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首页> 外文期刊>Journal of natural gas science and engineering >Stable isotope characteristics of CBM co-produced water and implications for CBM development: The example of the Shizhuangnan block in the southern Qinshui Basin, China
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Stable isotope characteristics of CBM co-produced water and implications for CBM development: The example of the Shizhuangnan block in the southern Qinshui Basin, China

机译：煤层气副产水的稳定同位素特征及其对煤层气开发的意义-以沁水盆地南部石庄南区块为例

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Coalbed methane (CBM) is a rapid growing industry in the Qinshui Basin, China. However, as a relatively new industry, few studies have examined the co-produced water from CBM in terms of either water quality or stable isotope composition. This study aims to determine the isotopic composition of coal mine roof water and CBM co-produced water, to correlate stable isotope characteristics of the co-produced water with gas and groundwater production and flow pathways, and to identify the origin- of the co-produced water of the Shizhuangnan CBM block in the southern Qinshui Basin. Stable isotope analyses were conducted on 58 water samples collected from three coal mines and 29 CBM wells. Well production data including gas and water production rates, and well liquid level were also collected. Ten additional sets of literature data were also used in the analyses from this area. The stable isotope analyses show that both coal seam roof water and CBM co-produced water are predominantly meteoric origin, with a trend towards lower isotopic composition where the aquifer is shallower. It was found that co-produced water samples with delta D and delta O-18 values above the local meteoric water line (LMWL) were associated with higher gas production, whereas those with delta D and delta O-18 values lower than the LMWL were associated with lower gas production. In addition, the co-produced water of highly productive gas wells has positive and relatively higher delta C-13-DIC (DIC, dissolved inorganic carbon) values, while water from wells with no gas production has negative delta C-13-DIC values. We propose that coal seam water is characterized by "D drift" above the LMWL in the plots of delta D vs. delta O-18 and positive delta C-13-DIC values. On the contrary, sandstone and limestone aquifer water is normally characterized by "O-18 drift" below the LMWL and negative delta C-13-DIC values. Therefore, the findings of this study will help to identify the origin of co-produced water, and guide CBM exploration and development. They can also be used in the management of CBM co-produced water. (C) 2015 Elsevier B.V. All rights reserved.
机译：煤层气（CBM）是中国沁水盆地快速发展的产业。但是，作为一个相对较新的行业，很少有研究从水质或稳定的同位素组成方面研究煤层气的联产水。这项研究旨在确定煤矿顶板水和煤层气联产水的同位素组成，将联产水的稳定同位素特征与天然气和地下水的生产和流动路径相关联，并确定联产的来源。沁水盆地南部石庄南煤层气区块的采出水。对从三个煤矿和29座煤层气井收集的58个水样进行了稳定的同位素分析。还收集了包括气和水生产率以及井液位的井产量数据。该领域的分析中还使用了十组其他文献数据。稳定的同位素分析表明，煤层顶板水和煤层气共同开采的水都主要是陨石成因的，并且在含水层较浅的地方，同位素组成趋于降低。结果发现，联合生产的水样品的δD和δO-18值高于局部流水线（LMWL）与较高的产气量有关，而δD和δO-18值低于LMWL的联合生产的水样则与较高的产气量有关。与降低天然气产量有关。此外，高产气井的副产水具有正的且相对较高的δC-13-DIC（DIC，溶解的无机碳）值，而没有气井的井中的水具有负的δC-13-DIC值。我们提出，煤层水的特征是在Delta D相对于Delta O-18和正Delta C-13-DIC值的曲线图中，LMWL上方的“ D漂移”。相反，砂岩和石灰岩含水层的水通常以低于LMWL的“ O-18漂移”和负C-13-DIC值为特征。因此，这项研究的结果将有助于识别联产水的来源，并指导煤层气的勘探和开发。它们也可以用于管理煤层气联合生产的水。 （C）2015 Elsevier B.V.保留所有权利。

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