河南温塘地区岩溶热储特征及开发利用潜力分析

Analysis of karst heat storage characteristics and development and utilization potential in Wentang area,Henan Province

为研究温塘地区深部岩溶热储资源的特征,利用勘探(物探、钻探)、原位测试(抽水—回灌试验)和室内试验(岩溶热水化学、同位素样品分析)等手段对该地区深部岩溶热储的空间展布、赋存特征、地温场、水化学等特征进行了系统分析,并对其地热流体质量、开发利用潜力进行了评价。研究主要结论包括:温塘地区岩溶热储为寒武系构造破碎带对流型带状热储(岩溶带状热储)和裂隙溶隙对流—传导混合型层状热储(岩溶层状热储)2类,属低温地热资源;热储岩性主要为寒武系中统张夏组(∈_(2)z)和寒武系上统(∈_(3))灰岩、白云岩,裂隙岩溶发育;地热水化学类型主要为SO_(4)·HCO_(3)-Na·Ca、HCO_(3)·SO_(4)-Na型,氟含量达到医疗价值浓度、偏硅酸含量达到矿水浓度;2000 m深度岩溶热储地热流体可采热量为1.60×10^(15) J/a,折合标准煤5.48×10^(4) t/a。研究成果表明温塘地区深部岩溶热储资源有较大的开采潜力,为本地区地热资源可持续开发利用、能源结构调整提供了可靠的依据。

In order to study the characteristics of deep karst heat reservoir resources in Wentang area,the spatial distribution,occurrence characteristics,geothermal field and hydrochemistry characteristics of deep karst heat reservoirs in Wentang area were systematically analyzed by means of exploration(geophysical prospecting,drilling),in-situ test(pumping-recharge test)and laboratory test(karst hot water chemistry and isotope sample analysis),and the quality of geothermal fluid and its development and utilization potential were evaluated.The main conclusions of the study are as follows:karst thermal reservoirs in Wentang area are convective banded heat reservoirs(karst banded heat reservoirs)in the Cambrian tectonic fracture zone and convection-conduction mixed layered thermal reservoirs(karst layered thermal reservoirs)in the Cambrian fissure fracture fractures,which belong to low-temperature geothermal resources,the lithology of thermal reservoirs is mainly limestone and dolomite of the Middle Cambrian Zhangxia Formation(∈_(2)z)and the Upper Cambrian(∈_(3)),and the fractured karst is developed,and the chemical types of geothermal water are mainly SO_(4)•HCO_(3)-Na•Ca、HCO_(3)•SO_(4)-Na type,fluorine content reaches the concentration of medical value,metasilicic acid content reaches the concentration of mineral water,and the recoverable heat of karst thermal fluid at a depth of 2000 m is 1.60×10^(15) J/a,equivalent to 5.48×10^(4) t/a of standard coal.The research results show that the deep karst thermal storage resources in Wentang area have great exploitation potential,which provides a reliable basis for the sustainable development and utilization of geothermal resources and the adjustment of energy structure in this area.