银川盆地东缘地热资源勘探远景评价——基于大地电磁测深和钻探探测  

Exploration Prospect of Geothermal Resources in the Eastern Margin of Yinchuan Basin:Magnetotelluric Sounding and Drilling Confirmation

作　　者：朱怀亮[1] 刘志龙[1] 曹学刚 胥博文[1] 杨忠彦[1] 程国强 李龙亮 邵炳松 赵超 ZHU Huailiang;LIU Zhilong;CAO Xuegang;XU Bowen;YANG Zhongyan;CHENG Guoqiang;LI Longliang;SHAO Bingsong;ZHAO Chao(Tianjin Geothermal Exploration and Development-Designing Institute,Tianjin 300250;Ningxia Institute of Geological Engineering,Yinchuan,Ningxia 750004)

机构地区：[1]天津地热勘查开发设计院,天津300250 [2]宁夏回族自治区地质工程院,宁夏银川750004

出　　处：《地质与勘探》2020年第6期1287-1295,共9页Geology and Exploration

摘　　要：银川盆地地热资源储量丰富,是我国中低温地热资源远景区之一。目前银川盆地开采的热储层主要是以孔隙型层状热储为主,而带状热储地热资源还未开发利用。为探明银川盆地东缘地热资源赋存情况,圈定研究区有利地段地热资源储藏范围,本文采用大地电磁测深法(MT)来探测银川盆地东缘深部地层结构及隐伏断裂构造特征,通过钻探验证和物探测井资料研究,基本查明了区内地下电性结构特征、地层岩性分布特征以及隐伏断裂位置和产状。结果表明,在黄河断裂上盘有利地段施工了四眼地热勘探井,均取得了较好效果。其中ZK01地热勘探井井深617 m,出水量达15000 m^3/d,井口水温42℃,这是目前宁夏回族自治区出水量最大的自流地热井,为今后地热勘探和开发利用提供了新的依据。Geothermal resources are abundant in the Yinchuan Basin which is one of prospective areas hosting low-medium temperature geothermal resources in China.At present the thermal reservoirs under exploitation are confined to pore type sandstone,while zonal reservoir geothermal resources are not exploited yet.The purpose of this work is to reveal the geological conditions of the geothermal resources in the eastern margin of Yinchuan Basin and delineate the range of potential geothermal reservoirs.The magnetotelluric(MT)method was applied to probe the deep stratigraphic structure and concealed faults.In combination with drilling confirmation and analysis of geophysical logging data,electric structure of the subsurface,the stratigrphic lithology,and the location and occurrence of the buried faults were largely clarified.Relying on these data,exploration of four geothermal wells was proved successful on the hanging wall of the Yellow River fault.Of them,the well DZ01617 meters deep,yielded 15,000 cubic metres of water a day,with water temperature of wellhead approximately 42℃.It is the largest artesian thermal-water well in Ningxia Autonomous Region so far.This work provides new evidence for the geothermal exploration and subsequent exploitation in this area.

关 键 词：银川盆地 黄河断裂 大地电磁测深 二维反演 钻探 地热远景评价 

分 类 号：P612[天文地球—矿床学]