广东英德市碳酸盐岩地热田地温场特征和成因

Geotherm Characteristics and Genesis of a Carbonatite Geothermal Field in Yingde, Guangdong Province

广东省英德市横石塘地区的地热田属于碳酸盐岩型地热资源。文章根据钻孔测温资料,结合区域地质资料,分析了该地热田的地温场特征、埋藏条件、补径排条件等。该地热田主要热储层为泥盆―石炭系碳酸盐岩,热水径流特征和地温场特征受吴川―四会深断裂带的一系列构造控制。测温曲线显示:地温场形态呈不规则长椭圆形,长轴方向近北西向,可以推断地温场变化与岩石的断裂、裂隙和溶蚀程度有关。本区无附加型热源,深循环为该区热水的主要形成原因。

The Hengshitang geothermal field,located in Yingde,Guangdong Province,is of carbonatite geothermal resources.Based on the regional geological data and the groundwater temperatures collected from the drilling holes,this paper analyses its geotherm characteristics,reservoir conditions,recharge,runoff,and drainage.Devonian-carboniferous carbonatites mainly compose geothermal reservoir of the field,whose geothermal water runoff and geotherm characteristics are controlled by a series of geological structures along Wuchuan-Sihui deep fault zone.Geotemperature curves show that the geothermal field appears an irregular long elliptic shape,with major axis being nearly NW trending,hence inferring that variation of the geotherm is related to fractures and corrosion degree of rocks.There is no additional heat source here,thus the geothermal water is mainly caused by deep cycling process.