Research On The Application Of Integrated Geophysical Methods In The Antu Haigou Geothermal Exploration

As a kind of green and environmental protection energy,geothermal resources has been attached great importance to the utilization and all counties are researching and developing geothermal resources in the world.Single geophysical exploration method used in early geothermal exploration with blindness and multiple resolution.As a result,the interpretation of abnormal results is not enough to accurately judge the heat storage characteristics,distribution range and the optimal location of drilling in the tectonic belt.Because the suppling rate of geothermal is low,it causes economic waste and construction period.The types of geophysical exploration methods are multitudinous,they should be applied to different areas and geological structures,and combine them organically to obtain the optimal technical solution.This can not only effectively delineate the geothermal target area,but also save exploration costs and improve work efficiency.A large area of granite is distributed in the exploration area of Antu Haigou,and the structures and water system at all levels are relatively developed.The structures at all levels provide conditions for the occurrence of water diversion channels,and the abundant water system provides an effective supply guarantee for geothermal water sources.Therefore,it is extremely important to determine the directivity relationship between surface water,geothermal channels and aquifers.That is,how to obtain the course of surface water source through the structure to the underground storage space,and determine the best storage space.Firstly,the reliability and geological characteristics of geothermal occurrence in the exploration area are preliminarily determined by infrared and aeromagnetic of remote sensing data.Secondly,the comprehensive geophysical exploration methods of resistivity composite profile and audio magnetotelluric sounding are used to obtain the geological structure characteristics from shallow to deep,and the water diversion channel?storage space are determined according to the distribution characteristics of the water system in the area.Finally,it is verified by drilling.Integrated geophysical exploration methods,from the surface to the deep earth,make a more comprehensive understanding of the stratigraphic structure.In particular,the audio magnetotelluric sounding method obtained the deep geoelectric structure characteristics in this exploration process that cannot be replace by other technical means.