Characteristics of Deep Groundwater Flow and Temperature in the Tertiary Pohang Area, South Korea
Source abstract
Abstract
The geothermal characteristics of specific areas on Earth can be identified using geophysical and lithological logs based on deep boreholes, such as those more than 1000 m in depth. Based on the combined analyses of geophysical logs (temperature, caliper, electrical conductivity (EC), and natural gamma-ray logs) and lithological logs, as well as 1D steady-state heat transfer model, the deep groundwater flow and temperature were characterized in four deep boreholes (BH-1–BH-4) roughly 2000 m deep in the area of Heunghae-eup, Pohang, South Korea. The estimated thermal gradients from the temperature profiles are as follows: 22.37–30.77 °C/km for BH-1, 35.67–64.52 °C/km for BH-2, 40.85–46.44 °C/km for BH-3, and 33.33–35.71 °C/km for BH-4. According to the geophysical logs and lithology profiles, the groundwater mainly flows into and out of the boreholes through the basic dyke, rhyolite, and sandstone/mudstone. Evidently, the groundwater flows moving through the fractures and faults induce nonlinear temperature changes. The upward and downward groundwater flows passing through fractures and faults can be estimated using a 1D steady-state heat-transfer equation, by considering a fracture angle based on the lithological and geophysical profiles. To determine the direction (up/down) and rate of groundwater flow, the values for the parameter β were estimated as follows: −1.95 to 5.40 for BH-1, −13.48 to 4.87 for BH-2, −1.76 for BH-3, and −3.39 to 14.15 for BH-4.
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Research context
OpenAlex topics: Groundwater flow and contamination studies · Groundwater and Isotope Geochemistry · Geothermal Energy Systems and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Geological Sciences, Pusan National University, Busan 46241, Korea
Korea Institute of Geosciences and Mineral Resources, Korea, Daejeon 34132, Korea
Funding
Principal Research Fund of the KIGAM · National Research Foundation of Korea
References (62)
Show source-provided references
1. Turcotte, D.L., and Schubert, G. (1982). Geodynamics Application of Continuum Physics to Geological Problems, John Wiley and Sons.
2. A study on the effective utilization of temperature logging data for calculating thermal gradient
3. The analysis of thermal gradient at Icheon hot spa area
4. Lim, J.U. (1995). Geothermal potential in the Republic of Korea. Terrestrial H.E.A.T. Flow and Geothermal Energy in Asia, Oxford & IBH Publishing Co. Pvt. Ltd.
5. Heat flow in the Republic of Korea
6. Synrift stratigraphic geometry in a transfer zone coarse-grained delta complex, Miocene Pohang Basin, SE Korea10.1111/j.1365-3091.2004.00679.x ↗
7. Miocene crustal deformation, basin development, and tectonic implication in the southeastern Korean Peninsula
8. A study on potential geologic facility sites for carbon dioxide storage in the Miocene Pohang Basin, SE Korea10.14770/jgsk.2015.51.1.53 ↗
9. Song, Y.H. (2006). Development of Deep, Low-Enthalpy Geothermal Energy Technical Report OAA2003001-2006 4, Korea Institute of Geoscience and Mineral Resources (KIGAM).
10. Geology and geochemistry of volcanic and sedimentary rocks from deep borehole in the Heunghae area, North Kyungsang province
11. Rates of vertical groundwater movement estimated from the Earth’s thermal profile10.1029/WR001i002p00325 ↗
12. Estimating deep recharge rates beneath an interlobate moraine using temperature logs10.1111/j.1745-6584.2003.tb02402.x ↗
13. Evaluations of groundwater discharge rates from subsurface temperature in Cockburn sound, Western Australia10.1023/B:BIOG.0000006099.50469.b3 ↗
14. Comparison of alternative methodologies for identifying and characterizing preferential flow paths in heterogeneous aquifers10.1016/j.jhydrol.2007.07.007 ↗
15. Heat as a groundwater tracer in shallow and deep heterogeneous media: Analytical solution, spreadsheet tool, and field applications10.1002/hyp.11216 ↗
16. Davison, C.C. (1983). Use of Borehole-Geophysical Logs and Hydrologic Tests to Characterize Crystalline Rock for Nuclear-Waste Storage, Whiteshell Nuclear Research Establishment, Manitoba, and Chalk River Nuclear Laboratory, on, Canada: Technical Report.
17. Role of borehole geophysics in defining the physical characteristics of the Raft River geothermal reservoir, Idaho10.1190/1.1440999 ↗
18. Chemical composition of petrographic assemblages of igneous and relate rocks in South Korea
19. Three-dimensional magnetotelluric surveys for geothermal development in Pohang, Korea10.1071/EG07004 ↗
20. K-Ar age result 1
21. Um, S.H., Lee, D.W., and Bak, B.S. (1964). Explanatory Text of the Geological Map of Pohang Sheet.
22. Hwang, I.G. (1993). Fan-Delta Systems in the Pohang Basin (Miocene), SE Korea. [Ph.D. Thesis, Seoul Nat’l University].
23. Revised stratigraphy and reinterpretation of the Miocene Pohang basinfills, SE Korea: Sequence development in response to tectonic and eustassy in a back-arc basin margin10.1016/S0037-0738(01)00100-2 ↗
24. Interpretation of geophysical well logs from deep geothermal borehole in Pohang
25. Van Orstrand, C.E. (1934). Temperature gradients. Problems of Petroleum Geology, American Association of Petroleum Geologists.10.1306/SV6334C48 ↗
26. Steady one-dimensional fluid flow in a semi-infinite porous medium with sinusoidal surface temperature10.1029/JZ070i012p02821 ↗
27. Estimation of groundwater velocity in localized fracture zones from well temperature profiles10.1016/S0377-0273(98)00032-8 ↗
28. Thermal conductivity of US coals10.1029/96JB01884 ↗
29. Flash method of determining thermal diffusivity, heat capacity, and thermal conductivity10.1063/1.1728417 ↗
30. Thermal conductivity of porous media. I. Unconsolidated sands10.1063/1.1728419 ↗
31. Yalcin, H.T., and Dumlu, O. (1998, January 11–13). The estimation of vertical velocity of thermal water by use of temperature profile. Proceedings of the 20th New Zealand Geothermal Workshop, Auckland, New Zealand.
32. Temperature measurements in boreholes-an overview of engineering and scientific applications
33. Improved resolution of ambient flow through fractured rock with temperature logs10.1111/j.1745-6584.2009.00639.x ↗
34. Groundwater flow quantification in fractured rock boreholes using active distributed temperature sensing under natural gradient conditions10.1029/2018WR024319 ↗
35. Beck, A.E., and Balling, N. (1988). Determination of Virgin Rock Temperatures Handbook of Terrestrial Heat-Flow Density Determination, Springer.10.1007/978-94-009-2847-3_3 ↗
36. Using borehole flow logging to optimize hydraulic-test procedures in heterogeneous fractured aquifers10.1007/s100400050249 ↗
37. Fracture modeling from borehole image logs and water invasion in carbonate reservoirs with layer-bound fractures and fracture corridors10.1016/j.petrol.2019.04.052 ↗
38. The Nesjavellir geothermal field, Iceland; 1. Field characteristics and development of a three-dimensional numerical model
39. Mostaghel, B. (1999). Processing and Interpretation of Geophysical Well Logs from Well KJ-32, Krafla Geothermal Field, United Nations University Press.
40. Patten, E.P., and Bennett, G.D. (1963). Application of Electrical and Radioactive Well Logging to Ground-Water Hydrology.
41. Groundwater flow velocities in a fractured carbonate aquifer-type: Implications for contaminant transport10.1016/j.jconhyd.2019.02.001 ↗
42. Tarvainen, A.M. (2006). Identification of Water-Bearing Structures in the Outokumpu Deep Drill Hole by Geophysical Well Logging. [Master’s Thesis, Helsinki University of Technology].
43. Weissberger, A., and Rossiter, B.W. (1971). Conductometry. Physical Methods of Chemistry, Part IIA, Electrochemical Methods, Wiley Interscience.
44. Hale, F.V., and Tsang, C.-F. (1988). A Code to Compute Borehole Fluid Conductivity Profiles with Multiple Feed Points No. LBL-24928.10.2172/5100624 ↗
45. Hydrogeological characteristics of the Outokumpu deep drill hole
46. Normalized and color-filled logarithmic gamma-ray logs to enhance subsurface stratigraphic interpretation of carbonates and siliciclastics
47. Carbon dioxide storage resource assessment of Cretaceous-and Jurassic-age sandstones in the Atlantic offshore region of the northeastern United States10.1306/eg.09261919016 ↗
48. Application of neural network modelling for classifying hydrocarbon bearing zone, water bearing zone and shale with estimation of petrophysical parameters in Cauvery basin, India10.1007/s12040-019-1285-4 ↗
49. Combining borehole temperature and meteorologic data to constrain past climate change10.1016/0921-8181(92)90043-A ↗
50. Evidence for climatic warming in northcentral Oklahoma from analysis of borehole temperatures10.1029/95JB02625 ↗
51. Long-term tracking of climate change by underground temperatures10.1029/2005GL023714 ↗
52. Kim, H.C. (2014). Development of Technology of CO2 Geological Storage and Securing Green Energy Resources in Deep Geo-Environment (Part III), Korea Institute of Geoscience and Mineral Resources (KIGAM).
53. Zoth, G., and Haenel, R. (1988). Thermal Conductivity, Handbook of Terrestrial Heat-Flow Density Determination with Guideline and Recommendations of the International Heat Flow Commission, KLUWER Academic Pub.
54. Robertson, E.C. (1988). The Thermal Properties of Rocks.10.3133/ofr88441 ↗
55. Thermal properties of rocks in the Republic of Korea
56. Williams, C.F. (1994). The Thermal Regime of Santa Maria Province, California.
57. A methodology for using borehole temperature-depth profiles under ambient, single and cross-borehole pumping conditions to estimate fracture hydraulic properties
58. Keys, W.S. (1990). Borehole Geophysics Applied to Ground-Water Investigations: US Geological Survey Techniques of Water-Resources Investigations.
59. Nelson, J.W. (1983). Geologic Disturbances in Illinois Coal Seams, Illinois State Geological Survey. Circular 530.
60. Use of geophysical well-logs in evaluating crystalline rocks for siting of radioactive waste repositories
61. Using borehole geophysics and cross-borehole flow testing to define hydraulic connections between fracture zones in bedrock aquifers10.1016/0926-9851(93)90036-X ↗
62. Permeability determination in crystalline rocks by standard geophysical logs10.1190/1.1442308 ↗