Simulation analysis of the detection effect of navigation marine direct current resistivity to seabed macro seepage and a system's design

Shang Kexu; Guo Xiujun; Wu Jingxin

doi:10.3969/j.issn.0253-4193.2019.01.014

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Article Navigation > Haiyang Xuebao > 2019 > 41(1): 142-150

Shang Kexu, Guo Xiujun, Wu Jingxin. Simulation analysis of the detection effect of navigation marine direct current resistivity to seabed macro seepage and a system's design[J]. Haiyang Xuebao, 2019, 41(1): 142-150. doi: 10.3969/j.issn.0253-4193.2019.01.014

Citation:

Shang Kexu, Guo Xiujun, Wu Jingxin. Simulation analysis of the detection effect of navigation marine direct current resistivity to seabed macro seepage and a system's design[J]. Haiyang Xuebao, 2019, 41(1): 142-150. doi: 10.3969/j.issn.0253-4193.2019.01.014

Citation:

Shang Kexu, Guo Xiujun, Wu Jingxin. Simulation analysis of the detection effect of navigation marine direct current resistivity to seabed macro seepage and a system's design[J]. Haiyang Xuebao, 2019, 41(1): 142-150. doi: 10.3969/j.issn.0253-4193.2019.01.014

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Simulation analysis of the detection effect of navigation marine direct current resistivity to seabed macro seepage and a system's design

doi: 10.3969/j.issn.0253-4193.2019.01.014

1.
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
2.
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

Received Date: 2017-11-06
Rev Recd Date: 2018-06-08

Abstract

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.
- marine resistivity method,
- cold spring,
- submarine gas leakage,
- plume,
- resistivity anomaly characteristics

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