基于居里面深度对中国东北部大地热流的研究OA北大核心CSTPCD

The heat flow is an important parameter that characterizes the Earth's thermal state and is also the most basic data for deep geothermal prediction and evaluation of geothermal resources in a region.However,due to the influence of borehole temperature measurement,there is no measured heat flow value in areas without borehole temperature measurement outside the basin.At present,the relevant heat flow values are obtained by extrapolating based on the measured values of adjacent basins.Due to the close correlation between the depth of the Curie surface and temperature,the surface heat flow value can be studied through the depth of the Curie surface.Based on the existing depth distribution map of residential areas in Northeast China,and combining measured rock thermal conductivity,rock heat generation rate data,and corresponding crustal stratification conditions,this paper calculated the heat flow value and redraw a detailed map of the heat flow distribution in Northeast China.The overall heat flow of the Northeast region is between 42.5 and 95 mW/m2,the high value of heat flow is located in the Wudalianchi and Dunhua-Mishan fault zones,and there are also local high heat flow values within the Songliao basin,the Xiaoxing'anling and Changchun Yanji suture zones.The high heat flow value can correspond one-to-one with the uplifted area of Curie surface,that is,high heat flow at the raised area of the Curie surface but the heat flow in the depression area of Curie surface is relatively low.This study effectively fills the gap in measured heat flow values in Northeast China and provides more accurate parameters for deep geothermal temperature prediction and geothermal resource evaluation in the area.