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ORIGIN OF AKABIRA CBM<br />
In Akabira mine simple hydrocarbon composition analysis was undertaken in several<br />
consecutive several months in 2001. Results from the samples taken from the different shaft<br />
entrances (Figure 6) suggest that <strong>gas</strong> compositions of the different sites indicate a regular<br />
pattern. For example, the richness in ethane (C 2 ) from the various shafts varies from higher to<br />
lower as shown below.<br />
No.3 > (KAMIUTA) > No.2 > >= KITAHAI >= No.1<br />
It is assumed that the western side of Akabira mine, situated on the western wing of the<br />
syncline and the hanging-wall of the faults, is richer in C 2 + than the eastern side as more deep<br />
<strong>gas</strong> has been injected from the western side. It is inferred that deep <strong>gas</strong>es migrated along<br />
several NNE trending faults (see Figure 2) and mixed with CBM (Figure 7).<br />
10.0%<br />
C2/(C1+C2)<br />
1.0%<br />
94% 95% 96% 97% 98% 99% 100%<br />
C1/(C1+C2)<br />
No.1 No.3 No.2<br />
KITA No.1(AIST) No.3(AIST)<br />
No.2(AIST) KITA(AIST) KAM IUTA(AIST)<br />
Figure 6. Result of compositional analysis at each<br />
mine entrance, Akabira.<br />
DEEPER GAS<br />
Figure 7. Mechanism of <strong>gas</strong> migration from deeper area.<br />
162 New Energy Resources in the <strong>CCOP</strong> Region - Gas Hydrates and Coalbed Methane
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