摘要
基于江西省首个干热岩调查评价项目成果,确定龙南南有利区为干热岩资源前景较好的区块之一。为了解该有利区的岩体和盖层的热物理性质以及温度等参数,施工了江西省第一口干热岩参数井。地表及钻孔样品分析测试及测井测量结果显示,龙南南火山碎屑岩盆地下隐伏的燕山期花岗岩生热率高,地表和钻孔花岗岩样品平均生热率分别为5.20μW/m^(3)和7.08μW/m^(3)。盖层泥岩和玄武岩热导率分别为1.655 W/(m·K)和2.610 W/(m·K),低于花岗岩热导率3.090 W/(m·K),说明花岗岩产生的热量可受到较好的保存。在0~800 m处热参1井内岩体铀、钍、自然伽马值及生热率整体随深度增加而增加,之后趋于稳定。受区域断裂及其次生断层导热影响,井内地温梯度存在异常,1000 m深度处温度为46.8℃。研究成果表明龙南南有利区干热岩资源前景较好。
Based on the work results of the first dry hot rock investigation and evaluation project in Jiangxi province,it is determined that the favorable area of Longnannan is one of the better prospects for dry hot rock resources in Jiangxi province.The first dry hot rock parameter well in Jiangxi province was constructed in order to investigate the rock mass,cap rock thermal physical properties and temperature parameters of the Longnannan area.The results show that there are Yanshanian granites in Longnannan volcaniclastic basin,which have high heat generation rate.The average heat generation rate of granite samples of surface and borehole are 5.20μW/m^(3) and 7.08μW/m^(3) respectively.The thermal conductivity of mudstone and basalt in the favorable area of Longnannan are 1.655 W/(m·K)and 2.610 W/(m·K)respectively,which is lower than the thermal conductivity of 3.090 W/(m·K),indicating that the heat produced by granite can be well preserved.At 0~800 m,the uranium,thorium,natural gamma value and heat generation rate of the rock mass of the No.1 well increase with the increase of depth,and then tend to be stable.The temperature gradient in the No.1 well is slightly low but still abnormal,and the depth of 1000 m is 46.8℃,because of the influence of the heat conduction of regional faults and their secondary faults.The results of this study will provide a basis for the evaluation of dry hot rock in the concealed high radioactive granite area of Jiangxi province.
作者
胡秋祥
宋炉生
陈姗姗
HU Qiu-xiang;SONG Lu-sheng;CHEN Shan-shan(Jiangxi Institute of Coal Geology for Exploration Research, Nanchang 330001,China)
出处
《东华理工大学学报（自然科学版）》
CAS
2021年第1期1-8,共8页
Journal of East China University of Technology(Natural Science)
基金
江西省能源局项目(赣能综字〔2014〕120号)
江西省煤田地质局科技项目(赣煤地字〔2020〕55号)。
关键词
干热岩
地质特征
热导率
生热率
江西省
dry hot rock
geological characteristics
thermal conductivity
heat generation rate
Jiangxi province
