承德市隆化一带半圈闭型地热田成热机理研究

Study on the Heat Formation Mechanism of Semi-trapped Geothermal Field in Longhua Area of Chengde City

本文通过地热地质调查、采样测试、测井等工作手段,分析了承德市隆化县地热地质条件,并从构造演化、热源、地温场特征、地球化学、地热流体成因等方向研究控热因素。研究表明,区内地热资源受构造控制明显,构造格局制约热流方向,热流通过深大断裂在山前构造破碎带中汇集,形成浅部地热田;隆化地热田内主要水源为大气降水,大气降水通过深部断裂循环而上,赋存在断裂带及裂隙发育带中,属华北地区典型的山前半圈闭型热储,区内地热资源勘查开发利用前景优越。

Through geothermal geological survey,sampling and testing,well logging and other working methods,this paper analyzes the geothermal geological conditions of Longhua County,Chengde City,and studies the thermal control factors from the aspects of structural evolution,heat source,geothermal field characteristics,geochemistry,and geothermal fluid origin.Research shows that the geothermal resources in the region are obviously controlled by structure,and the structure pattern restricts the direction of heat flow,heat flows through deep and large faults and converge in the piedmont structural fracture zone,forming a shallow geothermal field;the main water source in Longhua Geothermal Field is atmospheric precipitation,atmospheric precipitation circulates upwards through deep faults,and occurs in fault zones and fissure development zones,which is a typical piedmont semi-trap heat reservoir in North China,and the prospects for exploration,development and utilization of geothermal resources in the area are excellent.