1. China National Offshore Oil Corporation Research Institute Co. Ltd, Beijing 100028, China; State Key Laboratory of Natural Gas Hydrate, Beijing100028, China 2. State Key Laboratory of Natural Gas Hydrate, Beijing100028, China; China National Offshore Oil Corporation, Beijing100021, China
The basic physical properties of marine natural gas hydrate deposits are important to the understanding of seabed growth conditions, occurrence regularity, and occurrence environment of natural gas hydrates. A comprehensive analysis of the core samples of drilling pressure-holding hydrate deposits at a depth of 1310 m in the Shenhu area of the South China Sea was conducted. The experimental results indicate that the particle size in the hydrate sediment samples are mainly distributed in the range from 7.81 µm to 21.72 µm, and the average particle size decreases as the depth of the burial increases. The X-ray CT analytical images and surface characteristics SEM scan images suggest that the sediment is mostly silty clay. There are a large number of bioplastics in the sediment, and the crack inside the core may be areas of hydrate formation.
. [J]. Frontiers in Energy, 2021, 15(2): 367-373.
Xin LYU, Qingping LI, Yang GE, Junlong ZHU, Shouwei ZHOU, Qiang FU. Fundamental characteristics of gas hydrate-bearing sediments in the Shenhu area, South China Sea. Front. Energy, 2021, 15(2): 367-373.
Field emission scanning electron microscopy(FESEM)
Nova Nano SEM450
FEI
Three-dimensional skeleton structure
X-ray CT
SMX-225CTX-SV
Shimadzu
Tab.1
Sample number
Sampling depth/m
Median diameter/µm
#1A-01
128.5
9.40
#1A-02
135.5
8.10
#1A-03
166.55
7.81
#2A-01
100
21.72
#2A-02
120.5
13.01
#2B-01
118
15.59
#2B-02
121
14.58
#2B-03
123
13.07
Tab.2
Fig.2
Fig.3
Fig.4
Fig.5
Fig.6
Fig.7
Fig.8
Item
Value
Diameter (D)/cm
5.050
High (H) /cm
1.930
Volume (Vs)/cm3
38.660
Specific gravity (Gs)
2.725
Wet weight (Mw)/g
79.042
Dry weight (MD)/g
59.922
Dry density (r)/(g·cm–3)
1.550
Porosity/F
0.431
Water content/%
31.908
Tab.3
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