摘要
山东孤岛潜山凸起区是以古生界为基底的披覆背斜,发育巨厚的寒武纪—奥陶纪碳酸盐岩,具备形成大型裂隙岩溶热储的条件。为研究该区热储的开发利用前景及发电潜力,在深入分析该区地质背景的基础上,以Gg2孔为例,查明寒武系—奥陶系以碳酸盐岩为主,其中奥陶纪八陡组、五阳山组、北庵庄组,寒武纪—奥陶纪三山子组及寒武纪张夏组以灰岩和白云岩为主,可形成良好的裂隙岩溶热储,累计厚度约480 m。以热储中点处温度为平均温度,以中、低温双循环地热发电为利用方向,下限温度按70℃估算,该区裂隙岩溶热储可供发电的热量为804×10^(16)J,当服务年限设为30 a、热效率系数设为7%时,估算的发电潜力为595 MW,为大型地热田。
Gudao buried hill is a drape anticline with Palaeozoic as its basement,and massive Cambrian-Ordovician carbonate rocks are developed,having the potential of forming fissure karstic geothermal reservoir.In order to evaluate the utilization prospects of the geothermal reservoir and the generating potential,based on the analysis of the geologic background,the authors verified that the Cambrian-Ordovician stratigraphy is predominant by carbonate,taking borehole Gg2 as an example.Badou Formation,Wuyangshan Formation,Beianzhuang Formation of Ordovician,Sanshanzi Formation of Cambrian-Ordovician,and the Zhangxia Formation of Cambrian are mainly composed of limestone and dolomite,which are favorable to develop a fissure karstic geothermal reservoir.The gross thickness of the geothermal reservoir is 480 m.Designating the temperature at the middle point of the reservoir as the average reservoir temperature,aiming at binary geothermal power station as its utilization purpose,and setting the lower temperature limit as 70℃,the authors calculated out that geothermal resource contained in the fissure karstic geothermal reservoir is 804×10^16 J at Gudao buried hill.By setting the service lifetime of 30 years,and thermal efficiency of 7%,the generating potential at Gudao buried hill was estimated to be 595 MW,which was classified as a large geothermal field.
作者
赵季初
康凤新
ZHAO Jichu;KANG Fengxin(Shandong Provincial Lubei Geo-engineering Exploration Institute,Dezhou 253072,China;Shandong Provincial Bureau of Geology & Mineral Resources,Jinan 250013,China;Shandong Provincial Research Center of Geological Survey Engineering Technology,Jinan 250013,China)
出处
《中国地质调查》
2019年第1期10-16,共7页
Geological Survey of China
基金
山东省地质矿产勘查开发局"山东省地热资源综合评价(编号:鲁地字[2017]23号)"项目资助
关键词
潜山凸起区
裂隙岩溶热储
双循环地热发电
发电潜力
buried hill
fissure karstic geothermal reservoir
binary geothermal power station
generating potential
