基于居里面深度对中国东北部大地热流的研究
Study on heat flow in Northeast China based on the depth of Curie surface
邱楠生 1许晴 1朱传庆 1宋佳霖 1李潇2
作者信息
- 1. 油气资源与工程全国重点实验室,中国石油大学(北京),北京,102249;中国石油大学(北京)碳中和示范性能源学院,北京,102249
- 2. 中国科学院大学地球与行星科学学院,北京,100049
- 折叠
摘要
大地热流值是表征地球热状态的重要参数,也是进行深部地温预测和评价一个地区地热资源的最基本数据.受钻孔测温的影响,盆地外的无钻孔测温地区缺少实测的大地热流值.目前的热流分布图都是依据相邻盆地的实测值进行插值绘制的,无钻孔区热流值可信度较低.由于岩石居里点与温度密切相关,可以通过居里面深度来研究地表热流值.本文依据东北地区现有的居里面深度分布图,结合实测的岩石热导率、岩石生热率数据和相应的地壳分层状况,计算了东北地区的大地热流值,重新绘制了中国东北地区精细的大地热流分布图.东北地区整体大地热流处于42.5～95 mW/m2之间,热流高值位于五大连池及敦化-密山断裂带海龙—牡丹江一带,松辽盆地内部、小兴安岭和长春-延吉缝合带也有局部的高热流值.热流高值与居里面隆起区域有较高的一致性,即居里面隆起处热流较高,而坳陷区热流较低.本次研究填补了中国东部地区热流实测值空白,为该区深部地温预测和地热资源评价提供了更加准确的参数.
Abstract
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.
关键词
居里面/大地热流/岩石热导率/岩石生热率/地热资源Key words
Curie surface/heat flow/thermal conductivity of rocks/rock heat generation rate/geothermal resources引用本文复制引用
基金项目
国家重点研发计划"变革性技术关键科学问题"项目(2021YFA0716000)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据