综合物化探方法在湖北通山县厦铺-杨芳林地热勘察中的应用  

Application of comprehensive geophysical and geochemical prospecting method in Xiapu-Yangfanglin geothermal exploration in Tongshan county,Hubei province

作　　者：杜天朗 李保珠[1] DU Tian-lang;LI Bao-zhu(School of Land and Resources Engineering,Kunming University of Science and Technology,Kunming,Yunnan,650093,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093

出　　处：《地下水》2024年第3期134-137,共4页Ground water

摘　　要：以湖北咸宁市通山县厦铺—杨芳林地热田重点勘查区为研究对象,基于瞬时测氡法和广域电磁法两种方法对研究区地热资源进行勘察,利用勘察成果数据、图件,结合地质条件和地球物理特征,对物化探资料成果进行分析解释,初步查明测区地热分布特征,最终确定地热钻孔位置。根据地面调查及物探结果分析可知:研究区范围内的低视电阻率区为志留系组的泥质粉砂岩地层,高视电阻率区为奥陶—寒武系石英砂岩、泥质灰岩地层。杨芳林背斜在深部出现了一定的倾伏,施工钻孔在避开咸九高速保护范围后,仍处在背斜的转折端,且物探解译该处存在较大范围的相对地区低阻,该地热井在1200 m后,电阻率偏高,意味着揭穿志留系热储盖层,实际已施工地热井在1260 m进入奥陶系中统宁国组的石英砂岩地层,石英脉、节理裂隙较发育,为地下热水提供了良好的通道。建议在志留系(S)地层厚度较大的地段中,选择寒武系(∈)中相对低阻的部位布置钻孔。Taking the key exploration area of Xiapu-Yangfanglin geothermal field in Tongshan County,Xianning City,Hubei Province as the research object,based on the two methods of instantaneous radon measurement and wide-area electromagnetic method,the geothermal resources of the research area are surveyed,and the data and drawings of the survey results are used to analyse and interpret the results of physical and chemical exploration data in combination with the geological conditions and geophysical characteristics,so as to preliminarily identify the characteristics of the distribution of geothermal heat in the survey area,and to ultimately determine the Geothermal drilling location.Based on the ground investigation and analysis of the physical exploration results,it is known:The low apparent resistivity zone within the study area consists of muddy siltstone strata of the Silurian Formation,and the high apparent resistivity zone consists of Ordovician-Cambrian quartz sandstone and muddy greywacke strata.Yang Fanglin backslope in the depth of a certain dip,construction borehole in the avoidance of Xianjiu high-speed protection range,is still in the turning end of the backslope,and physical interpretation of the existence of a large range of relative area of low resistance,the geothermal wells in the 1200 m after the resistivity is high,means that the Zhiliu System thermal storage cover,the actual has been constructed geothermal wells in the 1260m into the Ordovician Mesozoic Ningguo Group of the quartz sandstone stratum,the quartz veins,joints and fissures are more developed,which provides a good channel for underground hot water.It is recommended that the relatively low resistance in the Cambrian(∈)be selected for the placement of boreholes in sections where the Silurian(S)strata are thicker.

关 键 词：广域电磁法 瞬时测氡法 地热勘察 

分 类 号：P641.72[天文地球—地质矿产勘探] P314.1[天文地球—地质学]