title: The origin of high hydrocarbon groundwater in shallow Triassic aquifer in Northwest Guizhou, China.
abstract: 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 (T2g3) and upper of Yongningzhen formation (T1yn4). 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.
authors.affiliation: Sate Key Laboratory of Biogeology and Environmental Geology, Wuhan, 430074, China.|School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.
authors.forename: Shan
authors.identifier: http://orcid.org/0000-0002-0055-1991
authors.initials: S
authors.lastname: Liu
authors.affiliation: Sate Key Laboratory of Biogeology and Environmental Geology, Wuhan, 430074, China. shihuaqi@cug.edu.cn.|School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China. shihuaqi@cug.edu.cn.
authors.forename: Shihua
authors.initials: S
authors.lastname: Qi
authors.affiliation: Sate Key Laboratory of Biogeology and Environmental Geology, Wuhan, 430074, China.|School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Luo
authors.affiliation: Sate Key Laboratory of Biogeology and Environmental Geology, Wuhan, 430074, China.|School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.
authors.forename: Fangzhi
authors.initials: F
authors.lastname: Liu
authors.affiliation: Sate Key Laboratory of Biogeology and Environmental Geology, Wuhan, 430074, China.|School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Ding
authors.affiliation: Sate Key Laboratory of Biogeology and Environmental Geology, Wuhan, 430074, China.|School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.
authors.forename: Huanfang
authors.initials: H
authors.lastname: Huang
authors.affiliation: Sate Key Laboratory of Biogeology and Environmental Geology, Wuhan, 430074, China.|School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Sate Key Laboratory of Biogeology and Environmental Geology, Wuhan, 430074, China.|School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.
authors.forename: Shenggao
authors.initials: S
authors.lastname: Cheng
mesh_terms: D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D005844:Geology; D060587:Groundwater / Q000737:chemistry*; D006838:Hydrocarbons / Q000032:analysis*; D010578:Petroleum / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D006838:Hydrocarbons; D010578:Petroleum; D014874:Water Pollutants, Chemical
keywords: Biomarkers; Original high hydrocarbon groundwater; Shallow Triassic aquifer; Water–rock–hydrocarbon interaction