摘要
潮水盆地位于河西走廊东段北侧,地跨甘肃、内蒙古两省区,蕴藏一定的煤炭和油气资源,红沙岗地区是其中重要的煤炭富集区,煤炭资源量约12×108t。为弄清楚该区的煤层气勘探前景,详细研究了其煤层气地质条件。结果认为:该区煤层以低煤阶长焰煤为主,厚3～35m,分布稳定,顶部煤层直接盖层为油页岩,煤层气保存条件较好,具有一定的煤层气勘探潜力;但部分地区煤层含气量低,关键原因在于煤层缺少后期生物气的补充。进而指出了该区煤层气勘探的方向:古地温异常、煤阶较高、保存条件较好的地区是该区的煤层气富集区;其中红沙岗北部具有缺氧、低矿化度和低温环境,大量微生物细菌可能存活,并代谢甲烷、正烷烃和其他有机物,煤层的含气量能得到补充,具有较大的勘探价值。
The Chaoshui Basin is situated in the northern slope of the eastern Hexi Corridor,crossing over Gansu and Inner Mongolia.Some coal and hydrocarbon resources have been discovered in this basin,where the Hongshagang area is the important coal enrichment region with coal reserves of 12×108 t.Thus,in order to make clear the coalbed methane (CBM) gas exploration potential in this region,its geological conditions are studied in detail.The results show that coal beds in this region is dominated by low-rank long-flame coal with the thickness of 3-35 m,which is in even distribution; oil shale as natural sealing rocks provides favorable preservation conditions for CBM gas reservoirs; all those above prove that this region has some potential for CBM gas exploration.But on the other hand,in some parts of this region,gas content in coal beds is rather low for the lack of the supplement of biogas in the later period.Therefore,this paper presents the following orientation of CBM gas exploration in this region.The CBM gas-rich area is featured by abnormal paleotemperature,high-rank coal,and good preservation conditions; especially a rather big value of CBM gas exploration exists in the northern part of this region because a large quantity of microorganisms may survive from such adverse environment as of oxygen deficiency,low salinity,and low temperature,and metabolize methane,normal alkane,and some other organic matter,playing an role of supplement for gas content in coal beds in this area.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2010年第11期17-21,共5页
Natural Gas Industry
基金
国家科技重大专项子课题"低煤阶煤层气富集规律与有利区块预测"(编号:2008ZX05000-033-02)
关键词
河西走廊
潮水盆地
红沙岗地区
煤层气
低煤阶
长焰煤
含气量
生物气
富集区
Chaoshui Basin,Hexi Corridor,Hongshagang area,coalbed methane,low-rank coal,long flame coal,gas content,biogas,enrichment region
