云南景洪盆地地热地质特征及成因分析

Geological Features of Geothermal Deposits in the Jinghong Basin of Yunnan Province and Their Genesis

景洪盆地隶属滇藏地热带之滇西中-高温地热区,区内岩浆岩分布较为广泛,活动性断裂较为发育,拥有形成地热的良好地质条件。研究表明,以澜沧江断裂(F1)为界,盆地内可划分出嘎洒-曼达-曼迈和曼贺蚌-曼养广东西两个地热田。西部地热田的热储层为临沧-勐海花岗岩体,东部热储层为南联山杂岩体。大气降水的入渗补给为地热水提供了丰富的水源,活动性断裂构成了地热水深循环的通道,广泛分布的岩浆岩体为地热水提供热能来源,本区地下热水的成因类型可划归为岩浆岩-构造断裂型。

The Jinghong basin lies in the middle-high temperature geothermal area of western Yunnan,a part of the Yunnan-Tibet geothermal zone.It hosts widely distributed magma rocks and active faults and possesses good conditions for geothermal depoists.Studies show that bounded by the Lancang River fault（F1）,the basin can be divided into two geothermal fields,i.e.,Gasa-Manda-Manmai and Manhefeng-Manyangguang geothermal fields.The geothermal reservoir of the western geothermal field is Lincang-Menghai granite mass,and that of the eastern one is the Nanlianshan complex rock mass.Precipitation recharge of ground water provides a rich source for the geothermal water,active faults form the deep circulation channels of geothermal water,and widespread magmatic masses provide thermal energy for the hot water.The study suggests the genesis of underground thermal water in this area can be classified to the type of magmatic rock-structural faults.