Sate Key Laboratory of Biogeology and Environmental Geology, Wuhan, 430074, China.
School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.
Environ Geochem Health. 2018 Feb;40(1):415-433. doi: 10.1007/s10653-017-9923-8. Epub 2017 Feb 23.
Original high hydrocarbon groundwater represents a kind of groundwater in which hydrocarbon concentration exceeds 0.05 mg/L. The original high hydrocarbon will significantly reduce the environment capacity of hydrocarbon and lead environmental problems. For the past 5 years, we have carried out for a long-term monitoring of groundwater in shallow Triassic aquifer in Northwest Guizhou, China. We found the concentration of petroleum hydrocarbon was always above 0.05 mg/L. The low-level anthropogenic contamination cannot produce high hydrocarbon groundwater in the area. By using hydrocarbon potential, geochemistry and biomarker characteristic in rocks and shallow groundwater, we carried out a comprehensive study in Dalongjing (DLJ) groundwater system to determine the hydrocarbon source. We found a simplex hydrogeology setting, high-level water-rock-hydrocarbon interaction and obviously original hydrocarbon groundwater in DLJ system. The concentration of petroleum hydrocarbon in shallow aquifer was found to increase with the strong water-rock interaction. Higher hydrocarbon potential was found in the upper of Guanling formation (Tg) and upper of Yongningzhen formation (Tyn). Heavily saturated carbon was observed from shallow groundwater, which presented similar distribution to those from rocks, especially from the deeper groundwater. These results indicated that the high concentrations of original hydrocarbon in groundwater could be due to the hydrocarbon release from corrosion and extraction out of strata over time.
原始高碳氢地下水是指水中碳氢化合物浓度超过 0.05mg/L 的一种地下水。原始高碳氢会显著降低碳氢化合物的环境容量，引发环境问题。在过去的 5 年中，我们对中国贵州西北部浅层三叠系含水层中的地下水进行了长期监测。我们发现石油碳氢化合物的浓度始终高于 0.05mg/L。该地区的低水平人为污染不可能产生高碳氢地下水。通过利用岩石和浅层地下水中的碳氢潜力、地球化学和生物标志物特征，我们对大龙井（DLJ）地下水系统进行了综合研究，以确定烃源。我们发现该系统具有单一的水文地质条件、高水平的水-岩-烃相互作用和明显的原始碳氢地下水。浅层含水层中石油碳氢化合物的浓度随着水-岩相互作用的增强而增加。关岭组（Tg）上部和永宁镇组（Tyn）上部的碳氢潜力较高。从浅层地下水中观察到大量饱和的碳，其分布与岩石中的相似，特别是在更深的地下水中。这些结果表明，地下水中原始高浓度碳氢化合物可能是由于地层中碳氢化合物的腐蚀和随时间的提取释放所致。
