张掖—民乐盆地中新生界地层结构及对地热的控制作用  

MESOZOIC CENOZOIC STRATIGRAPHIC STRUCTURE AND ITS CONTROL ON GEOTHERMAL ENERGY IN ZHANGYE-MINLE BASIN

作　　者：尹政 柳永刚 张旭儒 王春磊 高月 张玲 YIN Zheng;LIU Yong-gang;ZHANG Xu-ru;WANG Chun-lei;GAO Yue;ZHANG Ling(Institute of Hydrogeology and Engineering Geology,Gansu Provincial Bureau of Geology and Mineral Exploration and Development,Zhangye 734000,China;Gansu Key Laboratory of Underground Water and Geothermal Resources,Lanzhou 730050,China;Geological Fund Management Center of Gansu Province,Lanzhou 730000,China)

机构地区：[1]甘肃省地矿局水文地质工程地质勘察院,甘肃张掖734000 [2]甘肃省地下水工程及地热资源重点实验室,甘肃兰州730000 [3]甘肃省地质勘查基金管理中心,甘肃兰州730000

出　　处：《甘肃地质》2021年第3期49-56,共8页Gansu Geology

基　　金：甘肃省地质勘查基金“张掖国家体育公园地热资源普查”项目的资助。

摘　　要：张掖—民乐盆地地质构造简单但地层岩性复杂,由古生界结晶变质岩及加里东期侵入岩组成的基底凸凹起伏,中上部沉积了巨厚的、基本呈水平分布的内陆河湖相细颗粒中新生界碎屑岩类,上部为数百米乃至上千米厚的第四系松散堆积物。根据相关研究成果[1-4],其中新近系中新统白杨河组砂岩、砂砾岩分布连续稳定,埋藏深度一般700~2150 m,平均厚度约170 m,构成盆地的主要热储层;碎屑岩类底部与结晶变质岩或侵入岩风化破碎带构成盆地的次要热储层。热源来自深部地壳或上地幔的热传导,热水温度受三方面的因素影响:一是热储埋藏深度越深,热水的温度越高;二是热储越靠近导热率高的岩体时,热水的温度越高;三是盖层厚度越大,保温性越好,热水的温度越高。The geological structure of Zhangye-Minle Basin is simple,but the lithology is complex.The basement consists of Paleozoic crystalline metamorphic rocks and Caledonian intrusive rocks in the middle and upper part of the basin.There are thick and horizontal fine-grained Meso-Cenozoic clastic rocks of inland fluvial and lacustrine facies.The upper part is the Quaternary loose deposit hundreds of meters or even up to 1000 meters thick.According to the relevant research results.The sandstone and glutenite of Miocene Baiyanghe formation of Neogene are distributed continuously and stably.With burial depth of 700-2150 m and average thickness of 170 m.Constituting the main thermal reservoir of the basin.The bottom of clastic rocks and the weathering and fracture zones of crystalline metamorphic rocks or intrusive rocks constitute the secondary thermal reservoirs in the basin.The heat source comes from the heat conduction of deep crust or upper mantle.The temperature of hot water is affected by three factors:first,the deeper the buried depth of the heat storage,the higher the temperature of the hot water;the second is that the closer the thermal storage is to the rock mass with high thermal conductivity,the higher the temperature of the hot water;thirdly,the greater the thickness of the cover layer,the better the thermal insulation,the higher the temperature of the hot water.

关 键 词：地层结构 热水 热源 水化学 甘肃张掖 

分 类 号：P56[天文地球—构造地质学] P314[天文地球—地质学]