The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Ruth Esther Villanuevaestrada - One of the best experts on this subject based on the ideXlab platform.
-
inter laboratory test for oxygen and hydrogen stable isotope analyses of Geothermal Fluids assessment of reservoir Fluid compositions
Rapid Communications in Mass Spectrometry, 2018Co-Authors: Mahendra P Verma, Robert Van Geldern, Johannes A C Barth, Gael Monvoisin, Karyne M Rogers, Fausto Grassa, Daniel Carrizo, Antonio Delgado Huertas, Thomas Kretzschmar, Ruth Esther VillanuevaestradaAbstract:RATIONALE: Knowledge of the accuracy and precision for oxygen (δ18 O values) and hydrogen (δ2 H values) stable isotope analyses of Geothermal Fluid samples is important to understand Geothermal reservoir processes, such as partial boiling-condensation and encroachment of cold and reinjected waters. The challenging aspects of the analytical techniques for this specific matrix include memory effects and higher scatter of delta values with increasing total dissolved solids (TDS) concentrations, deterioration of Pt-catalysts by dissolved/gaseous H2 S for hydrogen isotope equilibration measurements and isotope salt effects that offset isotope ratios determined by gas equilibration techniques. METHODS: An inter-laboratory comparison exercise for the determination of the δ18 O and δ2 H values of nine Geothermal Fluid samples was conducted among eleven laboratories from eight countries (CeMIEGeo2017). The delta values were measured by dual inlet isotope ratio mass spectrometry (DI-IRMS), continuous flow IRMS (CF-IRMS) and/or laser absorption spectroscopy (LAS). Moreover, five of these laboratories analyzed an additional sample set at least one month after the analysis period of the first set. Statistical evaluation of all the results was performed to obtain the expected isotope ratios of each sample, which were then subsequently used in deep reservoir Fluid composition calculations. RESULTS: The overall analytical precisions of the measurements were ± 0.2‰ for δ18 O values and ± 2.0‰ for δ2 H values within the 95% confidence interval. CONCLUSIONS: The measured and calculated δ18 O and δ2 H values of water sampled at the weir box, separator and wellhead of Geothermal wells suggest the existence of hydrogen and oxygen isotope-exchange equilibrium between the liquid and vapor phases at all sampling points in the well. Thus, both procedures for calculating the isotopic compositions of the deep Geothermal reservoir Fluid - using either the analytical data of the liquid phase at the weir box together with those of vapor at the separator or the analytical data of liquid and vapor phases at the separator -are equally valid.
Yingchun Wang - One of the best experts on this subject based on the ideXlab platform.
-
Fluid geochemistry of the cuopu high temperature Geothermal system in the eastern himalayan syntaxis with implication on its genesis
Applied Geochemistry, 2019Co-Authors: Jiao Tian, Zhonghe Pang, Yingchun WangAbstract:Abstract High-temperature Geothermal Fluids dissolve constituents pertinent to water-rock interaction and magmatic volatile absorption, resulting in high total dissolved solid (TDS) values. However, this study focuses on the hydrochemical evolution of the low-salinity HCO3–Na type high-temperature Geothermal Fluid in Cuopu, eastern Himalayas. The Geothermal water is recharged by local precipitation and glacier water from surrounding mountains. The TDS values are below 834 mg/L and the constituents are mainly products of the water-carbon dioxide-rock interactions lacking magmatic volatile dissolved in the Fluid. The Geothermal water reaches an almost complete chemical equilibrium with the feldspar or plagioclase-enriched reservoir rock in a reducing condition. The reservoir temperature is between 175 °C–200 °C, while the temperature could reach up to 400 °C in the deep crustas indicated by the carbon isotopic exchange equilibrium between CO2 and CH4. The infiltrated glacier water was heated during its circulation within the hot thickened crust and continued dissolving the crustal metamorphic gas, such as radiogenic helium and limestone metamorphic CO2, until the junction of the two sets of faults provided an ascending channel for it. Upon rising along the conduit, the Geothermal water mixed with cold groundwater to different degrees. Approximately 0.015 mol/L CO2 escaped from the Geothermal Fluid when it scattered as bubbling hot springs on the surface of the anisotropic porous Quaternary sediments. Such kind ofhydrochemical evolution of lowsalinity alkaline HCO3–Na type water represents a typical formation mechanism of the high-temperature Geothermal systems along the Himalayas.
Mustafa Afsin - One of the best experts on this subject based on the ideXlab platform.
-
Assessment of stream water chemistry and impact of Geothermal Fluid in the up-Buyuk Menderes Basin, Turkey
Environmental Science and Pollution Research, 2017Co-Authors: Aysen Davraz, Fatma Aksever, Mustafa AfsinAbstract:The discharge of Geothermal Fluid into the natural water environment may lead to serious damages. In this study, the impact of Geothermal waste water on surface water has been investigated in the up-Buyuk Menderes River, Turkey. Thermal return water from district heating and from thermal bath in the Sandıklı region were the most important source of major solutes and trace elements to the up-Buyuk Menderes River and tributaries. The thermal contribution causes a drastic increase in Na, SO_4 ions, EC, and temperature of surface waters. The concentrations of As, Al, B, Fe, Cr, Li, S, P, Pb, U, Mn, and Zn are increasing dramatically downstream of thermal water inputs in the Kufi Creek tributary. In addition to natural thermal water inputs, water quality was impacted by anthropogenic trace and major element inputs from surface waters. The increased of some trace elements (Al, As, B, Cu, Cd, Fe, Mn, P, U) in surface water are related to anthropogenic activities such as agricultural activities, sewage effluents, and stockyards in the study area. Additionally, surface water quality of the up-Buyuk Menderes River and tributaries was evaluated according to standards given by the Environmental Protection Agency of both Turkey and USA. Our study demonstrates the influence of thermal water inputs on water quality of surface waters.
Mahendra P Verma - One of the best experts on this subject based on the ideXlab platform.
-
inter laboratory test for oxygen and hydrogen stable isotope analyses of Geothermal Fluids assessment of reservoir Fluid compositions
Rapid Communications in Mass Spectrometry, 2018Co-Authors: Mahendra P Verma, Robert Van Geldern, Johannes A C Barth, Gael Monvoisin, Karyne M Rogers, Fausto Grassa, Daniel Carrizo, Antonio Delgado Huertas, Thomas Kretzschmar, Ruth Esther VillanuevaestradaAbstract:RATIONALE: Knowledge of the accuracy and precision for oxygen (δ18 O values) and hydrogen (δ2 H values) stable isotope analyses of Geothermal Fluid samples is important to understand Geothermal reservoir processes, such as partial boiling-condensation and encroachment of cold and reinjected waters. The challenging aspects of the analytical techniques for this specific matrix include memory effects and higher scatter of delta values with increasing total dissolved solids (TDS) concentrations, deterioration of Pt-catalysts by dissolved/gaseous H2 S for hydrogen isotope equilibration measurements and isotope salt effects that offset isotope ratios determined by gas equilibration techniques. METHODS: An inter-laboratory comparison exercise for the determination of the δ18 O and δ2 H values of nine Geothermal Fluid samples was conducted among eleven laboratories from eight countries (CeMIEGeo2017). The delta values were measured by dual inlet isotope ratio mass spectrometry (DI-IRMS), continuous flow IRMS (CF-IRMS) and/or laser absorption spectroscopy (LAS). Moreover, five of these laboratories analyzed an additional sample set at least one month after the analysis period of the first set. Statistical evaluation of all the results was performed to obtain the expected isotope ratios of each sample, which were then subsequently used in deep reservoir Fluid composition calculations. RESULTS: The overall analytical precisions of the measurements were ± 0.2‰ for δ18 O values and ± 2.0‰ for δ2 H values within the 95% confidence interval. CONCLUSIONS: The measured and calculated δ18 O and δ2 H values of water sampled at the weir box, separator and wellhead of Geothermal wells suggest the existence of hydrogen and oxygen isotope-exchange equilibrium between the liquid and vapor phases at all sampling points in the well. Thus, both procedures for calculating the isotopic compositions of the deep Geothermal reservoir Fluid - using either the analytical data of the liquid phase at the weir box together with those of vapor at the separator or the analytical data of liquid and vapor phases at the separator -are equally valid.
Jiao Tian - One of the best experts on this subject based on the ideXlab platform.
-
Fluid geochemistry of the cuopu high temperature Geothermal system in the eastern himalayan syntaxis with implication on its genesis
Applied Geochemistry, 2019Co-Authors: Jiao Tian, Zhonghe Pang, Yingchun WangAbstract:Abstract High-temperature Geothermal Fluids dissolve constituents pertinent to water-rock interaction and magmatic volatile absorption, resulting in high total dissolved solid (TDS) values. However, this study focuses on the hydrochemical evolution of the low-salinity HCO3–Na type high-temperature Geothermal Fluid in Cuopu, eastern Himalayas. The Geothermal water is recharged by local precipitation and glacier water from surrounding mountains. The TDS values are below 834 mg/L and the constituents are mainly products of the water-carbon dioxide-rock interactions lacking magmatic volatile dissolved in the Fluid. The Geothermal water reaches an almost complete chemical equilibrium with the feldspar or plagioclase-enriched reservoir rock in a reducing condition. The reservoir temperature is between 175 °C–200 °C, while the temperature could reach up to 400 °C in the deep crustas indicated by the carbon isotopic exchange equilibrium between CO2 and CH4. The infiltrated glacier water was heated during its circulation within the hot thickened crust and continued dissolving the crustal metamorphic gas, such as radiogenic helium and limestone metamorphic CO2, until the junction of the two sets of faults provided an ascending channel for it. Upon rising along the conduit, the Geothermal water mixed with cold groundwater to different degrees. Approximately 0.015 mol/L CO2 escaped from the Geothermal Fluid when it scattered as bubbling hot springs on the surface of the anisotropic porous Quaternary sediments. Such kind ofhydrochemical evolution of lowsalinity alkaline HCO3–Na type water represents a typical formation mechanism of the high-temperature Geothermal systems along the Himalayas.