文登地区浅部干热岩地热资源的赋存条件分析

Analysis on Occurrence Conditions of Geothermal Resources in Shallow Hot Dry Rock in Wendeng Area

摘要:

文登地区的5处天然温泉，多分布于河套边沿，水源足，水质优，水温高，证明该地区存在多处地温梯度异常。分析认为该地温梯度异常与太平洋板块边沿俯冲带、苏鲁超高压变质带放射性元素生热异常、深大断裂带的导热作用有关。根据各种岩性的导热性分析，认为含石英岩脉的花岗岩、花岗片麻岩或片麻岩为有利于干热岩资源开发利用的最优目的层。建议在5处天然温泉区域内，利用物探、钻探等勘查手段相结合，查明深大断裂带，调查地温梯度异常区，寻找浅部干热岩地热资源赋存区。

Abstract:

Five natural hot springs in Wendeng area distributed on the edge of the Hetao with enough water, high water quality and high water temperature. It is considered that there are multiple abnormal geothermal gradient in the region. The geothermal gradient anomaly has close relation with the subduction of the Pacific plate edge belt, Sulu UHP metamorphic belt heat of radioactive elements of abnormal and deep fracture zone thermal interaction. According to the analysis on thermal conductivity of various lithology, it is regarded that quartzite granite, granitic gneiss and gneiss are favorable optimal objective layers for development and utilization of hot dry rock resources. It is suggesed that in five natural hot springs in the area, by using geophysical prospecting, drilling and other exploration means, the deep fracture zone has been found out, geothermal gradient anomaly area has been surveyed, and shallow geothermal resources of hot dry rock storage area has been looked for.