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On electro-acoustic characteristics of a marine broadband sparker for seismic exploration
- Journal of Oceanology and Limnology Vol. 42, Issue 3, Pages: 760-771(2024)
- Affiliations：
1. Key Laboratory of Marine Geology and Metallogency, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2. Laboratory of Marine Geology, Laoshan Laboratory, Qingdao 266237, China
3. Key Laboratory of Fluid Transmission Technology of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
4. Key Laboratory of Submarine Acoustic Investigation and Application of Qingdao (Preparatory), Qingdao 266061, China
5. Key Laboratory of Deep Sea Mineral Resources Development, Shandong (Preparatory), Qingdao 266061, China
- Author bio：
peiyanliang@fio.org.cn
- Funds：
DOI：
CLC：Received：04 July 2023，
Online First：01 September 2023，
Published：01 May 2024
- Accepted：
Scan QR Code
LI Jing,LIU Kai,ZHANG Liancheng,et al.On electro-acoustic characteristics of a marine broadband sparker for seismic exploration[J].Journal of Oceanology and Limnology,2024,42(03):760-771.
摘要
Abstract
The construction of major marine infrastructure projects and the exploration and development of deep-sea mineral resources require fine imaging of seabed strata and structures. The high-resolution marine seismic exploration based on a high broadband sparker source is an important approach to reveal seabed stratum and reservoir structure
and identify geohazard. To optimize the performance of sparker seismic source
we investigated the electro-acoustic characteristics of spark discharge under conditions of different charging voltages and electrode numbers. Results show that the sound source level increased with the increase of the charging voltage
whereas the main frequency decreased when the charging voltage increases. In addition
it was found that the charging capacitance had more obvious influence on the main frequency than the sound source level did. Although the load energy decreased with increasing electrode number
the sound source level still increased but the main frequency decreased. Meanwhile
the primary to bubble (P/B) ratio increased with the increase of the electrode number. To gain a deeper insight into the electro-acoustic characteristics
we investigate the relationship between sound source level and power peak
from which a good correlation was observed. A more practical statistical analysis on the rise rate of current was processed
and a perfect logarithmic function was derived. Furthermore
we found that the main frequency was most possibly subjected to the electrical energy
especially the charging energy per electrode. The results indicate that the charging energy per electrode less than 10 J could increase the main frequency to above 300 Hz. At last
the main frequency could be reduced to 20 Hz when the charging energy of a single-electrode discharge was enhanced to over 4 kJ. This study shall be helpful in developing a sparker seismic source and improving the performance for marine engineering exploration and geohazard assessment.
关键词
Keywords
references
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