Geochemical Characteristics and Hydrocarbon Potential of the Coal in Muli Area of Qilian Mountain
Received date: 2014-09-28
Revised date: 2014-12-31
Online published: 2015-09-10
The viewpoints on the source rock of the NGH(natural gas hydrate)are controversial because of the limited researches on hydrocarbon potential of the source rocks in Muli area of Qilian Mountain.The coal samples from the main coal formation(J1-2y,T3g and C2y)were collected.Based on a comprehensive evaluation on the hydrocarbon potential of coal rocks,the characteristics of biomarkers in saturates and aromatics were studied.Coals from 3 formations in the Muli Area all belong to humic type.The coal samples in J1-2y belong to poor source rocks(The coal samples in Dongku coal mine belong to non-hydrocarbon source rocks),which has some hydrocarbon potential.However,the samples from T3g and C2y are not source rocks.The coal of J1-2y in Jiangcang and Hushan coal mines can even generate small amount of coal-derived oil.The coal in J1-2y from Juhugeng and Dongku coal mines belong to type A,and the coal-forming environment is weakly oxidizing marsh which can provide a large number of terrestrial organic matters.The coal samples in J1-2y from Hushan and Jiangcang coal mines and the coal samples in T3g from Shaliuhe profile belong to type B,the sedimentary environment is reductive shore-lacustrine covered by certain depth of water which can provide a large number of low hydrobiont organic matters.Both Type A and Type B are found in C2y of Kekeli village profile.
SONG Huan-xin,WEN Zhi-gang,BAO Jian-ping . Geochemical Characteristics and Hydrocarbon Potential of the Coal in Muli Area of Qilian Mountain[J]. Natural Gas Geoscience, 2015 , 26(9) : 1803 -1813 . DOI: 10.11764/j.issn.1672-1926.2015.09.1803
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