Numerical Thermohydraulic Modeling of Deep Groundwater Circulation in Crystalline Basement: An Example of Calibration

2013 ◽  
pp. 65-74 ◽  
Author(s):  
Jean-Claude Griesser ◽  
Ladislaus Rybach
Keyword(s):  
Crystalline Basement ◽  
Deep Groundwater ◽  
Groundwater Circulation

scholarly journals Chemical composition of groundwaters in the Hornsund region, southern Spitsbergen

2012 ◽  
Vol 44 (1) ◽  
pp. 117-130 ◽  
Author(s):  
Tomasz Olichwer ◽  
Robert Tarka ◽  
Magdalena Modelska
Keyword(s):  
Chemical Composition ◽  
Ion Exchange ◽  
Shallow Groundwater ◽  
Mineralogical Composition ◽  
Deep Groundwater ◽  
Exchange Processes ◽  
Groundwater Circulation ◽  
Initial Chemical Composition ◽  
The University ◽  
Intermediate System

Chemical composition of groundwaters was investigated in the region of the Hornsund fjord (southern Spitsbergen). The investigations were conducted during polar expeditions organized by the University of Wroclaw in two summer seasons of 2003 and 2006. Three zones of groundwater circulation: suprapermafrost, intrapermafrost and subpermafrost, were identified in areas of perennial permafrost in the region of Hornsund. The zone of shallow circulation occurs in non-glaciated (suprapermafrost) and subglacial areas. In this zone, the chemical composition of groundwater originates from initial chemical composition of precipitation, mineralogical composition of bedrock, oxidation of sulphides and dissolution of carbonates. The intermediate system of circulation is connected with water flow inside and below perennial permafrost (intrapermafrost and subpermafrost). In this zone, the chemical composition of groundwater is mainly controlled by dissolution of carbonates, ion exchange processes involving Ca2+ substitution by Na+, and oxidation of sulphides under oxygen-depleted conditions. The subpermafrost zone (deep groundwater circulation) occurs in deep-tectonic fractures, which are likely conduits for the descent of shallow groundwater to deeper depths. In this zone, the groundwater shows lower mineralization comparing to intrapermafrost zone and has a multi-ion nature Cl–HCO3–Na-Ca–Mg.

scholarly journals Fault-Affected Fluid Circulation Revealed by Hydrochemistry and Isotopes in a Large-Scale Utilized Geothermal Reservoir

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yanlong Kong ◽  
Zhonghe Pang ◽  
Jumei Pang ◽  
Jie Li ◽  
Min Lyu ◽  
...  
Keyword(s):  
Large Scale ◽  
North China ◽  
Regional Scale ◽  
Groundwater Temperature ◽  
Deep Groundwater ◽  
Geothermal Resources ◽  
Spatial Trend ◽  
Thermal Fluids ◽  
Groundwater Circulation ◽  
Borehole Temperature

A new significant aspect in the utilization of hydrothermal energy in China is the large-scale exploitation using multiwells from a single geothermal site. This requires detailed hydrogeochemical investigations to gain insight about deep groundwater circulation. At the Xiongxian karst geothermal site in North China, where the demonstration project of large-scale utilization was conducted, 40 boreholes with depths from 1000 to 1800 m were drilled in a region of 50 km2. A total of 25 water samples were collected, and temperature loggings were conducted in 16 of these wells. At the site scale, the hydraulic head was observed to decline from SW to NE, i.e., orthogonal to that at the regional scale. Moreover, the geothermal groundwater temperature, borehole temperature gradient, and heat flow in the caprock all exhibited the same spatial trend with the groundwater head. Based on the hydrogeochemical and temperature logging data, this was explained by mixing of lateral recharging groundwater with ascending thermal fluids through the Xiongxian Fault, after excluding the causes of pumping activities and geologic structure. In addition, geothermal groundwater 81Kr age was estimated to be approximately 760 k yr, which is much older than the 14C age of 20 to 30 k yr. The older 81Kr age implies a low renewability of deep groundwater circulation, which should be considered in terms of sustainable management in relation to the large-scale utilization of geothermal resources.

Deep groundwater circulation and associated methane leakage in the northern Canadian Rocky Mountains

2016 ◽  
Vol 68 ◽  
pp. 10-18 ◽  
Author(s):  
S.E. Grasby ◽  
G. Ferguson ◽  
A. Brady ◽  
C. Sharp ◽  
P. Dunfield ◽  
...  
Keyword(s):  
Rocky Mountains ◽  
Canadian Rocky Mountains ◽  
Deep Groundwater ◽  
Methane Leakage ◽  
Groundwater Circulation

scholarly journals Deep Groundwater Circulation through Gas Shales in Mountain Belts

2017 ◽  
Vol 17 ◽  
pp. 532-533 ◽  
Author(s):  
Stephen Grasby ◽  
Grant Ferguson ◽  
Alyson Brady ◽  
Christine Sharp ◽  
Peter Dunfield ◽  
...  
Keyword(s):  
Deep Groundwater ◽  
Groundwater Circulation ◽  
Gas Shales ◽  
Mountain Belts

scholarly journals Environmental Isotope Study (14C, 13C, 18O, D, Noble Gases) on Deep Groundwater Circulation Systems in Hungary With Reference to Paleoclimate

Radiocarbon ◽  
1989 ◽  
Vol 31 (03) ◽  
pp. 902-918 ◽  
Author(s):  
Martin Stute ◽  
Jozsef Deak
Keyword(s):  
Cross Sections ◽  
Isotope Ratio ◽  
Noble Gases ◽  
Environmental Isotopes ◽  
Carbonate Dissolution ◽  
Deep Groundwater ◽  
Α Decay ◽  
Groundwater Circulation ◽  
Groundwater Samples ◽  
Isotope Study

We have studied environmental isotopes and noble gases in groundwater samples from various locations in the Great Hungarian Plain along two selected hydrogeological cross-sections of ca 100km. The 14C groundwater ages were corrected hydrochemically and compared with age information derived from excess helium due to 4He from α-decay of U and Th and their daughter nuclides within the aquifer and to He accumulation from the crustal (and mantle) He flux. In correcting the 14C groundwater ages, we considered carbonate dissolution under open and closed system conditions in the infiltration areas. Non-radioactive reduction of the 14C/12C isotope ratio also plays an important role due to the addition of “dead” carbon species to groundwater along its subsurface pathway. High (corrected) 14C ages, which fall into the last global cold period, are supported by significantly lower heavy stable isotope values as well as lower temperatures derived from the noble gases Ne, Ar, Kr and Xe.

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