川西康定老榆林高温地热地球物理特征与形成机制研究

Geophysical Characteristics and Formation Mechanism of High-Temperature Geothermal Resources inLaoyulin, Kangding, Western Sichuan

川西地区地热资源丰富,康定地区由中谷至老榆林一线,发育有多个高温地热田。通过对川西地区重磁资料和地质构造背景的分析,总结川西地区地热的分布特征,重点应用宽频大地电磁测深、音频大地电磁测深剖面及钻井资料,对研究区不同深度和尺度的地热要素进行探讨。研究结果表明:大量地热点发育在断裂附近,呈现出明显的空间分布相关性。在鲜水河断裂带下方的部分熔融体为本区高温地热田提供了主要热源。老榆林地热田主要受南北向深大断裂的次级构造和与之交错的东西向断裂构造控制,断裂破碎带构成热储,是深部热水上涌的通道。本文探讨了川西康定地区多尺度地球物理结构,高温地热资源的形成和分布与多要素耦合密切相关,构建出本区三维的地热地质模型。川西康定地区具有良好的高温地热水形成条件,通过地热资源开发,可促进川西地区社会经济发展。

Geothermal resources are abundant in western Sichuan,and several high-temperature geothermal fields are distributed from Zhonggu to Laoyulin in Kangding.The distribution characteristics of geothermal energy in the region were analyzed by gravity and magnetic data as well as the geological structural background of western Sichuan,with a focus on applying broadband magnetotelluric sounding,audio magnetotelluric sounding profiles,and drilling data to explore geothermal elements at different depths and scales in the study area.The research shows that a large number of geothermal spots are developed near faults,showing a clear spatial distribution correlation.The primary heat source for the high-temperature geothermal field in this region is the partially melting body beneath the Xianshuihe fault zone.The crossing east-west fault structures and the secondary structures of the north-south deep fault primarily govern the Laoyulin thermal field.A thermal reservoir and a route for the upwelling of deep hot water are formed by the fault fracture zone.This article explores the multi-scale geophysical structure of the Kangding area in western Sichuan.The formation and distribution of high-temperature geothermal resources are closely related to the coupling of multiple factors.A three-dimensional geothermal geological model of this area has been constructed.The Kangding area in western Sichuan has favorable conditions for the formation of high-temperature geothermal water,and the development of geothermal resources can promote the social and economic development of the region.