基于三维地质建模的地热资源潜力评价:以施甸地热区为例  

Geothermal Resources Evaluation Based on 3D Geological Modeling:The Case of Shidian Geothermal Area

作　　者：赵杰[1,2] 郭清海 Zhao Jie;Guo Qinghai(Key Laboratory of Deep Geothermal Resources,MNR,China University of Geosciences,Wuhan 430078,China;School of Environmental Studies,China University of Geosciences,Wuhan 430078,China)

机构地区：[1]中国地质大学自然资源部深部地热资源重点实验室,湖北武汉430078 [2]中国地质大学环境学院,湖北武汉430078

出　　处：《地球科学》2023年第3期1107-1117,共11页Earth Science

基　　金：国家自然科学基金项目(No.42077278);中央高校基本科研业务费专项资金项目(No.CUGSDZX002)。

摘　　要：传统热储法进行地热资源评价虽简便,但评价结果误差通常较大,本研究以施甸地热田为研究区,基于区内地质和地热地质条件,结合地球物理和钻孔资料,用GMS软件建立了三维地质模型,展示了研究区地热储层和盖层的展布情况.考虑到研究区内地热资源评价参数的差异,按照热储温度将研究区划分为9个子区,结合已建立的三维地质模型计算热储体积,利用改进的热储法来准确、动态评价研究区的地热资源量,计算出研究区地热水中储存的热量为1.38×10^(17)J,热储岩石中储存的热量为1.49×10^(19)J,地热资源总量为1.5×10^(19)J.根据地热水可开采量计算结果,若合理开发利用施甸地热水资源,每年可节约4.36×10^(7)t标准煤.本研究为施甸地热资源的科学、合理评价提供了新的模式.Although it is simple to evaluate geothermal resources using the traditional thermal reservoir method,the deviation of the evaluation results is usually large.Taking the Shidian geothermal field as a typical study area,a 3D geological model showing the distribution of geothermal reservoirs and caprocks in the area was built,using GMS software on the basis of geological and geothermal geological conditions in the region,combined with geophysical and drilling data.Considering the differences in the evaluation parameters of geothermal resources,the study area is divided into 9 sub-areas according to the thermal storage temperature,and the thermal reservoir volume is calculated in combination with the established three-dimensional geological model,and the improved thermal storage method is used to accurately and dynamically evaluate the study area.The heat stored in geothermal waters of the study area was calculated to be 1.38×10^(17)J,the heat stored in thermal storage rocks was 1.49×10^(19)J,and the total geothermal resources was 1.5×10^(19)J.According to the calculation results of the extractable amount of geothermal water,as well as the reasonable development and utilization of geothermal water resources in Shidian,4.36×10^(7)t of standard coal can be saved annually.This study provides a new mode for the scientific and rational evaluation of geothermal resources in Shidian.

关 键 词：三维地质建模 地热资源评价 GMS 施甸 地热水资源 

分 类 号：P314[天文地球—固体地球物理学]