Fingerprinting coal-derived gases from the UK
Fingerprinting coal-derived gases from the UK
复制标题
对英国煤成气进行指纹识别
DOI：
10.1016/j.chemgeo.2017.09.016
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Györe D
中科院分区：
文献类型：
--
作者：
Györe D
美国大规模开采非常规碳氢化合物导致人们担心甲烷污染浅层地下水。区分开采过程中释放的深层天然气（页岩气、煤层气和煤炭地下气化）和天然浅源甲烷，对于监测和管理与开采过程有关的环境风险至关重要。在这里，第一次，我们提出了测量的主要气体，稳定和惰性气体的同位素组成的煤层气（煤层气）从苏格兰中部和煤矿甲烷（CMM）从英格兰中部，英国。分子组成（C1/（C2+ C3）= 21至121）和稳定同位素组成（δ 13 CCH 4 = − 39.5至− 51.1‰; δ DCH 4 = − 163至− 238‰）表明甲烷为热成因。它们与英国大多数浅源气体不同。这两个样品套房表现出高的他浓度（338至2980 ppmv），大大高于大气和地下水的水平。简单的建模表明，这些高4 He浓度不能仅仅来自于原位生产，因为煤沉积，因此，大多数是来自周围的地壳。苏格兰煤层气包含一个可分辨的地幔氦，氖和氩的贡献，可能源于地壳深部的熔体，证明英国煤作为一个存储的深层挥发分为10亿年。煤衍生气体中的高4 He有可能被用作一种新的诊断指纹，以跟踪英国未来非常规天然气开采作业中深层甲烷的逃逸释放。
The large-scale extraction of unconventional hydrocarbons in the United States has led to fears of methane contamination of shallow groundwaters. Differentiating between the deep gas released during extraction (shale gas, coal bed methane and underground coal gasification) and natural shallow-sourced methane is imperative for the monitoring and managing of environmental risks related to the extraction process. Here, for the first time, we present measurements of the major gas, and stable and noble gas isotope composition of coal bed methane (CBM) from central Scotland and coal mine methane (CMM) from central England, UK. The molecular (C1/ (C2+ C3) = 21 to 121) and stable isotope compositions (δ13CCH4= − 39.5 to − 51.1‰; δDCH4= − 163 to − 238‰) indicate a thermogenic origin for the methane. They are distinct from the majority of shallow-sourced gases in UK. Both sample suites exhibit high He concentrations (338 to 2980 ppmv) that are considerably above atmospheric and groundwater levels. Simple modelling shows that these high4He concentrations cannot be solely derived from in situ production since coal deposition, and hence the majority is derived from the surrounding crust. The Scottish CBM contains a resolvable mantle He, Ne and Ar contribution that may originate from melts in the deep crust, demonstrating the UK coals have acted as a store for deep volatiles for 10s of millions of years. The high4He in the coal-derived gases has the potential to be used as a novel diagnostic fingerprint to track fugitive release of deep methane from future unconventional gas extraction operations in the UK.
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影响因子：
2
作者：
Donnelly, T;Waldron, S;Bearhop, S
通讯作者：
Bearhop, S
影响因子：
5.3
作者：
BALLENTINE, CJ;ONIONS, RK;DEAK, J
通讯作者：
DEAK, J
影响因子：
64.8
作者：
Gilfillan, Stuart M. V.;Lollar, Barbara Sherwood;Ballentine, Chris J.
通讯作者：
Ballentine, Chris J.
影响因子：
5.3
作者：
T. Torgersen;B. Kennedy
通讯作者：
T. Torgersen;B. Kennedy
DOI：
10.1144/gsl.sp.1995.082.01.14
发表时间：
1995
期刊：
Geological Society, London, Special Publications
影响因子：
--
作者：
M. Allen
通讯作者：
M. Allen