Variability of geochemical properties in a microbially dominated coalbed gas system from the eastern margin of the Illinois Basin, USA
Variability of geochemical properties in a microbially dominated coalbed gas system from the eastern margin of the Illinois Basin, USA
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DOI：
10.1016/j.coal.2008.02.002
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发表时间：
2008-10-02
影响因子：
5.6
通讯作者：
Hedges, Sheila
中科院分区：
文献类型：
--
作者：
Strapoc, Dariusz;Mastalerz, Maria;Hedges, Sheila
本研究概述了伊利诺斯盆地东南边缘的天然气特征，并评估了Seelyville和Springfield煤层的区域与局部天然气变化。我们的研究结果表明，印第安纳州这些煤的高渗透率和浅（100-250 m）深度允许产甲烷微生物群落接种，从而导致沿伊利诺斯盆地东部边缘广泛存在微生物甲烷生成。伊利诺斯盆地镜质组反射率r - 0接近0.6%的低成熟煤中含有大量的煤层气（3 m(3)/t, 96 scf/t）， >= 97 vol.%的微生物甲烷。在煤层中，无论是在垂直煤层段还是在不同位置的横向上，煤层气的含量都有很大的变化。因此，为了准确估计煤层气储量，需要对整个岩心剖面进行采样。(C) 2008 Elsevier B.V.版权所有
This study outlines gas characteristics along the southeastern margins of the Illinois Basin and evaluates regional versus local gas variations in Seelyville and Springfield coal beds. Our findings suggest that high permeability and shallow (100-250 m) depths of these Indiana coals allowed inoculation with methanogenic microbial consortia, thus leading to widespread microbial methane generation along the eastern marginal part of the Illinois Basin. Low maturity coals in the Illinois Basin with a vitrinite reflectance R-o similar to 0.6% contain significant amounts of coal gas (similar to 3 m(3)/t, 96 scf/t) with >= 97 vol.% microbial methane. The amount of coal gas can vary significantly within a coal seam both in a vertical seam section as well as laterally from location to location. Therefore sampling of an entire core section is required for accurate estimates of coal gas reserves. (C) 2008 Elsevier B.V. All rights reserved.