广东清远三坑地热田地质特征及勘查实践

为分析三坑地热田的地热地质特征，准确找到其最佳开发位置，采用多种方法对该地热田的某新工区进行了综合地热勘查。勘查结果表明：三坑地热田热储类型为岩溶裂隙-断裂构造型，地下热水受断裂构造控制，呈带状分布，并具明显的方向性和不均一性，赋存条件比较复杂；地热系统中的热、储、盖、通4要素，盖层不是必须的，如果有很好的热源、热通道和水源，盖层很薄甚至没有都可能存在可供经济开采的地热水资源；在深度500 m以内中浅层地热勘查中，将可控源音频大地电磁测深法（CSAMT）与浅孔测温相结合，可显著提高勘探成功率。 

Study on geological characteristics of Sankeng geothermal field in Qingyuan,Guangdong Province and investigation practice

In order to analyze the geological characteristics of Sankeng geothermal field, so as to find out the best development position accurately, the geothermal exploration on a new working area of this field in Qingyuan City was conducted by using comprehensive methods. The exploration results show that the geothermal reservoir type of Sankeng geothermal field is karst fractured -fault zone. The underground hot water storage controlled by faults is complex with zonal distribution and has a clear direction and heterogeneity. Furthermore, the cover layer is not necessary among the four factors (heat source, reservoir, seal, channel and cover) in the geothermal systems. If the heat source, thermal channel and water resource are good, a geothermal water resources for economic exploitation may exist even without a cover layer or with a thin cover layer. Within 500 meters of shallow geothermal exploration, CSAMT supplemented by shallow hole temperature measuring can increase the success rate of exploration.