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首页> 外文期刊>E3S Web of Conferences >Geochemical characteristics and genesis of coalbed methane in Baode area on the eastern margin of Ordos Basin
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Geochemical characteristics and genesis of coalbed methane in Baode area on the eastern margin of Ordos Basin

机译：鄂尔多斯盆地东边缘煤层气煤层气的地球化学特征及成因

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The degree of coalbed methane exploration and development now in Baode area is relatively low. The lack of systematic understanding of the formation of coalbed methane in this area restricts the further exploration and development of coalbed methane. Based on the comprehensive study on the geochemical characteristics of coalbed methane components, hydrocarbon isotopes, water quality detection and hydrogen oxygen isotopes in coal seam in Baode area, the origin of coalbed methane in this area is discussed. According to the research, the hydrocarbon gas in the composition of coalbed methane in Baode area is mainly CH4 and a small amount of ethane. Both of their drying coefficients are more than 0.99, so they belong to the extremely dry coal bed methane. The value of δ~(13)C(CH4) coalbed methane is on the low side and the value of δ~(13)C(CO2) is on the high side, the mean value of δD(CH4) is -247.5‰, which shows the characteristics of terrestrial biogas. The water produced by coal seam is weak alkaline and belongs to the NaHCO3 type of water. which is similar to the surface water ion composition, salinity , δD(H2O) and δ~(18)O(H2O) values, indicating that the hydrodynamic conditions of the coal seam in this area are more active. There is a recharge of external water, which is benificial to the mass reproduction of CH4 producing bacteria and the formation of biogas. In this area, the coalbed methane is a mixture of thermogenic and biological genesis, mainly composed of thermogenic gases and supplemented by biogenic gases generated through carbon dioxide reduction.
机译：煤层气勘探和现在在Baode地区的发展程度相对较低。缺乏对该地区煤层气形成的制度理解限制了煤层气的进一步探索和发展。基于煤层甲烷组分的地球化学特性的综合研究，讨论了该地区煤层中煤层煤层中的煤层，水质检测和氢同位素。根据该研究，Baode面积煤层气组合物中的烃类气体主要是CH4和少量乙烷。它们的干燥系数都大于0.99，因此它们属于极端干燥的煤层甲烷。 δ〜（13）C（CH4）煤层甲烷的值在低侧，δ〜（13）C（CO2）的值在高端，平均值ΔD（CH4）为-247.5‰ ，显示陆地沼气的特征。煤层产生的水是弱碱性的，属于NaHCO 3类型的水。这类似于表面水离子组合物，盐度，ΔD（H2O）和δ〜（18）o（H2O）值，表明该区域中煤层的流体动力学条件更活跃。外水充电，始终高于CH4产生细菌的质量繁殖和沼气的形成。在该地区，煤层甲烷是热生成和生物学创世纪的混合物，主要由热气体组成，并通过通过二氧化碳减少产生的生物气体补充。

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