Research Article
Mantle-Derived Helium Emission near the Pohang EGS Site, South Korea: Implications for Active Fault Distribution
Table 1
Sampling information, gas composition, and ratios of the main components of the Pohang samples.
| | ID | Region | Latitude | Longitude | Date | Type | T | pH | Well depth | He | CH4 | N2 | O2 | Ar | CO2 | He/Ar | N2/Ar | N2/He |
| | | °N | °E | | | °C | | m | ppm | (vol.%) | | | | | | | | | P-11 | Heunghae | 36.08608 | 129.321591 | 2019-02-21 | Groundwater | 15.4 | 8.5 | 120 | 104 | 0.2 | 94.0 | — | 2.1 | 4.1 | 0.005 | 45 | 9,041 | | P-12 | | 36.12613 | 129.382112 | 2019-02-20 | Groundwater | 14.3 | 7.3 | 154 | 215 | 0.6 | 88.1 | 2.0 | 1.7 | 7.6 | 0.01 | 53 | 4,099 | | P-14 | | 36.12574 | 129.360214 | 2019-02-20 | Groundwater | 16.4 | 7.2 | 110 | 170 | 36.7 | 32.5 | 0.2 | 0.6 | 30.0 | 0.03 | 51 | 1,909 | | DS-1 | | 36.14254 | 129.319276 | 2019-02-21 | Groundwater | 15.4 | 7.9 | 120 | 279 | — | 63.5 | — | 1.3 | 36.6 | 0.02 | 50 | 2,277 | | PH19-01 | | 36.11937 | 129.346867 | 2019-04-11 | Groundwater | 18.0 | 7.0 | 130 | 9 | 3.8 | 73.0 | — | 1.6 | 22.0 | 0.001 | 46 | 81,078 | | PH19-03 | | 36.13743 | 129.357115 | 2019-04-12 | Groundwater | 16.5 | 6.0 | 30 | 14 | 0.2 | 53.8 | — | 1.1 | 45.4 | 0.001 | 51 | 38,400 | | PH19-04 | | 36.13393 | 129.36331 | 2019-04-12 | Groundwater | 19.1 | 7.0 | 150 | 44 | 0.6 | 76.3 | — | 1.3 | 22.0 | 0.003 | 57 | 17,332 | | PH19-05 | | 36.13235 | 129.366165 | 2019-04-12 | Groundwater | 17.7 | 7.0 | 150 | 101 | 1.3 | 61.8 | — | 1.3 | 35.7 | 0.01 | 49 | 6,114 | | PH19-06 | | 36.12957 | 129.349261 | 2019-04-12 | Groundwater | 17.1 | 7.0 | 78 | 468 | 0.4 | 66.2 | 1.4 | 1.5 | 30.5 | 0.03 | 45 | 1,414 | | PH19-10 | | 36.07346 | 129.326287 | 2019-04-13 | Groundwater | 15.9 | 7.0 | 120 | 12 | 0.6 | 62.9 | — | 1.4 | 35.6 | 0.001 | 46 | 52,442 | | PH19-11 | | 36.07565 | 129.32894 | 2019-04-13 | Groundwater | 16.8 | 7.0 | 120 | 43 | 0.1 | 77.7 | — | 1.6 | 21.0 | 0.003 | 48 | 18,063 | | PH19-12 | | 36.09678 | 129.350515 | 2019-04-13 | Groundwater | 17.3 | 6.0 | 230 | 701 | 18.7 | 47.5 | — | 1.0 | 33.1 | 0.07 | 49 | 678 | | PH19-07 | Yeonil | 36.01893 | 129.306846 | 2019-04-13 | Groundwater | 20.5 | 8.0 | 160 | 2744 | 34.3 | 57.9 | — | 0.9 | 6.9 | 0.3 | 64 | 211 | | PH19-08 | | 36.02889 | 129.304796 | 2019-04-13 | Groundwater | 20.2 | 8.0 | 160 | 597 | 42.9 | 48.1 | — | 0.9 | 8.3 | 0.1 | 55 | 806 | | PH19-09 | | 36.02730 | 129.302284 | 2019-04-13 | Groundwater | 16.1 | 7.0 | — | 7 | 0.1 | 75.2 | — | 1.6 | 23.4 | 0.0004 | 46 | 107,400 | | PH-3 | | 36.02572 | 129.311889 | 2018-11-17 | Groundwater | 17.0 | 9.0 | 101 | 8 | 31.0 | 60.0 | 8.0 | 0.9 | 0.1 | 0.001 | 67 | 74,988 | | P-2 | Sinkwang | 36.10668 | 129.248979 | 2019-02-20 | Groundwater | 15.4 | 7.1 | 120 | 16 | 0.1 | 84.2 | — | 1.3 | 14.7 | 0.001 | 67 | 52,631 | | P-3 | | 36.19378 | 129.242729 | 2019-02-20 | Groundwater | 15.2 | 7.4 | 210 | 16 | 0.1 | 74.6 | — | 1.6 | 24.3 | 0.001 | 48 | 46,613 | | P-4 | | 36.10299 | 129.245568 | 2019-02-20 | Groundwater | 15.0 | 6.6 | 88 | 11 | 0.1 | 69.3 | 0.8 | 1.3 | 28.5 | 0.001 | 53 | 63,000 | | P-5 | | 36.11097 | 129.247894 | 2019-02-20 | Groundwater | 14.8 | 7.1 | 120 | 32 | — | 60.8 | — | 1.2 | 41.4 | 0.003 | 51 | 19,009 | | P-7 | | 36.14834 | 129.244634 | 2019-02-20 | Groundwater | 16.0 | 6.5 | 178 | 14 | 0.1 | 61.5 | — | 1.2 | 37.8 | 0.001 | 52 | 43,921 |
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