李稳^1,2,,
陈颙^1,,,
王夫运²,
曹运兴³,
王恒知⁴,
田林³,
徐勇²,
郭新景²,
冯生强²,
扈效鹏²
1. 南京大学 地球科学与工程学院, 南京 210023
2. 中国地震局地球物理勘探中心, 郑州 450002
3. 河南理工大学 煤层气/瓦斯地质工程研究中心, 河南焦作 454000
4. 江苏省地震局, 南京 210014

基金项目: 国家重点研发计划项目（2018YFC1503200），国家自然科学基金项目（41790463，41774072，91214205，41674140，41704058），中国地震局地震科技星火计划项目（XH18063Y），中国地震局物探中心青年人才专项（YFGEC2017003，SFGEC2014006）联合资助


详细信息

作者简介: 李稳, 男, 1983年生, 博士后, 高级工程师, 主要从事勘探地震数据处理和主动震源研发方面的工作.E-mail:liwen_work@163.com

通讯作者: 陈颙, 男, 中国科学院院士, 主要从事地球物理学和地震学研究.E-mail:yongchen@nju.edu.cn

中图分类号: P315

收稿日期:2019-08-21
修回日期:2020-05-25
上线日期:2020-07-05

Feasibility study of developing one new type of seismic source via carbon dioxide phase transition

LI Wen^1,2,,
CHEN Yong^1,,,
WANG FuYun²,
CAO YunXing³,
WANG HengZhi⁴,
TIAN Lin³,
XU Yong²,
GUO XinJing²,
FENG ShengQiang²,
HU XiaoPeng²
1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
2. Geophysical Exploration Center, China Earthquake Administration, Zhengzhou 450002, China
3. Gas Geology and Engineering Research Center, Henan Polytechnic University, Jiaozuo Henan 454000, China
4. Jiangsu Earthquake Agency, Nanjing 210014, China


More Information

Corresponding author: CHEN Yong,E-mail:yongchen@nju.edu.cn

MSC: P315

--> Received Date: 21 August 2019
Revised Date: 25 May 2020
Available Online: 05 July 2020


摘要
摘要:为了研究二氧化碳物理相变技术应用于新型震源研发的可行性，在地下成层性较好的某煤田地震测区，开展了利用二氧化碳相变技术激发地震波的野外人工震源激发-接收实验.并与传统炸药震源进行了对比.地震数据利用Aries2.66型垂直分量反射地震仪和PDS-2型三分量地震仪接收.根据实测地震数据，从野外地震记录震相识别，初至波传播距离分析，震源近场地震信号时频分析，CO₂相变激发震源子波提取和基于CO₂震源子波的地震初至波波形反演实验等多个方面，进行了关于CO₂相变激发技术能否产生地震波信号以及能否将其应用于新型震源研发的可行性研究.研究结果表明CO₂物理相变膨胀能够产生能量集中的地震波信号；在实验区地质条件和激发参量下地震记录中初至波的可识别的传播距离约为1 km；震源近场地震信号的主频集中在8~13 Hz；利用震源近场数据提取了CO₂震源子波；通过地震初至波波形反演实验认为这种震源子波能够应用于波形反演等方面的研究.因为CO₂相变激发具有绿色、环保、安全等方面的优点，若能进一步在激发能量、激发—延迟时间一致性等方面加以改进，该技术有望在城市隐伏活动断层探测、城市地下空间探测、煤矿高瓦斯环境人工地震勘探等领域发挥重要的作用.
关键词: 主动震源研发/
二氧化碳物理相变/
时频分析/
震源子波/
初至波波形反演

Abstract:The purpose of this work is to examine the feasibility of developing a new type of the active seismic source using carbon dioxide phase transition. In a coal mine with good subsurface layering,field experiments with seismic wave exciting of this source and receiving were made and compared with the traditional explosive source. The Aries2.66 type vertical seismograph and PDS-2 type three-component seismograph were employed to receive seismic signals. Based on the observational data,the subsequent work includes identifying seismic phases,analyzing first arrival wave's propagation distance,time-frequency of near-field seismic signals,the source wavelet extracting and the testing of seismic first arrival wave waveform inversion based on CO₂ source wavelet. Research results reveal that the CO₂ phase transition can generate energy-focused seismic signals. The first arrival wave's propagation distance is about 1.0 kilometer. The main frequency of near-field seismic signals is 8 to 13 Hz,and the source wavelet of CO₂ phase transition can be extracted utilizing the near-field seismic data. Tests of first arrival wave waveform inversion suggest that the CO₂ source wavelet could be used in waveform inversion studies. Because of its safety and eco-friendly,though needing improvement in exciting energy and consistence between excitation and delay times,this CO₂ phase transition technique may play an important role in seismic surveys of high gas environments,urban underground space and hidden active faults in cities.
Key words:Active seismic source development/
Carbon dioxide phase transition/
Time-frequency analysis/
Source wavelet/
First arrival wave waveform inversion



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