Study On The Characteristics Of Geothermal Water Occurrence And Water And Heat Migration In Zhenfeng Anticline

Geothermal water resources are a new type of renewable environmental protection energy,which has high development and utilization value.In order to be able to carry out the exploration work of geothermal water resources efficiently and accurately,improve the development and utilization efficiency,and promote the development of the country's economy and society,it is necessary to further systematically study the characteristics and migration laws of geothermal water resources.This article is guided by theories of tectonic geology,geochemistry,geothermal geology,and hydrogeology,and based on regional geological survey data,using hydrochemical analysis testing,hydrogen and oxygen stable isotope testing,and COMSOL Multiphysics software.Using a combination of field survey and indoor analysis,Taking Zhenfeng Geothermal Water in Guizhou Province as the research object,the authors systematically studied the geothermal water storage characteristics and water-heat migration rules of Zhenfeng anticline in Guizhou.Acquired the following aspects:?1?According to the analysis of regional geological data,regional geological structure,stratigraphic lithology,thermal storage characteristics,and field investigation data,geothermal water in the study area is mainly distributed near anticlines and faults,and the water temperature is 19?26.5?,which belongs to medium and low temperature geothermal resources.The reservoir type is a carbonate thermal mixed reservoir.The geothermal water is divided into three blocks,namely the walnut tree fault and the Zhenfeng anticline block,the Wanlan hot spring block,and the Dingtang hot spring block.?2?According to the analysis of water chemistry test data,the type of water chemistry in the study area is basically composite water,mainly HCO₃^--Ca²⁺·Mg²⁺and Ca²⁺-SO₄^2-·HCO₃^-.Hot spring hot water and cold spring water are mainly HCO₃^--Ca²⁺·Mg²⁺type,and geothermal well hot water is mainly Ca²⁺-SO₄^2-·HCO₃^-type.?3?According to the analysis of stable isotopes of hydrogen and oxygen,the locations of?²D-?¹⁸O all fall near the atmospheric precipitation line,which is the recharge of atmospheric precipitation infiltration.After deep circulation,it is heated by ground temperature to form hot water.?4?By drawing the Piper three-line diagram,we can see that the geothermal water in the area is suitable for estimating the thermal storage temperature using the Si O₂temperature scale,and the thermal storage temperature is in the range of 27??65?.?5?Using COMSOL Multiphysics software,a three-dimensional numerical simulation of geothermal water and water heat transport in the study area was performed.It can be known from the simulation that the geothermal water migration in the study area increases with the buried depth of the thermal reservoir and the pressure increases.The closer the same elevation is to the fault zone,the higher the water temperature and the faster the geothermal water movement speed.Under the action of water pressure,geothermal water moves upward from the deep along the walnut tree fault zone and other fault channels.Water-rock reactions continue to occur along the way to change the content of water chemical components,and it moves to the thermal reservoir,and some continue Through the rock layer with better water permeability and thermal conductivity,heat is transferred and transported along the fractured fracture zone,and finally exposed as a hot spring on the surface.