| 川东地区大地热流及其对地热资源评价的启示 |
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| 关键词:Eastern Sichuan Basin geothermal gradient terrestrial heat flow thermal reservoir geothermal resource |
| 基金项目:成都理工大学珠峰科学研究计划(编号: 80000-2021ZF11415);国家自然科学基金项目(编号: 41972109) |
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| 摘要: |
| Terrestrial Heat Flow in Eastern Sichuan Basin and Its Revelation to Geothermal Resource Evaluation |
| Terrestrial heat flow is a comprehensive index that reveals the spatial distribution of temperature and the formation and occurrence conditions of geothermal resources in a region. The terrestrial heat flow in the Eastern Sichuan Basin has not been extensively studied, which restricts the understanding of the potential and distribution of geothermal resources in this area. In this study, the geothermal gradient and terrestrial heat flow in the Eastern Sichuan Basin are calculated using steady-state temperature measurement data of 178 systems in 4 wells and 76 formation-testing temperature data in 25 wells. Thereafter, the geotemperature of the Lower Permian Qixia–Maokou Formation thermal reservoir in the Eastern Sichuan Basin is calculated using the one-dimensional steady-state heat conduction equation. Finally, the types and potential of geothermal resources developed in the Qixia–Maokou Formation are obtained. The results show that the geothermal gradient in Eastern Sichuan Basin ranges from 16.0 to 21.3 °C/km, with an average value of (18.3±1.59) °C/km, and the terrestrial heat flow ranges from 44.3 to 67.7 mW/m2, with an average value of (55.5±6.0) mW/m2, which has the characteristics of a low-temperature geothermal field in the tectonic stable area. The Qixia–Maokou Formation is the most important thermal reservoirs in Eastern Sichuan Basin. It mainly develops medium–low temperature geothermal resources. Among them, low-temperature geothermal resources are mainly developed in the southwest structural zone, while medium-temperature geothermal resources are mainly distributed in the southeast, northeast, and northwest structural zones. Combined with the characteristics of thermal reservoirs, it can be concluded that the Qixia–Maokou Formation has the thermal reservoir and geothermal temperature conditions necessary to form rich geothermal resources. The results may provide important geothermal information for the exploration and evaluation of geothermal resources in this area. |
| LAN Lei,ZUO Yin-hui,FENG Ren-peng,CAI Jia-lan,YANG Mei-hua,XU Wen-li,XU Xu.2023.Terrestrial Heat Flow in Eastern Sichuan Basin and Its Revelation to Geothermal Resource Evaluation[J].Acta Geoscientica Sinica,44(1):169-179. |
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