基于新型加速度型检波器在城市浅层-超浅层地震波联合勘探中的实验研究  

Experimental Study of a New Type of Acceleration Detector in Urban Shallow-Ultra Shallow Seismic Joint Exploration

作　　者：赵家福 姜鹏 张建 章建新 ZHAO Jiafu;JIANG Peng;ZHANG Jian;ZHANG Jianxin(Shenzhen Gongkan Geotechnical Engineering Co.,Ltd.Shenzhen 518026,China)

机构地区：[1]深圳市工勘岩土集团有限公司,深圳518026

出　　处：《广东土木与建筑》2024年第8期128-130,共3页Guangdong Architecture Civil Engineering

基　　金：深圳市科技创新委研发资金资助(重20180213)。

摘　　要：目前在浅层地震反射法中常用自然频率为60~100 Hz传统速度型检波器,经常遇到近震源道记录中反射波与干扰波(主要为面波)很难分辨的现象,需要一定的偏移距才能将其分辨清楚。同时最大偏移距又不能过大,由于目标层埋深很浅,若排列长度过大,记录的多为折射波,所以需要采用短排列、小道间距进行数据采集。在超浅层地震勘探中常采用多道面波分析技术(MASW),MASW是从多道地震数据记录中提取面波进行横波速度反演从而获取超浅层的第四系分层剖面。MASW中通常选用自然频率为4.5 Hz传统速度型检波器。两种勘探方式需要两种不同频率检波器,施工效率大大降低。针对上述问题,研究应用新型高灵敏度、频率范围较宽的加速度型检波器同时采集反射、面波数据。在采集数据时兼顾反射波最佳窗口技术和多道面波法最佳窗口技术,实现一次数据采集,两种不同地震信号处理方法,获得浅层地震反射剖面和超浅层横波速度剖面,可以达到相互验证相互补充的效果。At present,traditional velocity geophones with natural frequencies of 60~100 Hz are commonly used in shallow reflection seismic exploration.It is often difficult to distinguish between reflected waves and interference waves(mainly surface waves)in near-seismic source channel records,and a certain degree of deviation is required.The distance can be distinguished clearly.At the same time,the maximum offset cannot be too large.Because the target layer is buried very shallow,if the arrangement length is too large,most of the recorded waves are refracted waves,so it is necessary to adopt a short arrangement and small track spacing for data collection.Multi-channel surface wave analysis technology(MASW)is often used in ultra-shallow seismic exploration.MASW extracts surface waves from multi-channel seismic data records and performs shear wave velocity inversion to obtain ultra-shallow Quaternary layered sections.In MASW,a traditional velocity detector with a natural frequency of 4.5 Hz is usually used.The two exploration methods require two different frequency geophones,and the construction efficiency is greatly reduced.In response to the above problems,studies the application of a new type of high-sensitivity,wide frequency range acceleration detector to collect reflection and surface wave data at the same time.When collecting data,both the reflected wave best window technology and the multi-channel surface wave method best window technology can be used to achieve one-time data acquisition.Two different seismic signal processing methods can be used to obtain shallow seismic reflection profiles and ultra-shallow shear wave velocity profiles.To achieve the effect of mutual verification and complementation.

关 键 词：新型加速度检波器 浅层地震反射 MASW 联合勘探 

分 类 号：P631.4[天文地球—地质矿产勘探]