Journal of Tropical Oceanography >
Large-energy plasma seismic source for gas hydrate exploration
Received date: 2016-04-19
Request revised date: 2016-05-31
Online published: 2017-01-19
Supported by
National High-tech R&D Program (2013AA092501)
Development of gas hydrate exploration technology (GZH201100307)
Copyright
The development of plasma seismic source with large energy output of 50 kJ for gas hydrate exploration in China was introduced in this paper. The structure of the source was compactly designed, and devices were integrated in a mobile laboratory in containers for convenient transport and operation. The field test results showed that the maximum penetration depth of strata of the source was over 1000 m. Compared with the traditional source, the plasma seismic source had higher stratigraphic resolution and improved the reliability of geophysical recognition of gas hydrate. The successful development of the 50 kJ plasma seismic source system broke the international monopoly by whom, and has great significance for China's marine engineering, marine science research and national defense.
Key words: gas hydrate; large energy; plasma seismic source
HAO Xiaozhu , ZHAO Qingxian , PEI Yanliang . Large-energy plasma seismic source for gas hydrate exploration[J]. Journal of Tropical Oceanography, 2017 , 36(1) : 35 -40 . DOI: 10.11978/2016041
Tab. 1 Main parameters of 50 kJ plasma source表1 50kJ等离子体震源的主要参数 |
指标 | 参数 |
---|---|
储能电容 | 3000μF |
充电电压 | -2.0 ~ -6.0kV |
脉冲能量等级 | 5000J至50kJ可调; 步长: 1000J |
脉冲发射频率 | 0.25~1Hz |
脉冲传输线 | 24芯/Φ65mm/110m |
电极阵列 | 方阵/3600电极/Φ1.4mm |
触发方式 | 自动/手动/被动 |
尺寸 | 4.00m×2.20m×2.33m |
重量 | 5000kg |
Fig. 1 Diagram of the 50 kJ pulse plasma power circuit图1 50kJ脉冲等离子体电源电路原理图 |
Fig. 2 Structure diagram of the 24 core high voltage and low consumption cable (left) and the winch (right)图2 24芯高压低耗的传输电缆结构图(左)与绞车(右) |
Fig. 3 Multi-electrode emitter array图3 多电极发射阵 |
Tab. 2 Design parameters of underwater emitter array with 3600 electrodes表2 3600电极的水下发射阵设计参数 |
指标 | 参数 |
---|---|
阵尺寸 | 2.10m×1.15m×0.38m |
阵重量 | 280kg |
电极数 | 3600 |
电极排列 | 18×200 |
电极横向间距 | 51mm |
电极纵向间距 | 12mm |
Fig. 4 General design of the 50 kJ plasma seismic source system图4 50kJ等离子体震源系统总装设计图 |
Fig. 5 BOLT air gun source structure and the wavelet view图5 BOLT气枪震源结构与子波特性图 |
Fig. 6 Partial sea trial seismic profile图6 部分海试地震剖面 |
Fig. 7 The spectrum of received signals. a) 50 kJ plasma source; b) BOLT air gun source图7 震源接收信号频谱 |
Fig. 8 The comparison of seismic data velocity anomalies. a) seismic section; b) 50 kJ plasma source; c) BOLT air gun source图8 地震资料速度异常对比 |
The authors have declared that no competing interests exist.
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