陕西关中盆地沣峪-高冠峪地区地热特征及成因研究

A Study on the Characteristics and Causes of Geothermal Energy Generation in Fengyu-Gaoguanyu Area in Guanzhong Basin,Shaanxi Province

关中盆地的沣峪-高冠峪地区是陕西省地热资源比较丰富的地区之一,地质构造位于西安凹陷与临蓝凸起结合处,地貌类型为秦岭山前洪积扇群与渭河阶地的复合部位。但目前缺乏对该地区地热资源的系统研究,限制了对于沣峪-高冠峪地热田地热资源的有效利用。利用物探方法[Ra A法、可控源音频大地电磁测深法(CSAMT)和直流电测深法]和浅层地下水化学特征分析方法(F-和Si O2含量分析),在地面调查和分析勘探资料的基础上,对沣峪-高冠峪地区的地热特征及成因进行了分析。分析结果表明:该区地热主要受F1断裂和F13断裂控制,地温梯度以F13断裂与F19断裂交点为最高点,向四周递减;地温梯度在垂向上随深度增加呈下降趋势并最终趋于常数;该地区地热的形成主要受地质构造、沉积特征、水分运移等因素控制;该地区的地热资源还具有埋深浅、水温高的特点。

The Fengyu-Gaoguanyu area in the Guanzhong Basin has one of the largest geothermal energy resource deposits in Shaanxi province.Geological structure zonation is located where the Xian depression and the Linlan heave join and the geomorphic types are a Qinling of the Weihe River.There is currently no systematic studies on piedmont diluvial fan cluster and the terrace the geothermal energy resources of this re- gion.This has hindered the effective utilization of the geothermal energy resources of the Fengyu-Gaoguanyu geothermal field.Using prospecting methods （the RaA method,the CSAMT method and the DC bathymetry method） and chemicaI characteristic analysis for shallow groundwater （F- and SiO2 contents analysis） , researchers analyzed the characteristics and causes of the generation of geothermal energy resources in the Fengyu-Gaoguanyu area,based on ground surveys and analysis of exploration data.Analysis results show that the geothermal ener- gy resources in the region are primarily dictated by F1 and F13 fractures and that the highest point of geothermal gradient is the point of intersection between F^3 from the center to the periphery.Vertically,the geothermal and eventually tends to become a constant.Major factors and F19.The geothermal gradient tends to decrease gradient tends to decline as the depth increases affecting the generation of geothermal energy re- sources in the region include geological structure,sedimentary characteristics and moisture transport.Other char- acteristics of the geothermal energy resources in the region include shallow pay zones and higher water tem- perature at the same recovery depths.