Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (6): 1854-1864.doi: 10.13278/j.cnki.jjuese.20170292

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Numerical Evaluation of Electrical Resistance Tomography Monitoring of Sea Bed Basement Effect on Methane Leaks During Hydrate Production

Wu Jingxin1, Guo Xiujun1,2,3, Jia Yonggang1,2,3, Sun Xiang1, Li Ning1   

  1. 1. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, Shandong, China;
    2. Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering(Ocean University of China), Qingdao 266100, Shandong, China;
    3. Key Laboratory of Marine Environment and Ecology, Ministry of Education, Qingdao 266100, Shandong, China
  • Received:2018-09-07 Published:2018-11-26
  • Supported by:
    Supported by National Key Research and Development Program of China (2017YFC0307701) and National Natural Science Foundation of China (41772307, 41427803)

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Abstract: In order to effectively detect methane leakage of a sedimentary layer, we designed an in situ electricity monitoring system used in sea floor. The Shenhu gas hydrate production area in South China Sea was selected as the target area, and the corresponding geological models and resistivity models were established to evaluate the detection the capability of the system for methane leakage. The resistivity profiles with different acquisition parameters were calculated and analyzed by simulating and monitoring them with the designed electrical system. The simulation results indicate that the seawater forms a low-resistance stripe concomitant anomaly in a depth range of the detection profile, which suppress electrical signals in corresponding to its position. The top position of the concomitant anomaly can be defined as the effective monitoring depth. The effective monitoring depth is directly affected by the electrode distance, and the effective monitoring depth of the 10 m dipole-dipole array is about 50 m. Within the effective monitoring depth, the detection profile has a good reflection in a layered, agglomerate methane gathering area and a slow methane leaking area. The relative resistivity profiles obtained from the data processing can better reflect the boundaries of methane accumulation zones than electrical profiles. This in situ electricity monitoring system can effectively monitor the spatial variation of a methane leakage area in real time.

Key words: gas hydrate, methane leakage, electrical resistivity tomography, abnormal characteristics of detection profile

CLC Number: 

  • P738
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