| 海底宏渗漏气体走航式海洋电阻率法探测效果模拟与观测系统设计 |
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| 引用本文： | 尚可旭,郭秀军,吴景鑫.海底宏渗漏气体走航式海洋电阻率法探测效果模拟与观测系统设计[J].海洋学报,2019,41(1):142-150. |
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| 作者姓名： | 尚可旭 郭秀军 吴景鑫 |
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| 作者单位： | 1.中国海洋大学 环境科学与工程学院, 山东 青岛 266100 |
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| 基金项目： | 国家自然科学基金（41772307）；国家重点研发项目（2017YFC0307701）；国家自然科学基金重大仪器专项（41427803）。 |
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| 摘 要： | 为实现海底宏渗漏气体连续调查，提出了一种走航式海洋电阻率探测技术。根据前人原位观测资料和含气水体电阻率特征构建地电模型；采用数值模拟和室内试验方法获得不同参数电阻率映像剖面，分析确定探测剖面异常特征，评价探测效果。在此基础上进一步进行了探测系统设计和实验测试。研究结果表明，走航式海洋电法探测电缆可由2个供电电流极和8个电位测量极组成，电位极距需小于0.05 m；测量可采用偶极装置通过并行采集方式实现。气体分布区表现为高阻异常，异常模式由走航速度、排列长度和气体分布区横向宽度共同决定，可分为7种情形；探测电阻率极大值和气体喷出流速存在正相关指数关系。该技术可实现气体分布范围和喷出速率快速探测。
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| 关 键 词： | 海洋电阻率法 冷泉 海底渗漏 羽状流 电阻率异常特征 |
| 收稿时间： | 2017/11/6 0:00:00 |
| 修稿时间： | 2018/6/8 0:00:00 |
Simulation analysis of the detection effect of navigation marine direct current resistivity to seabed macro seepage and a system's design |
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| Shang Kexu,Guo Xiujun and Wu Jingxin.Simulation analysis of the detection effect of navigation marine direct current resistivity to seabed macro seepage and a system''s design[J].Acta Oceanologica Sinica (in Chinese),2019,41(1):142-150. |
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| Authors: | Shang Kexu Guo Xiujun and Wu Jingxin |
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| Institution: | 1.College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China2.College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;Key Laboratory of Marine Environment and Geological Engineering of Shandong Province, Qingdao 266100, China;Key Lab of Marine Environment and Ecology, Ministry of Education, Qingdao 266100, China |
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| Abstract: | To achieve continuous survey of seabed macro seepage, the application of a navigation marine direct current resistivity survey method is initiated in this paper. To guarantee the feasibility of the proposed method, geoelectric models have been built based on the existing in-situ observation and resistivity characteristics of gas-bearing water. In this case, resistivity sections imagine with different design parameters are obtained by numerical simulation and laboratory tests; the anomaly characteristics of resistivity sections are analyzed and the detection effect of the method is evaluated. And on this basis, the design of detection system design and experimental test are further carried out. The study results indicate that the cable of navigation 2D electrical imaging system could be composed of 2 current electrodes and 8 voltage electrodes, and the spacing between electrodes must be less than 0.05 m; then measurement can be achieved by means of parallel acquisition of dipole-dipole array. Gas distribution area shows obvious high-resistivity anomaly. The pattern of this anomaly can be categorized into 7 types, which were jointly determined by the factors of travel speed, the length of the arrangement and the lateral width of the gas distribution area. There is a positive exponential relation between the maximum value of resistivity can be detected and the rate of gas eruption. Conclusively, the navigation 2D electrical imaging method is an demonstrated method which could effectively detect the range of gas distribution and the rate of gas eruption in a quick manner. |
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| Keywords: | marine resistivity method cold spring submarine gas leakage plume resistivity anomaly characteristics |
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