泉州官桥地区地热勘探靶区及成因模式探讨  

Exploration target area of geothermal resources in Guanqiao area,Quanzhou,and its genetic model

作　　者：陆晨明 刘春雷[1] 李亚松[1] 郝奇琛[1] 曹胜伟[1] 董岩 LU Chenming;LIU Chunlei;LI Yasong;HAO Qicheng;CAO Shengwei;DONG Yan(Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang,050061;Technology Innovation Center of Geothermal&Hot Dry Rock Exploration and Development,Ministry of Natural Resources,Zhengding,Hebei,050800)

机构地区：[1]中国地质科学院水文地质环境地质研究所,石家庄050061 [2]自然资源部地热与干热岩勘查开发技术创新中心,河北正定050800

出　　处：《地质论评》2021年第5期1345-1356,共12页Geological Review

基　　金：中国地质调查局地质调查项目(编号:DD20190303)的成果。

摘　　要：福建省地热资源主要以中低温水热系统为主,对于其中深部的控热过程及条件目前还存在认识上的不足。本次研究综合重力及广域电磁法对研究区的断层及凹陷进行了详细的勘测和解译,推测出5条主断裂和10条次级断裂,并划定出凹陷区的分布范围。泉州官桥地区的对流型地热资源是储热岩体、导热断层和保热盖层的"三元"聚热模式。根据该聚热模式,一级断裂F31与F8的交汇部位可圈定为一级地热勘探靶区,GQ-F2与GQ-F3和GQ-F4、GQ-F7与F29、F1与F30、GQ-F10与GQ-F11的交汇部位可圈定为二级地热勘探靶区。在一级地热勘探靶区内布设的DR02孔显示,0~300 m深度水温增速由快至慢,300 m深度以下温度稳定在48℃。利用地热验证钻孔检验了聚热模式及圈定靶区的可靠性,这对于泉州官桥地区的地热资源开发利用具有重要意义。Objectives:The geothermal resources in Fujian Province are mainly hydrothermal systems of medium—low temperature.However,there are still some deficiencies in understanding of the heat control process and conditions in the middle and deep crust of this area.Methods:In this paper,the gravity survey method and wide-field electromagnetic method were used to interpret faults and sag area in Guanqiao area of Quanzhou.Results:The study area is located in the gravity cascade zone and its southeast side is a steep region of uplift.The gravity anomaly values are mainly negative,with an increasing trend from northwest to southeast.The range of values is-521~-375μm/s2.The areas with high residual gravity and low residual gravity are distributed in an irregular band of NW and EW direction,and a few of them are NE direction.In addition,the Quaternary and fracture zones in the area have obvious characteristics of low resistance,followed by Nanyuan Formation.Granite as a whole is characterized by high resistivity,but the resistivity of intrusive rocks in early Yanshan is lower than that of late intrusive rocks.Conclusions:According to gravity and wide-field electromagnetic characteristics,we deduced 5 main faults and 10 secondary faults,and delimited the distribution range of sag area.Based on a detailed analysis of the heat control process and conditions,the geothermal resources in Guanqiao Area of Quanzhou should have three conditions:Heat-reserving rock,heat conductivity fault and heat retaining cover,which is a ternary heat accumulation model.According to the heat accumulation model,the intersection of the main faults F31 and F8 can be delineated as the primary target area of geothermal exploration,and the intersection of the faults (GQ-F2,GQ-F3 and GQ-F4;GQ-F7 and F29;F1 and F30;GQ-F10 and GQ-F11) can be delineated as the secondary target area of geothermal exploration.The DR02 borehole located in the primary target area of geothermal exploration shows that the water temperature increases from fast to slow at 0~300 m dep

关 键 词：地热 重力法 广域电磁法 聚热模式 勘探靶区 官桥地区 

分 类 号：P314[天文地球—固体地球物理学]