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MODERN TUNNELLING TECHNOLOGY 2019, Vol. 56 Issue (6) :41-46    DOI:
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Research on the Distribution Characteristics and Migration Law of Shallow Natural Gas of Longquanshan Tunnel on Chengdu Metro
(China Power Construction Chengdu Construction Investment Co., Ltd., Chengdu 610212)
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Abstract The shallow natural gas bearing reservoir of the Longquanshan tunnel of Chengdu metro is the sand? stone reservoir of Jurassic Shaximiao formation, and its distribution characteristics are affected by the Wolongmiao syncline, Longquanyi anticline and Ma′anshan fault structure. Based on an analysis of the geological drilling test, it is found that the shallow natural gas of Longquanshan tunnel has close correlation with sandstone bed, natural gas migrates from the sandstone reservoir and fractured zone of fault to the tunnel excavation space, and the preventive measures are designed based on two areas of high gas risks and three areas of low gas risks; the gas is mainly distributed at the place nearby the three geological structures, especially the gas concentration is high at the deep sandstone stratum of the west wing of Wolongmiao syncline.
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TANG Bin
KeywordsMetro tunnel;Shallow natural gas;Geological structure   Distribution Characteristics;Migration law     
Abstract: The shallow natural gas bearing reservoir of the Longquanshan tunnel of Chengdu metro is the sand? stone reservoir of Jurassic Shaximiao formation, and its distribution characteristics are affected by the Wolongmiao syncline, Longquanyi anticline and Ma′anshan fault structure. Based on an analysis of the geological drilling test, it is found that the shallow natural gas of Longquanshan tunnel has close correlation with sandstone bed, natural gas migrates from the sandstone reservoir and fractured zone of fault to the tunnel excavation space, and the preventive measures are designed based on two areas of high gas risks and three areas of low gas risks; the gas is mainly distributed at the place nearby the three geological structures, especially the gas concentration is high at the deep sandstone stratum of the west wing of Wolongmiao syncline.
KeywordsMetro tunnel;Shallow natural gas;Geological structure,   Distribution Characteristics;Migration law     
Cite this article:   
TANG Bin .Research on the Distribution Characteristics and Migration Law of Shallow Natural Gas of Longquanshan Tunnel on Chengdu Metro[J]  MODERN TUNNELLING TECHNOLOGY, 2019,V56(6): 41-46
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http://www.xdsdjs.com/EN/      或     http://www.xdsdjs.com/EN/Y2019/V56/I6/41
 
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