Seismic Low-Frequency Shadow beneath Gas Hydrate in the Shenhu Area Based on the Stereoscopic Observation System

2017 ◽  
Vol 29 (3) ◽  
pp. 669-678 ◽  
Author(s):  
Xueqin Liu ◽  
Huaishan Liu ◽  
Lei Xing ◽  
Yanxin Yin ◽  
Jianhua Wang
Keyword(s):  
Gas Hydrate ◽  
Low Frequency ◽  
Observation System ◽  
Shenhu Area ◽  
Stereoscopic Observation

scholarly journals Elevated gas hydrate saturation within silt and silty clay sediments in the Shenhu area, South China Sea

2011 ◽  
Vol 116 (B5) ◽  
Author(s):  
Xiujuan Wang ◽  
Deborah R. Hutchinson ◽  
Shiguo Wu ◽  
Shengxiong Yang ◽  
Yiqun Guo
Keyword(s):  
South China Sea ◽  
South China ◽  
Gas Hydrate ◽  
Silty Clay ◽  
Shenhu Area ◽  
China Sea ◽  
Hydrate Saturation

Evaluation and comparison of gas production potential of the typical four gas hydrate deposits in Shenhu area, South China sea

Energy ◽  
2020 ◽  
Vol 204 ◽  
pp. 117955 ◽  
Author(s):  
Li Huang ◽  
Zhenyuan Yin ◽  
Yizhao Wan ◽  
Jianye Sun ◽  
Nengyou Wu ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Gas Hydrate ◽  
Gas Production ◽  
Production Potential ◽  
Shenhu Area ◽  
China Sea ◽  
Gas Hydrate Deposits

scholarly journals Reservoir stability in the process of natural gas hydrate production by depressurization in the shenhu area of the south China sea

2018 ◽  
Vol 5 (6) ◽  
pp. 631-643 ◽  
Author(s):  
Yizhao Wan ◽  
Nengyou Wu ◽  
Gaowei Hu ◽  
Xin Xin ◽  
Guangrong Jin ◽  
...  
Keyword(s):  
Natural Gas ◽  
South China Sea ◽  
South China ◽  
Gas Hydrate ◽  
The South China Sea ◽  
Natural Gas Hydrate ◽  
The South ◽  
Shenhu Area ◽  
China Sea

scholarly journals Permeability Evolution at Various Pressure Gradients in Natural Gas Hydrate Reservoir at the Shenhu Area in the South China Sea

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3688 ◽  
Author(s):  
Lu ◽  
Xia ◽  
Sun ◽  
Bian ◽  
Qiu ◽  
...  
Keyword(s):  
Pressure Gradient ◽  
Pore Structure ◽  
Gas Hydrate ◽  
Gas Production ◽  
Pressure Gradients ◽  
Permeability Evolution ◽  
Shenhu Area ◽  
Evolution Law ◽  
Hydrate Reservoir ◽  
Clayey Silt

The sediment of the hydrate reservoir in the Shenhu Area is mainly clayey silt. Its characteristic small particles and poor cementation challenge the quantification of the reservoir permeability during gas production. An accurate description of the seepage mechanism of the clayey-silt reservoir is the basis, and also a difficulty, of effective development of gas in the South China Sea. In this study, four sets of water seepage experiments under different pressure gradients are carried out using the clayey-silt reservoir sediments, in which the fourth sample was subjected to computed tomographic (CT) scans. The experimental results shows that the clayey-silt reservoir has a compression of the pore structure and decreasing permeability with the increasing pressure gradient. CT images are used to show the reduction of pore spaces for fluid flow. When the pressure gradient is less than 3 MPa per meter, the pore structure of the reservoir has minor changes. When the pressure gradient is greater than this value, the pore structure of the reservoir will be quickly compressed. This leads to a rapid decrease in permeability, and the process of permeability reduction is irreversible. The decrease of permeability can be predicted directly by establishing a power law model with the change of porosity. Our experimental results preliminarily reveal the dynamic evolution law of pore structure and permeability of clayey-silt reservoir in the process of gas hydrate exploitation via depressurization. The permeability evolution law at various pressure gradients provides a scientific and reasonable basis of a productivity control system for clayey-silt gas hydrate in depressurized gas production.

The Applied Research of Real-Time Monitoring System for Earthquake

2010 ◽  
Vol 143-144 ◽  
pp. 837-840
Author(s):  
Ying Li Liu ◽  
Te Liang Yan ◽  
Zhen Jiang
Keyword(s):  
Seismic Response ◽  
Real Time ◽  
Monitoring System ◽  
Strong Earthquake ◽  
Applied Research ◽  
Low Frequency ◽  
Observation System ◽  
Low Frequencies ◽  
Earthquake Observation ◽  
Type Apparatus

In the vibration isolating foundation buildings, build strong earthquake observation system, at the same time, join the seismic observation to this system, underground observation is carrying along with the observation of the seismic response on the ground and the buildings. The dynamic accelerator-type apparatus applied in the system, comes into being an accelerator-characteristics from 0.05HZ to 50HZ by electronics feeding back, enormously decrease affects of super low frequency interference and the linear and dynamic ranges can suffice the actual functions, avoids obviously errors of displacement-type apparatus in low frequencies, acquires satisfied effects.

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