کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8852836 1618780 2018 32 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Naphthenic acids in groundwater overlying undeveloped shale gas and tight oil reservoirs
ترجمه فارسی عنوان
اسیدهای نفتنیک در آب های زیرزمینی تحت پوشش گازهای شیل ناتمام و مخازن نفت تنگ قرار دارند
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی
The acid extractable organics (AEOs) containing naphthenic acids (NAs) in groundwater overlying undeveloped shale gas (Saint-Édouard region) and tight oil (Haldimand sector, Gaspé) reservoirs in Québec, Canada, were analysed using high resolution Orbitrap mass spectrometry and thermal conversion/elemental analysis - isotope ratio mass spectrometry. As classically defined by CnH2n+ZO2, the most abundant NAs detected in the majority of groundwater samples were straight-chain (Z = 0) or monounsaturated (Z = −2) C16 and C18 fatty acids. Several groundwater samples from both study areas, however, contained significant proportions of presumably alicyclic bicyclic NAs (i.e., Z = −4) in the C10-C18 range. These compounds may have originated from migrated waters containing a different distribution of NAs, or are the product of in situ microbial alteration of shale organic matter and petroleum. In most groundwater samples, intramolecular carbon isotope values generated by pyrolysis (δ13Cpyr) of AEOs were on average around 2-3‰ heavier than those generated by bulk combustion (δ13C) of AEOs, providing further support for microbial reworking of subsurface organic carbon. Although concentrations of AEOs were very low (<2.0 mg/L), the detection of potentially toxic bicyclic acids in groundwater overlying unconventional hydrocarbon reservoirs points to a natural background source of organic contaminants prior to any large-scale commercial hydrocarbon development.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 191, January 2018, Pages 664-672
نویسندگان
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