Tho Gudui geothermal field records the highest temperature at equivalent borehole depths among the lainland hydrothermal systems in China's Mainland.Located about 150 km southeast of Lhasa City,the capital of Tibe...Tho Gudui geothermal field records the highest temperature at equivalent borehole depths among the lainland hydrothermal systems in China's Mainland.Located about 150 km southeast of Lhasa City,the capital of Tibet,the Gudui geothermal field belongs to the Sangri-Cuona rift belt,also known as the Sangri-Cuona geothermal belt,and is representative of the non-volcanic geothermal systems in the Himalayas.In this study,oxygen-18 and deuterium isotope compositions as well as 87Sr/86Sr ratios of water samples collected from the Gudui geothermal field were characterized to understand the origin and mixing processes of the geothermal fluids at Gudui.Hydrogen and oxygen isotope plots show both,deep and shallow reservoirs in the Gudui geothermal field.Deep geothermal fluids are the mixing product of magmatic and infiltrating snow-melt water.Calculations show that the magma fluid component of the deep geothermal fluids account for about 21.10%-24.04%;magma fluids lay also be a contributing source of lithium.The linear relationship of the 87Sr/86Sr isotopic ratio versus the 1/Sr plot indicates that shallow geothermal fluids form from the mixing of deep geothermal fluids with cold groundwater.Using a binary mixing model with deep geothermal fluid and cold groundwater as two end-members,the nixing ratios of the latter in most surface hot springs samples were calculated to be between 5% and 10%.Combined with basic geological characteristics,hydrogen and oxygen isotope characteristics,strontium concentration,87Sr/(86)Sr ratios,and the binary mixing model,we infer the 6 th-Class Reservoirs Evolution Conceptual Model(6-CRECM) for the Gudui geothermal system.This model represents an idealized summary of the characteristics of the Gudui geothermal field based on our comprehensive understanding of the origin and mixing processes of the geothermal fluid in Gudui.This study may aid in identifying the geothermal and geochemical origin of the Gudui high-temperature hydrothermal systems in remote Tibet of China,whose potential for geothermal development and utilization is enormous and untapped.展开更多
The origin traceability of edible oil is an effective way to protect the legitimate rights and interests of producers and consumers.This review briefly summarizes research progress on origin traceability technologies ...The origin traceability of edible oil is an effective way to protect the legitimate rights and interests of producers and consumers.This review briefly summarizes research progress on origin traceability technologies for edible oils including stable isotope ratio mass spectrometry,mineral element fingerprint analysis,organic component fingerprint analysis,near-infrared spectroscopy,nuclear magnetic resonance technology and biochemical analysis.Moreover,the development trends in edible oil origin traceability technology were proposed.展开更多
In this work,the factors affecting asphaltenes deposition in high-temperature and high-pressure wells were studied using backscattered light and PVT equipment customized to suit the well conditions.In an examination o...In this work,the factors affecting asphaltenes deposition in high-temperature and high-pressure wells were studied using backscattered light and PVT equipment customized to suit the well conditions.In an examination of the intensity of backscattered light,it was revealed that there exists a linear relationship between temperature and asphaltene precipitation within a specific temperature range.Within this range,a decrease in temperature tends to accelerate asphaltene precipitation.However,the impacts of pressure and gas-oil ratio are more pronounced.The pressure depletion induces the asphaltenes to precipitate out of the solution,followed by the formation of flocs below the bubble point.In addition,an increase in the gas-oil ratio causes a more severe asphaltene deposition,shifting the location of asphaltenes to deep well sections.展开更多
建立了一种利用气相色谱-燃烧-同位素质谱（Gas chromatography-combustion-Isotope ratio mass spectrometers,GC-C-IRMS）测定葡萄酒中5种挥发性组分（即乙醇、丙三醇、乙酸、乳酸乙酯、2-甲基-丁醇）碳稳定同位素比值新方法。优化了G...建立了一种利用气相色谱-燃烧-同位素质谱（Gas chromatography-combustion-Isotope ratio mass spectrometers,GC-C-IRMS）测定葡萄酒中5种挥发性组分（即乙醇、丙三醇、乙酸、乳酸乙酯、2-甲基-丁醇）碳稳定同位素比值新方法。优化了GC-C-IRMS测定条件,进样量小于0.5μL,样品分析时间小于14 min。对以上5种挥发性成分标准品的测定精密度为0.08‰-0.25‰,葡萄酒样品的测定精密度为0.09‰-0.36‰,与元素分析-同位素比率质谱仪（Element analyzer-isotope ratio mass spectrometers,EA-IRMS）比较,其测定偏差低于0.5‰。利用该技术分析了产自法国、澳大利亚、美国和中国共54支葡萄酒中5种挥发性组分的碳稳定同位素值并进行产地溯源分析,判别分析（Discriminant analysis,DA）结果表明,仅利用以上5种挥发性组分的碳同位素比值就能有效区分以上4个产地的葡萄酒,说明葡萄酒挥发性成分稳定碳同位素可应用于葡萄酒的产地溯源。展开更多
基金This work was financially supported by the China Geological Survey(Grant No.DD20160054)the National Natural Science Foundation of China(Grant No.U1407207)the National Key Research and Development Program of China(Grant No.2017YFC0602802).
文摘Tho Gudui geothermal field records the highest temperature at equivalent borehole depths among the lainland hydrothermal systems in China's Mainland.Located about 150 km southeast of Lhasa City,the capital of Tibet,the Gudui geothermal field belongs to the Sangri-Cuona rift belt,also known as the Sangri-Cuona geothermal belt,and is representative of the non-volcanic geothermal systems in the Himalayas.In this study,oxygen-18 and deuterium isotope compositions as well as 87Sr/86Sr ratios of water samples collected from the Gudui geothermal field were characterized to understand the origin and mixing processes of the geothermal fluids at Gudui.Hydrogen and oxygen isotope plots show both,deep and shallow reservoirs in the Gudui geothermal field.Deep geothermal fluids are the mixing product of magmatic and infiltrating snow-melt water.Calculations show that the magma fluid component of the deep geothermal fluids account for about 21.10%-24.04%;magma fluids lay also be a contributing source of lithium.The linear relationship of the 87Sr/86Sr isotopic ratio versus the 1/Sr plot indicates that shallow geothermal fluids form from the mixing of deep geothermal fluids with cold groundwater.Using a binary mixing model with deep geothermal fluid and cold groundwater as two end-members,the nixing ratios of the latter in most surface hot springs samples were calculated to be between 5% and 10%.Combined with basic geological characteristics,hydrogen and oxygen isotope characteristics,strontium concentration,87Sr/(86)Sr ratios,and the binary mixing model,we infer the 6 th-Class Reservoirs Evolution Conceptual Model(6-CRECM) for the Gudui geothermal system.This model represents an idealized summary of the characteristics of the Gudui geothermal field based on our comprehensive understanding of the origin and mixing processes of the geothermal fluid in Gudui.This study may aid in identifying the geothermal and geochemical origin of the Gudui high-temperature hydrothermal systems in remote Tibet of China,whose potential for geothermal development and utilization is enormous and untapped.
基金This work was supported by the National Nature Foundation Committee of P.R.China(31871886,31671858)the earmarked fund for China Agriculture research system(CARS-12)+2 种基金the Hunan Provincial Natural Science Foundation of China(2019JJ40114)the Scientific Research Fund of Hunan Provincial Education Department,China(18A108)the Major Research plan of the Changsha(kq1801016).
文摘The origin traceability of edible oil is an effective way to protect the legitimate rights and interests of producers and consumers.This review briefly summarizes research progress on origin traceability technologies for edible oils including stable isotope ratio mass spectrometry,mineral element fingerprint analysis,organic component fingerprint analysis,near-infrared spectroscopy,nuclear magnetic resonance technology and biochemical analysis.Moreover,the development trends in edible oil origin traceability technology were proposed.
基金This work was supported by the National Natural Science Foundation of China(No.52174047)the China Scholarship Council(No.202106440102)the PetroChina Strategic Cooperation Science and Technology Project(No.ZLZX 2020-01).
文摘In this work,the factors affecting asphaltenes deposition in high-temperature and high-pressure wells were studied using backscattered light and PVT equipment customized to suit the well conditions.In an examination of the intensity of backscattered light,it was revealed that there exists a linear relationship between temperature and asphaltene precipitation within a specific temperature range.Within this range,a decrease in temperature tends to accelerate asphaltene precipitation.However,the impacts of pressure and gas-oil ratio are more pronounced.The pressure depletion induces the asphaltenes to precipitate out of the solution,followed by the formation of flocs below the bubble point.In addition,an increase in the gas-oil ratio causes a more severe asphaltene deposition,shifting the location of asphaltenes to deep well sections.
文摘建立了一种利用气相色谱-燃烧-同位素质谱（Gas chromatography-combustion-Isotope ratio mass spectrometers,GC-C-IRMS）测定葡萄酒中5种挥发性组分（即乙醇、丙三醇、乙酸、乳酸乙酯、2-甲基-丁醇）碳稳定同位素比值新方法。优化了GC-C-IRMS测定条件,进样量小于0.5μL,样品分析时间小于14 min。对以上5种挥发性成分标准品的测定精密度为0.08‰-0.25‰,葡萄酒样品的测定精密度为0.09‰-0.36‰,与元素分析-同位素比率质谱仪（Element analyzer-isotope ratio mass spectrometers,EA-IRMS）比较,其测定偏差低于0.5‰。利用该技术分析了产自法国、澳大利亚、美国和中国共54支葡萄酒中5种挥发性组分的碳稳定同位素值并进行产地溯源分析,判别分析（Discriminant analysis,DA）结果表明,仅利用以上5种挥发性组分的碳同位素比值就能有效区分以上4个产地的葡萄酒,说明葡萄酒挥发性成分稳定碳同位素可应用于葡萄酒的产地溯源。
