Application research of comprehensive geophysical exploration method in geothermal resources survey in a region of Inner Mongolia
With the rapid development of economy and the increase of people's awareness of environmental protection,geothermal as a natural,clean and renewable green energy has received more and more attention.Based on the analysis of structural and hydrogeological conditions in a certain area of Inner Mongolia,it was considered that there was a good geothermal storage and transportation channel in this area,and then two geophysical methods of 2D seismic exploration and audio magnetotelluric were carried out in this area.The differ-ence of seismic wave impedance was used to explain geological stratification.The resistivity difference and volume effect of magnetotellu-ric sounding were used to determine the location and thickness of aquifer and thermal reservoir.Through comprehensive comparison and interpretation,it was believed that the low electrical resistivity in the area was closely related to the high water content in sandstone pores and fractures.It was determined that the Middle Upper Neogene strata of the Neogene were good aquifers in the area.The thick-ness of the formation was about 1 600 m,and the main thermal reservoir was determined by combining the regional geothermal well da-ta.Therefore,the two different geophysical exploration methods have achieved good results in the comprehensive application of geother-mal resources investigation.
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