松辽盆地大地热流

本文以65个井温数据、并从中测试了10个大地热流值为基础,阐述了松辽盆地的地温场为中部高边部低,并呈环状分布的高地温场特征;进一步阐述了盆地的地壳热结构,分区估算了盆地下面沉积岩层、花岗岩质层和玄武岩质层各层底部的温度和热流值;分析了盆地的地温场高的主要因素以及地温场与岩石圈、重磁力场的关系

GEOTHERMAL HEAT FLOW IN THE SONGHUAJIANG-LIAONING BASIN

Terrestrial heat flow values of 10 drill holes have been obtained based on the data of well logging of 65 samples,and heat conductivity of 43 samples from these core were measured.The Sungliao Basin is not only characterized by comparatively high geothermal field,but also shows well defined regionalization.The general aspect of the geothermal field is distributed as follows both terrestrial heat flow and geothermal gradient or stra-tigraphic temperature show high in inner part of basin and it is decreasing towards outer sides.The geothermal field is characterized by the high in inner part and low in outer side and shows a ring distribution.The geothermal structure of the basin is also discussed.The temperature and heat flow in the bottom of the sedimentary and granitoids and basalt layers under the basin are estimated in accordance with different regions.We tried to analyse the factors inducing the high geothermal field of the basin.They may be as follows:1.Mantle uprising and crustal thinning 2.The high rate of heat production owing to wide distribution of granites 3.The basin is situated in the rift system of eastern China,where geothermal activity is high and 4.The basin belongs to a closed type and is favourable to preservation of heat.Finally,an analysis is made on the relation between geothermal field and lithosphere,gravitational and magnetic field