gas hydrate - CCOP

PROPERTIES OF ANTHRACITE
The coals from the SCCF and CNCF are representatively chosen to compare characteristic
properties between Permian and Jurassic coals in Korea. Macerals of anthracites consist
predominantly of vitrinite and inertinite with lesser amounts of graphinite, impregnite and
mottlite, which are seldom observed in the bituminous coal or lignite (Park & Shibaoka,
1987). The formation of graphinite, impregnite and mottlite seems to be primarily controlled
by pressure rather than temperature. Vitrinite comprises mostly telocollinite in the SCCF,
while it is represented by desmocollinite in the CNCF. Their difference in vitrinite contents
suggests that the sedimentation of coal-bearing strata of the SCCF, compared to the CNCF,
occurred in a more stable depositional environment.
The lithological characteristics of coal-bearing strata in the SCCF (Permian) and CNCF
(Jurassic) are presented in Table 2. The degrees of coalification in the Permian and Jurassic
anthracites are in the range of 4.6 to 6.1 (Rmoil) and 3.3 to 4.3 (Rmoil), respectively (Figure
6). The average of vitrinite brief lectance (Ro max-min) is 2.61 from the SCCF, while it is
3.53 from the CNCF, suggesting that the former is in the late stage of qualification and the
latter is in the stage of graphitization (Table 3). The X-Ray diffraction pattern also shows that
the Jurassic anthracite has a more perfect alignment than Permian anthracite.
Table 4 represents the average chemical composition of the anthracite. The ash fusion
temperature of Korean anthracite is higher than that of any anthracite in other parts of the
world. The ignition temperature ranges from 420°C to 720°C (avg.: 553°C) and combustion
velocity range is 0.6 mg/min ~2.8 mg/min (avg.: 1.4 mg/min).
initial deformation: 1100°C - 1670°C (avg.: 1306°C)
hemisphere: 1220°C - 1680°C (avg.: 1520°C)
flowage: 1220°C - 1700+°C (avg.: 1556°C)
Table 2. Lithologic characteristics of coal-bearing strata in the SCCF and CNCF
Lithologic characteristics
Samcheog Chungnam
(Carbo-Permian) (Jurassic)
thickness of coal bearing strata
number of coal seams
average seam thickness
aggregate thickness of coal
average proportion of coal in measures
Associated rock
170 m
5 - 7
0.8m
5m
2.9%
ss, sh, ls
1800m
25 - 30
0.2m
6m
0.3%
cong, ss, sh
depositional environment deltaic lacustrine
basin stability stable unstable
tectonic movement not active active
124 New Energy Resources in the CCOP Region - Gas Hydrates and Coalbed Methane