摘要
山东临沂地区地热资源丰富,前人对于临沂地区沂沭断裂带成热模式存在诸多争议。通过对研究区地热地质条件、地球物理特征和地热井数据进行综合研究,从地热产生的源、通、储、盖四要素进行分析,研究结果表明研究区地热成矿模式为古生代层状和带状复合热储地热成矿模式,断裂带为带状热储,断裂带周边稳定区域为层状热储。研究区热储为古生代砂岩,同时张性、张扭性断裂发育,导致热储为层状和带状的复合热储,较单一成因热储要复杂。对地热井数据归一化处理分析表明,盖层岩性及厚度对深部地热水温度存在较大影响,并且热储厚度对水温也存在影响,表现为表层有第四系覆盖的地热水温度,较无第四系覆盖的要高;盖层厚度越大,水温越高,热储厚度越大,水温也越高。这为进一步地热勘查与开采提供了理论指导。
The Linyi area,Shandong Province hosts abundant geothermal resources,especially around the Yishu fault zone.In previous work,there are many controversies about the heat generation model for these resources.To address this issue,this work made a comprehensive study of geothermal geological conditions,geophysical characteristics and geothermal well data in the study area,and then analyzed the four elements of geothermal generation:source,passage,storage and cap.The research results show that a Paleozoic layered and banded composite thermal reservoir model can explain the heat generation beneath the study area.In this model,the fault zone hosts banded heat reservoirs,and the stable area around the fault zone hosts layered heat reservoirs.The thermal reservoirs in the study area are in Paleozoic sandstone.The development of tension and torsion-shear faults led to the formation of layered and banded composite reservoirs,which is more complicated than single-origin geothermal reservoirs.The normalization analysis of geothermal well data shows that the lithology and thickness of cap rocks have a great influence on the temperature of deep geothermal water,and the thickness of thermal reservoir also has an influence on the water temperature.Consequently the geothermal water temperature of the surface with Quaternary cover is higher than that of the surface without Quaternary cover,and the thicker the cap rock is,the higher the water temperature is;the thicker the thermal reservoir is,the higher the water temperature is.These insights provide theoretical guidance for further geothermal exploration and exploitation in the study area.
作者
曹艳玲
崔玉良
吴波
刘连
江海洋
崔素
王威
范振华
CAO Yanling;CUI Yuliang;WU Bo;LIU Lian;JIANG Haiyang;CUI Su;WANG Wei;FAN Zhenhua(School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083;Shandong Provincial No.1 Institute of Geo-Mineral Exploration,Jinan,Shandong 250000;Shandong Engineering Laboratory for High-Grade Iron Ore Exploration and Exploitation,Jinan,Shandong 250000)
出处
《地质与勘探》
CAS
CSCD
北大核心
2021年第5期1136-1148,共13页
Geology and Exploration
关键词
临沂地区
古生代
复合热储
热储模型
成矿机理
归一化
Linyi area
Paleozoic
composite geothermal reservoir
heat generation model
metallogenic mechanism normalization
