柴达木盆地现代大地热流和深部地温特征

Research on Heat Flow and Temperature Distribution of the Qaidam Basin

根据实测岩石热导率和测温资料计算了柴达木盆地的大地热流值并编制了热流分布图 ,对 47个测点的热流值进行了统计 .根据岩石热导率、热流值、岩石放射性生热率实测数据计算了研究区深部温度 ,并在此基础上编制了盆地第三系和第四系底界温度分布图 .结果表明 :研究区热流值平均为 (52 .6± 9.6) m W/m2 ;热流分布具有东北低 ,中西部高的特点 ,且主要受构造运动的控制和沉积作用的影响 .深部温度与地层分布密切相关 ,第四系底界温度最高达 1 0 0℃以上 ,第三系底界的温度最高可达 350℃以上 .

Heat flow was calculated and heat distribution diagram was made based on the measured data of thermal conductivity and heat production in Qaidam Basin. Statistics of heat flow values for 47 measured points was carried out. The temperature at depth of the research area was researched according to the data of thermal conductivity, heat flow value, and radioactive heat generation ratio. On the basis of this, the temperature distribution maps for the bottoms of Quaternary and Tertiary were compiled. The result shows that the average values of heat flow is (52.6±9.6)mW/m 2, characterized by a low value in north east and a high value in central west; and it is controlled mainly by tectonic movement and influenced by depositional process. The temperature in depths is closely related with the distribution of strata, with the bottom of Quaternary being higher than 100℃, and the bottom of Tertiary, 350℃ in its highest.