coal mine methane and coalbed methane development in the ...

Coal Mine Methane And Coalbed Methane
Development In The Donetsk Region, Ukraine
The concentration of methane per ton of coal mined of the C13 coal bed at depths of 550-
700m produces 20-182 m 3 per ton. Increased methane flows were observed along the
monoclinal fold in the southern part of the mine area. The methane emissions from mining
the C11 coal bed are a little less than that of the C13 coal at 6-33 m 3 per ton. The coal bed
C10 2 was mined at depths of 600-700m. Its methane emissions were 16-17 m 3 per ton of coal
mined, much lower than that of the overlying coal-beds.
The lower levels of methane may be due to a high daily coal production, up to 700 tons a
day. The methane emissions from the C6 coal bed ranges from 32 to 69 m 3 per ton at depths
of 610 to 750 m. During a slow down in the extraction rate, methane production increased
sharply (almost twice as much) and is probably connected with high gas saturation of the
surrounding coal seams and strata.
From 1998 to 1999 the total volume of methane produced by the degasification system of the
mine was 6.16 million m 3 and when the ventilation system is included, it is estimated that 39
million m 3 was produced.
1.6.1.7 Gas In-Place
The gas-in-place of coal-beds and enclosed strata was measured in 20 core wells in the
complex KII-65 (MIG-65) as well as the composition of gases (Exhibit 1.17). In one of the
wells, the presence of natural gas in the coal-beds and enclosed strata was defined by the
MGRI complex method and with continuous gas logging. The collective properties of
sandstones were also defined for the determination of potential methane-bearing capacity of
the sands.
Depth Interval m Gas-in-Place by Coal Bed (m 3 /ton)
C13 C11 C10 2 C6
500 - 600 14.0 - - -
12.6-19.1 6.9 - 21.8 20.1-30.5
600 - 700
16.3
13 .7
25.3 -
10.2-12.4 8.5 - 21.0 9.0-11.7 10.4 - 34 .5
700 - 800
11.2
14.1
10.4
15.6
9.3-18.5 6.6-20.4
6.5-15.7
800 - 900
13.2
15.2 -
12.3
12.9-18.1
14.8-18.4
900 - 1000 -
15.5 -
16.4
13.6-18.2
1000 -1100 - - -
15.2
Exhibit 1.17 Gas-in-Place for Specific Depths, Yuzhno-Donbasskaya #3 Mine
Geologic Assessment and CMM/CBM Resource Base Analysis 1-24