• You are welcome to ERC!
引用本文:
【打印本页】   【HTML】   【下载PDF全文】   View/Add Comment  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 41次   下载 50 本文二维码信息
码上扫一扫!
分享到: 微信 更多
Characteristics of the Seismic Waves from a New Active Source Based on Methane Gaseous Detonation
WANG Weitao1, WANG Xiang2,3, MENG Chuanmin2,3, DONG Shi2,3, WANG Zhigang2,3, XIE Junju1, WANG Baoshan4, YANG Wei1, XU Shanhui1, WANG Tao5
1.Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, CEA, Beijing 100081, China;2.National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, Mianyang 621999, Sichuan, China;3.Joint Laboratory of High Pressure Physics and Seismology, Institute of Fluid Physics, CAEP, Mianyang 621999, Sichuan, China;4.School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;5.Institute of Geophysics and Geodynamics, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China
摘要:
Active seismic sources are critical for obtaining high resolution images of the subsurface. For active imaging in urban areas, environment friendly and green seismic sources are required. In present work, we introduce a new type of green active source based on the gaseous detonation of methane and oxygen. When fired in a closed container, the chemical reaction, i.e. gaseous detonation, will produce high pressure air over 150MPa. Seismic waves are produced when high pressure air is quickly released to impact the surroundings. The first field experiment of this active source was carried out in December, 2017 in Jingdezhen, Jiangxi Province, where a series of active sources were excited to explore their potential in mine exploration. In current work, we analyzed the seismic waves recorded by near-field accelerators and a dense short-period seismic array and compared them with those from a mobile airgun source, another kind of active source by releasing high pressure air into water. The results demonstrate that it can be used for high resolution near surface imaging. Firstly, the gaseous detonation productions are harmless CO2 and water, making it a green explosive source. Secondly, the dominant seismic frequencies are 10-80Hz and a single shot can be recorded up to 15km, making it suitable for local structure investigations. Thirdly, it can be excited in vertical wells, similar to traditional powder explosive sources. It can also act as an additional on-land active source to airgun sources, which requires a suitable water body as intermediate media to generate repeating signals. Moreover, the short duration and high frequency signature of the source signals make it safe with no damage to nearby buildings. These make it convenient to excite in urban areas. As a new explosive source, the excitation equipment and conditions, such as gas ratio, sink depth and air-releasing directions, need further investigation to improve seismic wave generation efficiency.
关键词:  Active source  Seismic waves  Methane detonation source  Green seismic source
DOI:10.19743/j.cnki.0891-4176.201902003
分类号:
基金项目:This project is jointly sponsored by the National Key Research and Development Plan (2018YFC1503200),National Natural Science Foundation of China(41674061, 41474058 and 41790463); the Special Fund of the Institute of Geophysics, China Earthquake Administration (DQJB19B25).
Characteristics of the Seismic Waves from a New Active Source Based on Methane Gaseous Detonation
WANG Weitao1, WANG Xiang2,3, MENG Chuanmin2,3, DONG Shi2,3, WANG Zhigang2,3, XIE Junju1, WANG Baoshan4, YANG Wei1, XU Shanhui1, WANG Tao5
1.Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, CEA, Beijing 100081, China;2.National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, Mianyang 621999, Sichuan, China;3.Joint Laboratory of High Pressure Physics and Seismology, Institute of Fluid Physics, CAEP, Mianyang 621999, Sichuan, China;4.School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;5.Institute of Geophysics and Geodynamics, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China
Abstract:
Active seismic sources are critical for obtaining high resolution images of the subsurface. For active imaging in urban areas, environment friendly and green seismic sources are required. In present work, we introduce a new type of green active source based on the gaseous detonation of methane and oxygen. When fired in a closed container, the chemical reaction, i.e. gaseous detonation, will produce high pressure air over 150MPa. Seismic waves are produced when high pressure air is quickly released to impact the surroundings. The first field experiment of this active source was carried out in December, 2017 in Jingdezhen, Jiangxi Province, where a series of active sources were excited to explore their potential in mine exploration. In current work, we analyzed the seismic waves recorded by near-field accelerators and a dense short-period seismic array and compared them with those from a mobile airgun source, another kind of active source by releasing high pressure air into water. The results demonstrate that it can be used for high resolution near surface imaging. Firstly, the gaseous detonation productions are harmless CO2 and water, making it a green explosive source. Secondly, the dominant seismic frequencies are 10-80Hz and a single shot can be recorded up to 15km, making it suitable for local structure investigations. Thirdly, it can be excited in vertical wells, similar to traditional powder explosive sources. It can also act as an additional on-land active source to airgun sources, which requires a suitable water body as intermediate media to generate repeating signals. Moreover, the short duration and high frequency signature of the source signals make it safe with no damage to nearby buildings. These make it convenient to excite in urban areas. As a new explosive source, the excitation equipment and conditions, such as gas ratio, sink depth and air-releasing directions, need further investigation to improve seismic wave generation efficiency.
Key words:  Active source  Seismic waves  Methane detonation source  Green seismic source