鄂西南咸丰背斜南东翼寒武系岩溶热储特征及地热流体成因  

Characteristics of Cambrian karst thermal reservoir and genesis of geothermal fluidin the southeast wing of Xianfeng anticline,southwestern Hubei Province

作　　者：万凯 徐辉 黄卫 吉雪峰 张凯 王宇 李泽威 李明龙 Wan Kai;Xu Hui;Huang Wei;Ji Xuefeng;Zhang Kai;Wang Yu;Li Zewei;Li Minglong(Second Geological Brigade of Hubei Geological Bureau,Enshi,Hubei 445000;Natural Resources and Planning Bureau of Laifeng County,Laifeng,Hubei 445700;Geological Environmental Center of Hubei Province,Wuhan,Hubei 430034)

机构地区：[1]湖北省地质局第二地质大队,湖北恩施445000 [2]来凤县自然资源和规划局,湖北来凤445700 [3]湖北省地质环境总站,湖北武汉430034

出　　处：《资源环境与工程》2024年第5期565-573,共9页Resources Environment & Engineering

基　　金：湖北省来凤县城区地热资源专项调查(KCDZ2022-24)。

摘　　要：近期通过实施来热1井钻探工程,在咸丰背斜南东翼探获寒武系娄山关组地热资源,该井自涌水量超3000 m^(3)/d,井口水温为46.3℃。为查明咸丰背斜南东翼娄山关组岩溶热储特征及地热流体成因,开展可控源音频大地电磁测深、地热流体水化学及H-O同位素研究,分析地热流体的水化学特征、热储温度及循环深度、补给区及径流路径等。研究表明,该区岩溶热储兼有带状热储与层状热储特征,以带状热储为主;地热流体主要赋存于娄山关组碳酸盐岩中,沿热储层中的层间裂隙、构造裂隙以及断裂破碎带走向径流;地热流体类型为SO_(4)·HCO_(3)-Ca·Mg型和SO_(4)-Ca·Mg型水,热储温度为57.4~62.7℃,循环深度为2.1~2.4 km,补给区主要为咸丰背斜南东翼寒武系娄山关组碳酸盐岩出露地区。研究成果可为区域地热资源的勘查开发提供参考。Recently,the geothermal resources of the Cambrian Loushanguan Formation were explored in the southeast wing of the Xianfeng anticline through the implementation of the Well LR1 drilling project.The self-inflow of the well exceeded 3000 m^(3)/d,and the wellhead water temperature was 46.3℃.In order to understand the characteristics of karst thermal reservoir and the genesis of geothermal fluid in Loushanguan Formation in the southeast wing of Xianfeng anticline,the controlled source audio-frequency magnetotelluric sounding,hydrochemistry and H-O isotope of geothermal fluid were studied,and the hydrochemical characteristics,thermal reservoir temperature and circulation depth,recharge area and runoff path of geothermal fluid were analyzed.The research shows that the karst thermal reservoir in this area has the characteristics of banded thermal reservoir and layered thermal reservoir,mainly banded thermal reservoir.Geothermal fluid mainly occurs in the carbonate rock salt of Loushanguan Formation,and flows along the interlayer cracks,structural cracks and fracture zones in the thermal reservoir.The geothermal fluid types are SO_(4)·HCO_(3)-Ca·Mg type and SO_(4)-Ca·Mg type.The geothermal reservoir temperature is 57.4 to 62.7℃,and the circulation depth is 2.1 to 2.4 km.The recharge area is mainly the carbonate outcrop area of Cambrian Loushanguan Formation in the southeast wing of Xianfeng anticline.The research results can provide reference for the exploration and development of regional geothermal resources.

关 键 词：地热流体 岩溶热储 寒武系娄山关组 来热1井 咸丰背斜 

分 类 号：P314.1[天文地球—固体地球物理学]