scholarly journals In situ and laboratory evidence for high electrical anisotropy in marine gas hydrate

2020 ◽  
Author(s):  
S Constable ◽  
R Lu ◽  
P Kannberg ◽  
L A Stern ◽  
W L Du Frane ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Electrical Anisotropy ◽  
Laboratory Evidence ◽  
Marine Gas Hydrate

Preparation of Warm Brine in Situ Seafloor Based on the Hydrate Process for Marine Gas Hydrate Thermal Stimulation

2014 ◽  
Vol 53 (36) ◽  
pp. 14142-14157 ◽  
Author(s):  
Zhaoyang Chen ◽  
Jingchun Feng ◽  
Xiaosen Li ◽  
Yu Zhang ◽  
Bo Li ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Thermal Stimulation ◽  
Marine Gas Hydrate

scholarly journals In-situ marine gas hydrate production methane leaks electrical monitoring system

2021 ◽  
Vol 267 ◽  
pp. 02041
Author(s):  
Hanfu Wu ◽  
Xiujun Guo ◽  
Jingxin Wu ◽  
Yufeng Zhang
Keyword(s):  
Monitoring System ◽  
Gas Hydrate ◽  
Power Module ◽  
General Control ◽  
Regional Monitoring ◽  
Methane Leakage ◽  
Marine Gas Hydrate ◽  
Leakage Monitoring ◽  
The Cost

In the process of gas hydrate exploitation, methane leakage needs to be monitored in real time, so an in-situ electrical monitoring system for methane leakage is designed. The monitoring system is mainly composed of monitoring cable, acquisition station, power module and general control platform. According to the electrical principle, the system carries out regional monitoring on the seabed formation, forms the resistivity map, and realizes methane leakage monitoring. The cost of the monitoring system is low, and it can be remotely controlled or automatically collected data according to the preset program, so the system has good application and research value.

scholarly journals Electrical anisotropy due to gas hydrate-filled fractures

Geophysics ◽  
2010 ◽  
Vol 75 (6) ◽  
pp. F173-F185 ◽  
Author(s):  
Ann E. Cook ◽  
Barbara I. Anderson ◽  
Alberto Malinverno ◽  
Stefan Mrozewski ◽  
David S. Goldberg
Keyword(s):  
Gas Hydrate ◽  
Unconsolidated Sediments ◽  
Electrical Anisotropy ◽  
High Resistivity ◽  
Continental Margins ◽  
Resistivity Measurements ◽  
Resistivity Logs ◽  
Logging While Drilling ◽  
Measured Resistivity

In 2006, the Indian National Gas Hydrate Program Expedition 01, or NGHP-01, discovered gas hydrate as fill in near-vertical fractures in unconsolidated sediments at several drilling sites on the Indian continental margins. These gas hydrate-filled fractures were identified on logging-while-drilling resistivity images. The gas hydrate-filled fracture intervals coincide with high measured resistivity at the NGHP-01 sites. High measured resistivity translates into high hydrate saturations via Archie’s equation; however, these high saturations contradict lower gas hydrate saturations determined from pressure core and chlorinity measurements. Also, in intervals with near-vertical gas hydrate-filled fractures, there is considerable separation between phase shift and attenuation resistivity logs, with [Formula: see text] resistivity measurements being significantly higher than [Formula: see text] resistivity measurements. We modeled the sensitivity of the propagation resistivity measurements in the gas hydrate-filled fracture intervals at NGHP-01 Sites 5 and 10. Near-vertical hydrate-filled fractures can cause the abnormally high resistivity measurements in vertical holes due to electrical anisotropy. The model suggests the gas hydrate saturations in situ are usually significantly lower than those calculated from Archie’s equation. In addition, these modeled gas hydrate saturations generally agree with the lower gas hydrate saturations obtained from pressure core and chlorinity measurements at NGHP-01 Sites 5 and 10.

APPLICATION OF SEISMIC DETECTING TECHNIQUE TO MARINE GAS HYDRATE SURVEY

2011 ◽  
Vol 31 (4) ◽  
pp. 51-58 ◽  
Author(s):  
Guangxue ZHANG ◽  
Ming ZHANG ◽  
Shengxiong YANG ◽  
Xinhua LEI ◽  
Huaning XU ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Marine Gas Hydrate
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