Thermophysical parameters and lithospheric thermal structure in Guide Basin, Northeast Qinghai–Tibet Plateau

Liu, Feng; Lang, Xujuan; Lu, Chuan; Lin, Wenjing; Tong, Jue; Wang, Guiling

doi:10.1007/s12665-017-6503-2

Cited by 9 publications

(9 citation statements)

References 24 publications

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“…The Zhacang geothermal field in the Guide Basin of northeastern Tibetan Plateau is a typical fault-controlled geothermal system. Magma in the depth of 20 to 40 km induced a terrestrial heat flow of 76.5 mW/m 2 in this region [6,7]. Active faults allow the surface water to flow deeply and, after heated, discharge as geothermal springs with temperature exceeds 90°C.…”

Section: Introductionmentioning

confidence: 95%

“…(a) Model domain of the conductive fault F2 and physical parameters, where land surface elevation extracted from digital elevation model, and the depth of F2 from the electromagnetic and gravity prospecting[19]; (b) irregular mesh generated by Gambit software (Fluent Inc.) with mesh refinement in the recharge and discharge zones; (c) boundary conditions for flow and heat in the fault F2 in the numerical model 6. Geofluids discharge area.…”

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confidence: 99%

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Numerical Modeling of Reactive Transport and Self-Sealing Processes in the Fault-Controlled Geothermal System of the Guide Basin, China

Hou

Feng

et al. 2019

Geofluids

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Strong chemical reactions in the geothermal systems may cause sealing of fractures, which reduces the permeability in the reservoir and subsequently affects the heat production. However, it is difficult to reveal the sealing range in a deeply buried reservoir based on a limited number of downhole logs. This study recreated the sealing processes of the fault-controlled geothermal system in the Guide Basin, China, by reactive transport modeling. The modeling domain was discretized based on multiple interacting continua (MINC) approach, to address the nonequilibrium heat transport processes between the matrix and conduit in the fractured fault damage zone. Once the model was validated by observations of major ions in spring water and downhole temperature logs in the discharge area, it was used to determine the coupled processes of fluid, heat, and chemical transport in the reservoir and the resultant sealing ranges. It was found that the dissolution of albite and K-feldspar leads to the precipitation of smectite-Ca and illite in the middle and bottom of the fault under the condition of high concentration of Ca2+ and Mg2+ in the recharge water. Calcite veins were formed in discharge zone, because the horizontal fast flow in shallow subsurface zone supplied abundant Ca2+ and HCO3-. As a consequence, the permeability in the discharge zone reduced by 15% when compared to the original permeability of 100 mD. Moreover, another three self-sealing areas were formed near the recharge zone, the deep upgradient zone, and the downgradient area where the fast upward fluid flow occurred. Self-sealing subsequently prevented the deep circulation of the flow and heat absorption, which tends to make the fault-controlled geothermal system inactive.

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Section: Introductionmentioning

confidence: 95%

mentioning

confidence: 99%

Numerical Modeling of Reactive Transport and Self-Sealing Processes in the Fault-Controlled Geothermal System of the Guide Basin, China

Hou

Feng

et al. 2019

Geofluids

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“…The Tuotuohe region is located within the hinterland of the Tibetan Plateau; is geologically within the northern Qiangtang Block [12]; and is bounded by the Jinshajiang suture belt to the north, the Tanggulashan Mountains Fault to the south, the line of 94 • 30 longitude to the east, and a large bend of the Tuotuohe River to the west [13,14] (Figure 1). The Qiangtang Block records the Carboniferous-Permian development, evolution, and closure of the Tethys Ocean; the Early Triassic amalgamation with the Kunlun Block; the Early Cretaceous conjoining with the Lhasa Block as a result of southward subduction of the Bangonghu-Nujiang Ocean [15,16]; and the far-field effects of the Late Cretaceous subduction of the Indian Plate beneath the Eurasian Plate [17], which caused a fundamental transition in the crust-mantle dynamics of the region.…”

Section: Geological Settingmentioning

confidence: 99%

Geology, Fluid Inclusions, and C–H–O–S–Pb Isotope Geochemistry of Pb–Zn Deposits within the Tuotuohe Region of the Tibetan Plateau: Implications for Ore Genesis

2023

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The Tuotuohe region is a highly prospective area for Pb and Zn mineral exploration. This paper contributes to our comprehension of the ore-controlling structures, fluid inclusions, and C–H–O–S–Pb isotope geochemistry of Pb–Zn deposits in this region. These deposits are generally hosted by carbonates and controlled by fractures. The principal homogenization temperatures of quart- and calcite-hosted inclusions ranged predominantly between 120 and 220 °C, with salinities varying from 6 to 16 wt.% NaCl equivalent. The Pb isotope compositions of the ore deposits are comparable to those of Cenozoic volcanic rocks in the region but differ significantly from those of the host rocks, indicating that the Pb within these deposits was derived from the mantle. The C, O, and S isotope compositions of samples exhibit a bimodal distribution based on whether they were derived from magma or host rocks, implying that magma-derived fluids underwent an isotopic exchange with the host rocks. The H-O isotope compositions of samples also indicate that ore-forming fluids were originally magmatic but were depleted by combining with meteoric water. These findings are also supported by variations in fluid inclusion homogenization temperatures and salinities. Taken together, these findings suggest that the Pb–Zn deposits of the Tuotuohe region developed from magma to hydrothermal fluids at medium–low temperatures.

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“…In the current research, the thermal conductivity test was done at a temperature of 25 °C. As the lab temperature was different from that of the well, the thermal conductivity of borehole cores was corrected according to the in situ temperature of the borehole (Liu et al, 2017), by employing the empirical formula developed by Sass et al (1992), which has been proved to be suitable for calibrating the conductivity within a depth of several kilometers in the continental areas (He et al, 2008).…”

Section: Thermal Conductivitymentioning

confidence: 99%

Characteristics of Terrestrial Heat Flow and Lithospheric Thermal Structure in Typical Intermountain Basin at the Eastern Foot of Yanshan Mountain, North China

Liu

Wang

et al. 2021

Front. Earth Sci.

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The Yanshan area is rich in geothermal resources. However, limited research has been done on the geothermal resources of intermountain basins in the area, which restrict the exploration and development of geothermal resources. In this study, the Yanheying Basin, a typical intermountain basin located in the eastern foothills of Yanshan Mountain, is selected to perform a comprehensive analysis regarding heat flow and lithospheric thermal structure, to have a better understanding of the geothermal background and resource utilization potential of the area. The methods of deep borehole temperature logging, and rock sampling and testing were applied. With geological and geophysical data collected in the surrounding basins, the thermophysical parameters of rock formations, terrestrial heat flow and temperature distribution on a crustal-scale around the basin were analyzed. Results show that the ratio of crust heat flow to that of the mantle in the Yanheying Basin is 0.68, which falls in the range of that of the North China Plain (0.6–0.8), showing an obvious result of lithospheric thinning. The results also show that both crust and mantle heat flows in the Yanheying Basin are far lower than those of the North China Plain. it indicates that the crust of the Yanheying Basin and the entire Yanshan area has experienced a low degree of damage. That provides a piece of good thermodynamic evidence for the spatial variation of North China Craton destruction. The depth of the Curie surface in the study area is estimated to be about 24 km, which is consistent with the results of aeromagnetic data analysis. It confirms the results of lithospheric thermal structure and deep temperature distribution in the Yanheying Basin. The Yanheying Basin has certain potential for geothermal resources utilization in the depth of 2–6 km, where probably exist several carbonate thermal reservoirs with medium-temperature geothermal water. The above results can provide new insights into the geothermal research and exploration of intermountain basins in the Yanshan area.

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Thermophysical parameters and lithospheric thermal structure in Guide Basin, Northeast Qinghai–Tibet Plateau

Cited by 9 publications

References 24 publications

Numerical Modeling of Reactive Transport and Self-Sealing Processes in the Fault-Controlled Geothermal System of the Guide Basin, China

Numerical Modeling of Reactive Transport and Self-Sealing Processes in the Fault-Controlled Geothermal System of the Guide Basin, China

Geology, Fluid Inclusions, and C–H–O–S–Pb Isotope Geochemistry of Pb–Zn Deposits within the Tuotuohe Region of the Tibetan Plateau: Implications for Ore Genesis

Characteristics of Terrestrial Heat Flow and Lithospheric Thermal Structure in Typical Intermountain Basin at the Eastern Foot of Yanshan Mountain, North China

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