张健. 0: 长白山天池火山地热系统—岩浆囊与隐伏高温地热资源. 地震学报. DOI: 10.11939/jass.20220180
引用本文: 张健. 0: 长白山天池火山地热系统—岩浆囊与隐伏高温地热资源. 地震学报. DOI: 10.11939/jass.20220180
Jian ZHANG. 0: Changbaishan Tianchi volcano geothermal system: magma chamber and hidden high-temperature geothermal resources. Acta Seismologica Sinica. DOI: 10.11939/jass.20220180
Citation: Jian ZHANG. 0: Changbaishan Tianchi volcano geothermal system: magma chamber and hidden high-temperature geothermal resources. Acta Seismologica Sinica. DOI: 10.11939/jass.20220180

长白山天池火山地热系统—岩浆囊与隐伏高温地热资源

Changbaishan Tianchi volcano geothermal system: magma chamber and hidden high-temperature geothermal resources

  • 摘要: 长白山天池火山是晚新生代中心喷发式复合型层状火山,全新世以来发生过多次大规模喷发,与深部岩浆热扰动活动相关的构造地震、地表形变、温泉气体组份等均显示该火山仍可能再次喷发,是我国东部潜在的高温地热资源区。长白山天池火山周边地下水十分丰富,具有形成高温水热活动的岩浆囊热源,为探索地壳浅层隐伏的高温地热资源,本文在野外考察基础上,利用地热学方法,计算了该区地层结构与热状态,分析了地表下的火山地热系统。结果表明:长白山天池火山区地下2km深度的温度在66~110℃之间,12km深度的温度在313~417℃之间;该区居里面深度较浅,平均深度12.7km,居里点温度为375℃,其中,长白山天池火山喷发中心和望天鹅火山喷发中心为居里面上隆区;在人工地震基底速度约束下,沉积地层重力反演发现,在约3.5~5.5km深度存在密度梯级高压带,该高压带与12km深度的岩浆囊之间是形成隐伏高温地热资源的有利区域。

     

    Abstract: Changbaishan Tianchi volcano is a late Cenozoic central eruptive composite layered volcano. Since the Holocene, many large-scale eruptions have occurred. So far, the data of tectonic earthquake, surface deformation and hot spring gas composition related to deep magmatic thermal disturbance indicate that volcanoes will still erupt again, which is a potential high-temperature geothermal resource area in eastern China. There are abundant groundwater resources around Changbaishan Tianchi Volcano, and there is sufficient underground heating-sources in magma chamber, which provides the potential advantage of forming high-temperature geothermal resources. In order to study the high temperature geothermal resources hidden in the shallow crust, this paper uses geothermal methods to calculate and analyze the stratigraphic structure, thermal state and volcanic geothermal system in this area based on field invesigation. The results show that the temperature at 2km depth is 66~110℃, and that at 12km depth is 313~417℃. The Curie isotherm surface is shallow, with an average depth of 12.7km and a Curie point temperature of 375 ℃ in this area. The eruption center of Changbaishan Tianchi volcanic and Wangtian'e volcano is the uplift area of Curie isothermal surface. Under the constraint of basement velocity of artificial earthquake, gravity inversion found that, there are density step high pressure zones in the sedimentary strata with a depth of about 3.5~5.5 km. It is a favorable area for forming concealed high-temperature geothermal resources between high pressure zone and magma chamber.

     

/

返回文章
返回