Surface geochemical anomaly pattern of medium-to-high temperature geothermal systems in South China and its application
The existence of thermal storage will correspondingly increase the temperature of surrounding strata and promote the continuous expansion, volatilization, upward migration, and loss of gas in the strata. As a result, a low-concentration gas field will be formed in the strata above geothermal reservo...
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KeAi Communications Co., Ltd.
2023-10-01
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| Series: | Energy Geoscience |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666759223000446 |
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| author | Guangzhi Li Guojian Wang Bin Hu Lirong Ning |
| author_facet | Guangzhi Li Guojian Wang Bin Hu Lirong Ning |
| author_sort | Guangzhi Li |
| collection | DOAJ |
| description | The existence of thermal storage will correspondingly increase the temperature of surrounding strata and promote the continuous expansion, volatilization, upward migration, and loss of gas in the strata. As a result, a low-concentration gas field will be formed in the strata above geothermal reservoirs. Geothermal reservoirs could in turn heat formation water and increase the solubility of soluble inorganic salts in the surrounding rocks and the total dissolved solids (TDS) content in the formation water. Since water can strongly wet and permeate strata, the dissolved inorganic salts migrate into upper strata along with water, giving rise to the formation of a high-concentration inorganic salt field in the strata above geothermal reservoirs. A higher geothermal reservoir temperature corresponds to more significant characteristics mentioned above. Therefore, a medium-to-high temperature geothermal system has a surface geochemical anomaly pattern of high inorganic salt concentrations and low gas concentrations (also referred to as the high-salt and low-gas pattern). This pattern is applied to the surface geochemical exploration of the two geothermal fields in Guangdong Province, i.e., the Huangshadong geothermal field in Huizhou City and the Xinzhou geothermal field in Yangjiang City, revealing low-concentration gas fields above both. The application results also show that the exposed thermal spring water in both geological fields has higher concentration of dissolved inorganic salt than the surface water and nearby seawater, forming high-amplitude anomalies on the surface above geothermal reservoirs. These characteristics, as well as the measured temperature at known geothermal wells, verify the validity of the high-salt and low-gas pattern of medium-to-high temperature geothermal systems proposed in this study. Moreover, the high-salt and low-gas pattern proposed predicts three favorable medium-to-high temperature geothermal zones in the surface geochemical exploration of the Shiba Basin near the Huangshadong geothermal field. |
| first_indexed | 2024-03-11T21:23:58Z |
| format | Article |
| id | doaj.art-7a317dce7d81455a82c4d9ed5214a755 |
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| language | English |
| last_indexed | 2024-03-11T21:23:58Z |
| publishDate | 2023-10-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Energy Geoscience |
| spelling | doaj.art-7a317dce7d81455a82c4d9ed5214a7552023-09-28T05:26:46ZengKeAi Communications Co., Ltd.Energy Geoscience2666-75922023-10-0144100198Surface geochemical anomaly pattern of medium-to-high temperature geothermal systems in South China and its applicationGuangzhi Li0Guojian Wang1Bin Hu2Lirong Ning3Corresponding author.; Wuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi, Jiangsu, 214126, ChinaWuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi, Jiangsu, 214126, ChinaWuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi, Jiangsu, 214126, ChinaWuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi, Jiangsu, 214126, ChinaThe existence of thermal storage will correspondingly increase the temperature of surrounding strata and promote the continuous expansion, volatilization, upward migration, and loss of gas in the strata. As a result, a low-concentration gas field will be formed in the strata above geothermal reservoirs. Geothermal reservoirs could in turn heat formation water and increase the solubility of soluble inorganic salts in the surrounding rocks and the total dissolved solids (TDS) content in the formation water. Since water can strongly wet and permeate strata, the dissolved inorganic salts migrate into upper strata along with water, giving rise to the formation of a high-concentration inorganic salt field in the strata above geothermal reservoirs. A higher geothermal reservoir temperature corresponds to more significant characteristics mentioned above. Therefore, a medium-to-high temperature geothermal system has a surface geochemical anomaly pattern of high inorganic salt concentrations and low gas concentrations (also referred to as the high-salt and low-gas pattern). This pattern is applied to the surface geochemical exploration of the two geothermal fields in Guangdong Province, i.e., the Huangshadong geothermal field in Huizhou City and the Xinzhou geothermal field in Yangjiang City, revealing low-concentration gas fields above both. The application results also show that the exposed thermal spring water in both geological fields has higher concentration of dissolved inorganic salt than the surface water and nearby seawater, forming high-amplitude anomalies on the surface above geothermal reservoirs. These characteristics, as well as the measured temperature at known geothermal wells, verify the validity of the high-salt and low-gas pattern of medium-to-high temperature geothermal systems proposed in this study. Moreover, the high-salt and low-gas pattern proposed predicts three favorable medium-to-high temperature geothermal zones in the surface geochemical exploration of the Shiba Basin near the Huangshadong geothermal field.http://www.sciencedirect.com/science/article/pii/S2666759223000446Medium-to-high temperatureGeothermal fieldGeochemical explorationAnomaly pattern |
| spellingShingle | Guangzhi Li Guojian Wang Bin Hu Lirong Ning Surface geochemical anomaly pattern of medium-to-high temperature geothermal systems in South China and its application Energy Geoscience Medium-to-high temperature Geothermal field Geochemical exploration Anomaly pattern |
| title | Surface geochemical anomaly pattern of medium-to-high temperature geothermal systems in South China and its application |
| title_full | Surface geochemical anomaly pattern of medium-to-high temperature geothermal systems in South China and its application |
| title_fullStr | Surface geochemical anomaly pattern of medium-to-high temperature geothermal systems in South China and its application |
| title_full_unstemmed | Surface geochemical anomaly pattern of medium-to-high temperature geothermal systems in South China and its application |
| title_short | Surface geochemical anomaly pattern of medium-to-high temperature geothermal systems in South China and its application |
| title_sort | surface geochemical anomaly pattern of medium to high temperature geothermal systems in south china and its application |
| topic | Medium-to-high temperature Geothermal field Geochemical exploration Anomaly pattern |
| url | http://www.sciencedirect.com/science/article/pii/S2666759223000446 |
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