综合物探地质解释确定苏北宝应射阳湖地热区目标热储  

Using the method of geological interpretation based on comprehensive geophysical data to determine the location of geothermal resource reservoirs in the Sheyanghu area of Baoying,northern Jiangsu

作　　者：宋涛 赵松 包怡 吴建峰 吴灿 孙璐 SONG Tao;ZHAO Song;BAO Yi;WU Jianfeng;WU Can;SUN Lu(Jiangsu East China 814 Geophysical Exploration Co.,Ltd.,Nanjing 210007,Jiangsu,China;Jiangsu Geological Bureau,Nanjing 210001,Jiangsu,China)

机构地区：[1]江苏华东八一四地球物理勘查有限公司,江苏南京210007 [2]江苏省地质局,江苏南京210001

出　　处：《矿产勘查》2023年第8期1450-1457,共8页Mineral Exploration

基　　金：江苏省地质勘查专项资金项目“扬州城市地质调查(苏国土资函[2019]14号)”资助。

摘　　要：苏北盆地建湖隆起赋存丰富的地热资源,通过综合物探地质解释确定热储层对建湖隆起中段射阳湖地区地热资源勘探具有重要意义。本文采用广域电磁法、重力勘探及大地电磁测深法,查明了宝应县射阳湖镇6 km2范围内地热地质特征,从源、通、储、盖4个方面开展地热地质条件分析,结合地热成因分析优选钻井点位,设计探采结合井1口(设计井深2200 m),经钻探工程验证,终孔于寒武系碳酸盐岩地层(终孔深度2060 m),井口水温75℃,降深6.39 m出水量2095 m^(3)/d。实践证明,综合物探方法在地热资源勘查工作中,可提供热储层、导水导热构造、盖层等关键地热地质信息,为地热钻井设计提供重要依据。The Sheyanghu area of Baoying in Subei,located within the Jianhu Uplift structural unit of the Subei Basin,is known for its abundant geothermal resources.The identification of geothermal resource reservoirs in this region holds significant importance,and the geological interpretation method utilizing comprehensive geophysical data proves to be instrumental in achieving this goal.To investigate the study area,comprehensive methods of wild-field electromagnetic method,gravity exploration,and Magnetotelluric method were employed.Through this approach,an in-depth analysis of the geothermal geological characteristics within a 6 km2 area of Sheyanghu Town,Baoying County,was conducted.The assessment had a specific focus on four key aspects:the geothermal source,geothermal fluid channel,geothermal resource reservoir,and the overlying strata of the geothermal system.Based on the analysis of the geothermal geological conditions and a thorough study of the origins of geothermal resources,an optimal drilling location was determined.Consequently,a drilling well was designed for exploration and mining purposes,reaching a substantial depth of 2200 m.The subsequent verification results from the drilling project confirmed the result of the comprehensive geophysical interpretation.The drilling ended in the Cambrian carbonate formation(with a depth of 2060 m),and the wellhead water temperature was 75℃.When the water level dropped to a depth of 6.39 m,the water yield was 2095 m^(3)/d.The practical applica⁃tion of comprehensive geophysical methods for geothermal resource exploration has proven to be highly valuable.Its ability to provide crucial geothermal geological data,including the identification of geothermal resource reservoirs,assessment of structures facilitating hot water transportation,and the characterization of the overlying strata,serves as a pivotal foundation for the design of geothermal drilling operations.

关 键 词：综合物探 地热勘查 广域电磁法 钻井选址 

分 类 号：P314.1[天文地球—固体地球物理学] P631[天文地球—地球物理学]