵌三角形型;b—同心圆型;c—十字型;d—L型;e—不规则型

Fig.4 多源数据的频散谱合并前后对比
a—瞬态面波源频散谱;b—微动台阵源频散谱;c—混合源频散谱

Fig.5 微动谱比曲线

Fig.6 动态优选法原始示意

Fig.7 不同测点谱比曲线

Fig.8 C7测点综合谱比曲线

Fig.9 反演后的横波速度剖面成果
a—基于非均匀介质反演的横波速度剖面;b—基于水平水层层状介质反演的横波速度剖面

Fig.10 不同数据源情况下的成果图对比
a—瞬态面波;b—瞬态面波+微动台阵;c—瞬态面波+微动台阵+微动谱比

Fig.11 勘探测线内的典型谱比特征曲线

Fig.12 多源频率域地震勘探反演成果与钻孔对比示意

Fig.13 反演与解释成果

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