Study on Chemical Genesis of Deep Geothermal Fluid in Gaoyang Geothermal Field

Abstract

Geothermal resources are clean energy with a great potential for development and utilization. Gaoyang geothermal field, located in the middle of the raised area in Hebei province, China, is one of the three major geothermal fields in the Xiong’an New Area. With the development of the Xiong’an New Area, this geothermal field has become a research hotspot. According to the latest survey, the bottom-hole temperature of the D34 and D35 areas in the north of Gaoyang geothermal field is 149°C and 116°C, respectively, which indicates favorable target areas for geothermal exploitation The circulation mechanism and chemical origins of geothermal fluid are unclear in the Gaoyang geothermal field, which hinders the evaluation of geothermal resources in this region. Therefore, water chemistry and isotopic studies were performed on the Gaoyang geothermal fluid to understand the genesis of the Gaoyang geothermal field. Piper trigram and Na-K-Mg software were also used to explore the genesis of the underground hot water. Combined with stratigraphy and geothermal geology, it can be concluded that the primary hydrochemical type of the Gaoyang geothermal field is Na-HCO3·Cl. In the process of upward migration of geothermal water, leaching and cation alternating adsorption took place, and finally, high TDS geothermal water was formed. Our results are helpful for geothermal resource evaluation and utilization and provide scientific guidance for the sustainable development of geothermal resources.

Geological controls on the geothermal system and hydrogeochemistry of the deep low-salinity Upper Cretaceous aquifers in the Zharkent (eastern Ily) Basin, south-eastern Kazakhstan

“…The source of Na and Si is commonly attributed to sodium feldspar and/or rhyolite hydrolysis by hydrogen ions donated by bicarbonate dissociation (Sharp and Tranter, 2017;Absametov et al, 2023). Such silicate dissolution is also documented elsewhere in hydrothermal systems (Shoedarto et al, 2022;Xing et al, 2022). Shoedarto et al (2022) showed silicate weathering dominates water-rock interaction in hot springs in Southern Bandung, West Java, Indonesia.…”

Hydrochemical Characteristics and Indication to Geothermal Genesis of Low–Medium-Temperature Convection Geothermal Field in Yanshan Orogenic Basin, China

“…The hydrogen and oxygen isotope characteristics of groundwater can be used to judge the origin of groundwater, determine the recharge conditions of groundwater, the relationship between atmospheric precipitation and surface water and groundwater, and understand the circulation path of groundwater [22,[31][32][33]. The mean δ 2 H vsmow values of low-, medium-and high-temperature groundwater in the region showed a decreasing trend: −77.39 ± 1.05‰ > −83.06 ± 0.86‰ > −86.99 ± 0.8‰.…”

“…Studies on the distribution of environmental isotopes and hydrochemistry, including 14 C, can clarify key geothermal cycle information such as residence time and circulation depth of conductive geothermal fluids in subsidence basins in the Gansu region [20]. In addition, various temperature scale calculations and scaling corrosion studies of geothermal water can evaluate the amount of geothermal resources and their availability in the region [21,22]. These previous works provide a research basis for exploring the geochemical origin of geothermal fluids, evaluating the quality of geothermal and related mineral resources, the thermodynamic activities and internal rheology of the relevant Earth's crust.…”

Karst thermal reservoir tracer test and seepage characteristics analysis in Niutuozhen geothermal field in Xiong’an New Area

“…At the same time, magmatic activity is intense and accompanied by hydrothermal dissolution. The supergenetic karst formed at this time is the most conducive to reservoir construction, and the karst types mainly include weathering karst zone, fault karst zone and bedding karst zone (Xing et al, 2022).…”