| 基于多种估算方法的湖南省现今地温梯度综合确定 |
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| 关键词:radioactive heat generation geothermal gradient geothermal field Hunan Province |
| 基金项目:湖南省地质院科研基金项目(编号: HNGSTP202102);国家自然科学基金项目(编号: 41902310);中国地质调查局地质调查项目(编号: DD20221677; DD20189114) |
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| 摘要: |
| Comprehensive Determination of Present Geothermal Gradient in Hunan Province Based on Multiple Estimation Methods |
| At present, most geothermal wells in Hunan Province are thermal convection type with small depth (mostly shallow 500 m), and the geothermal gradient obtained from the temperature measurement data of geothermal Wells is generally much larger. In this paper, geothermal temperature scales, pipeline models, and deep geothermal temperature back-calculation methods based on the heat generation rate were used to estimate the geothermal gradient. The present geothermal gradients in Hunan Province were comprehensively determined. The high value geothermal field in Hunan Province is approximately located along the line of Baishan granitoid pluton, Weishan granitoid pluton, Mufushan granitoid pluton, and Huanglongshan granitoid pluton. The geothermal gradient in the southeast of the Hunan Province is greater than 3.0 ℃/100 m. The highest temperature of the Weishan granitoid pluton and Reshuiwei area at 5000 m depth and 6000 m depth reached 218.69 ℃, 216.70 ℃ and 258.99 ℃, 256.60 ℃, respectively. The combination of deep and large faults with the structural configuration of the joint part of multi-blocks makes the structural convergence zone in central Hunan Province in an open tectonic environment. This is conducive to the deep circulation of atmospheric precipitation and the intrusion of deep thermal material. This is the main reason for the formation of the high geothermal field in the central Hunan Province. The southeast of the Hunan Province is in front of the subduction and retraction of the West Pacific plate and is located in the junction zone between the Jiangnan orogenic belt and the Cathaysia plate, which is conducive to the deep circulation of atmospheric precipitation and the upwelling of deep thermal materials. Uranium deposits with a high radioactive heat generation rate also provide high crustal heat, which is the main reason for the formation of the high geothermal field in southeastern Hunan Province. The scientific definition of geothermal gradient and geothermal field points provide the direction for locating high temperature geothermal resources in Hunan Province. |
| OU Jian,PI Jian-gao,ZHANG Bao-jian,TANG Xian-chun,ZHOU Hua,GAO Jun,BAI Hua-qing,WANG Si-qi,OU Ren-wen,HUANG Yu-qi,PI Jing,WEN Juan.2023.Comprehensive Determination of Present Geothermal Gradient in Hunan Province Based on Multiple Estimation Methods[J].Acta Geoscientica Sinica,44(3):543-557. |
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