宁波九龙湖火山岩非地热异常区地热资源勘查

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英文篇名：The Exploration of Abnormal Geothermal Volcanic Rock Zone in Ningbo Jiulong Lake Areas 作者：石晓今 ; 秦莉红 ; 邱京卫 英文作者：SHI Xiaojin;QIN Lihong;DONG Lufei;Tianjin Geothermal Exploration and Development Institute; 关键词：火山岩非地热异常区 ; 物探 ; 水文地球化学 英文关键词：Abnormal geothermal volcanic rock zone;;Geophysical exploration;;Hydrogeochemical analysis 中文刊名：CSDZ 英文刊名：Urban Geology 机构：天津地热勘查开发设计院; 出版日期：2019-03-15 出版单位：城市地质 年：2019 期：v.14 基金：浙江省宁波市九龙湖地区地热资源勘查 语种：中文; 页：CSDZ201901006 页数：6 CN：01 ISSN：11-5519/P 分类号：38-43

摘要

宁波地区属浙东南陆相火山岩区,地层在数千米深度内以侏罗系和白垩系的火山碎屑岩(凝灰质粉砂岩为主)及少量熔岩为主。这一套地层总体上孔隙不发育,渗透性极弱,岩石热导率低,属于非地热异常区。地质构造发展的长期地质历史造就了断裂和裂隙系统,该地区地热类型属隆起区断裂深循环型。九龙湖地区采用可控源音频大地电磁测深、氡气和热释汞综合测量及高精度重力等综合物探手段,以寻找孔隙度较高的地层或断裂构造带,对于寻找地热资源起到了很好的效果。分析研究区地表水和地热水的水文地球特征,运用地球化学温标预测地热水温度,表明地层深部可能还赋存有更高温度的热水。
        Ningbo, located at the continental volcanic zone of Southeast Zhejiang Province, is mainly covered by pyroclastic rocks(tuffaceous siltstone) and a small amount of lava from Cretaceous to Jurassic strata with the thickness of several kilometers.The strata are characterized by low porosity, very weak permeability, low thermal conductivity, which belong to the abnormal geothermal area. The long-term geological history has created fracture and fracture systems. The regional geothermal type is considered as a deep fault cycle in the uplift area. To detect the high porosity strata or fault tectonic zones, the integrated geophysical methods have been used in Jiulong Lake area, such as Controlled Source Audio-frequency Magnetotellurics(CSAMT),Radon and Mercury Measurement and High-precision Gravity Measurements. Some achievements have been obtained and played an important role in exploring geothermal resources in Jiulong Lake area. This analysis results of hydrogeological characteristics in geothermal wells, and surface water, and speculating temperature by geothermometer method, show that the highertemperature water in deep strata can be predicted.

引文

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