Design and experiment of resistivity monitoring probe for gas migration in marine sand

Sun Xiang; Guo Xiujun; Wu Jingxin

doi:10.3969/j.issn.0253-4193.2020.05.013

Volume 42 Issue 5

Nov. 2020

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Sun Xiang，Guo Xiujun，Wu Jingxin. Design and experiment of resistivity monitoring probe for gas migration in marine sand[J]. Haiyang Xuebao，2020, 42(5)：139–149，doi:10.3969/j.issn.0253−4193.2020.05.013

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Design and experiment of resistivity monitoring probe for gas migration in marine sand

doi: 10.3969/j.issn.0253-4193.2020.05.013

Sun Xiang^{1, 3
,},
Guo Xiujun^{1, 2
,
,},
Wu Jingxin^{1, 3}

1.
Shandong Key Laboratory of Marine Environmental Geological Engineering, Qingdao 266100, China
2.
Key Laboratory of Marine Environment and Ecology, Ministry of Education, Qingdao 266100, China
3.
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China

Received Date: 2019-03-25
Rev Recd Date: 2019-07-25

Available Online: 2020-11-18

Publish Date: 2020-05-25

Abstract

Abstract

Under the influence of buoyancy and static or dynamic pressure, submarine shallow gas stored on high penetrability soil aggregates and migrates in uprightness and horizontal direction, which inducing stratum deformation and failure. For the purpose of real-time monitoring geological hazard induced by gas as well as early warning, a new type of in situ gas migration monitoring technology is discussed. Two resistivity probes with point-shaped electrode and ring-shaped electrode were respectively designed and manufactured based on the electrostatic field measurement principle. On the basis of detection accuracy analysis, continuous gas diffusion monitoring experiments in sand with three dissimilar gas injection rate are performed. As a result, both resistivity measurement error of two probes are less than 0.1%. With a high measuring sensitivity, the point-shaped electrode probe is capable of monitoring the variation of gas content, gas accumulation, gas dispersing and corresponding rate. The ring-shaped electrode probe has a relatively low sensitivity measurement, while it could monitor the spatio-temporal gas migration in sand soil. Understanding the pros and cons, each probe is able to implement effectively monitoring gas migration.
- shallow gas,
- resistivity probe,
- gas migration,
- in situ monitoring

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References(20)

References

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