基于二氧化碳气动力脉冲技术的人工震源试验初探

Preliminary study on the test of artificial seismic source based on the technology of CO2 aerodynamic pulse

如今正处于城市地下空间开发的大背景下,而在城市地下空间的开发中,地质勘探无疑是不可或缺的重要组成部分。着眼于城市地下勘探中效率较高、成本较低的地球物理勘探技术,测试了一种气动便携式人工震源,主要特点是通过二氧化碳气动力脉冲的方式产生冲击波,目的在于增强可控震源探测的环保性和城市复杂环境下的适应性。研究表明,二氧化碳气动力脉冲形成的单炮记录中直达波、声波、反射波、面波清晰,整体形态符合地震勘探的单炮记录。根据区域地质资料,试验场地下方安山岩厚度巨大,受测线长度与地质条件限制,本次试验单炮记录没有明显的反射轴。

At present it is under the background of urban underground space development.In the development of urban underground space,geological exploration is undoubtedly an indispensable and important part.Focusing on the geophysical exploration technology with high efficiency and low cost in urban underground exploration,this paper tests a kind of pneumatic portable artificial seismic source,which is mainly characterized by producing shock wave by means of carbon dioxide aerodynamic pulse.The purpose is to enhance the environmental protection of controllable seismic source detection and the adaptability in urban complex environment.The result shows that the direct wave,acoustic wave,reflected wave and surface wave are clear in the single shot records formed by CO2 aerodynamic pulse,and the overall shape is consistent with the single shot records of seismic exploration.According to the regional and geological data,the thickness of the underground andesite in the test site is huge.Due to the limitation of the length of the survey line and geological condition,there is no obvious reflection axis recorded by the single shot in this test.