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首页> 外文期刊>Environmental Science & Technology >Hydrocarbons in Upland Groundwater, Marcellus Shale Region, Northeastern Pennsylvania and Southern New York, U.S.A.
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Hydrocarbons in Upland Groundwater, Marcellus Shale Region, Northeastern Pennsylvania and Southern New York, U.S.A.

机译：美国马塞勒斯页岩地区，宾夕法尼亚州东北部和纽约南部地区的高地地下水中的碳氢化合物

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摘要

Water samples from 50 domestic wells located 1 km (proximal) and 1 km (distal) from shale-gas wells in upland areas of the Marcellus Shale region were analyzed for chemical, isotopic, and groundwater-age tracers. Uplands were targeted because natural mixing with brine and hydrocarbons from deep formations is less common in those areas compared to valleys. CH4-isotope, predrill CH4-concentration, and other data indicate that one proximal sample (5% of proximal samples) contains thermogenic CH4 (2.6 mg/L) from a relatively shallow source (Catskill/Lock Haven Formations) that appears to have been mobilized by shale-gas production activities. Another proximal sample contains five other volatile hydrocarbons (0.03-0.4 mu g/L), including benzene, more hydrocarbons than in any other sample. Modeled groundwater-age distributions, calibrated to H-3, SF6, and C-14 concentrations, indicate that water in that sample recharged prior to shale-gas development, suggesting that land-surface releases associated with shale-gas production were not the source of those hydrocarbons, although subsurface leakage from a nearby gas well directly into the groundwater cannot be ruled out. Age distributions in the samples span similar to 20 to 10000 years and have implications for relating occurrences of hydrocarbons in groundwater to land-surface releases associated with recent shale-gas production and for the time required to flush contaminants from the system.
机译：分析了Marcellus页岩地区高地地区距页岩气井不到1公里（近端）和距井1公里（远处）的50口家庭井中的水样，以进行化学，同位素和地下水年龄示踪剂分析。高地是针对性的，因为与山谷相比，在这些地区自然不易与盐水和深层地层的碳氢化合物混合。 CH4同位素，预钻CH4浓度和其他数据表明，一个近端样品（占近端样品的5％）含有来自相对较浅的来源（卡茨基尔/洛克黑文岩层）的产热CH4（2.6 mg / L）。由页岩气生产活动调动。另一个近端样品包含五种其他挥发性烃（0.03-0.4μg / L），其中包括苯，比其他任何样品都要多。根据H-3，SF6和C-14浓度校准的地下水年龄分布模型表明，在页岩气开发之前，该样品中的水已经补给，这表明与页岩气生产相关的地表释放不是源这些烃中，尽管不能排除从附近的气井直接地下泄漏到地下水中的情况。样品的年龄分布跨度接近20到> 10000年，对将地下水中碳氢化合物的发生与与近期页岩气生产相关的地表释放相关，以及从系统中清除污染物所需的时间产生了影响。

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