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An Experimental Study on Modulating the Large Volume Airgun Array Signals through Asynchronous Excitation
YANG Wei1, WANG Baoshan1,2, LUO Mingzhang3, LI Xiaobin4, CHEN Yong1,5
1.Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, CEA, Beijing 100081, China;2.School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;3.School of Electronic Information, Yangtze University, Jingzhou 434100, Hubei, China;4.Yunnan Earthquabe Agency, Kunming 650224, China;5.Institute of Geophysics and Geodynamics, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China
摘要:
Large volume airgun arrays have been widely used in exploring and monitoring underground structures for nearly a decade. Nowadays, large volume airgun arrays adopt the synchronous excitation mode, and source characteristics are controlled by the source signal of a single airgun, which to some extent limits its application. In order to realize the asynchronous excitation of the airgun array, we developed a new firing system for the airgun array, and carried out a field experiment in the Binchuan Fixed Airgun Signal Transmission station to study the influences of the asynchronous excitation on the source signal. The experimental results show that:the newly developed airgun array firing system can ignite the airguns according to the setting time series with high precision. By designing the excitation time series, the asynchronous excitation can enhance the energy of airgun source signal at 3-5Hz, and reduce the energy of pressure pulse wave at 6-18Hz. The signal detection capability of the asynchronous excitation with time series mode is equivalent to the synchronous excitation.
关键词:  Active source  Large volume airgun  Asynchronous excitation  Source characteristics  High precision
DOI:10.19743/j.cnki.0891-4176.201902004
分类号:
基金项目:This project was sponsored by the National Key R&D Program of China (2018YFC1503202) and the National Natural Science Foundation of China (41574052, 41790463).
An Experimental Study on Modulating the Large Volume Airgun Array Signals through Asynchronous Excitation
YANG Wei1, WANG Baoshan1,2, LUO Mingzhang3, LI Xiaobin4, CHEN Yong1,5
1.Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, CEA, Beijing 100081, China;2.School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;3.School of Electronic Information, Yangtze University, Jingzhou 434100, Hubei, China;4.Yunnan Earthquabe Agency, Kunming 650224, China;5.Institute of Geophysics and Geodynamics, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China
Abstract:
Large volume airgun arrays have been widely used in exploring and monitoring underground structures for nearly a decade. Nowadays, large volume airgun arrays adopt the synchronous excitation mode, and source characteristics are controlled by the source signal of a single airgun, which to some extent limits its application. In order to realize the asynchronous excitation of the airgun array, we developed a new firing system for the airgun array, and carried out a field experiment in the Binchuan Fixed Airgun Signal Transmission station to study the influences of the asynchronous excitation on the source signal. The experimental results show that:the newly developed airgun array firing system can ignite the airguns according to the setting time series with high precision. By designing the excitation time series, the asynchronous excitation can enhance the energy of airgun source signal at 3-5Hz, and reduce the energy of pressure pulse wave at 6-18Hz. The signal detection capability of the asynchronous excitation with time series mode is equivalent to the synchronous excitation.
Key words:  Active source  Large volume airgun  Asynchronous excitation  Source characteristics  High precision