江汉盆地钻井地温测量和大地热流分布  

Borehole temperature logging and terrestrial heat flow distribution in Jianghan Basin

作　　者：徐明[1,2] 赵平[1] 朱传庆[1,2] 单竞男[1,2] 胡圣标[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国科学院研究生院,北京100039

出　　处：《地质科学》2010年第1期317-323,共7页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金项目(编号:40672197)资助

摘　　要：盆地的稳态温度是分析地温场和大地热流的基础,是盆地构造热演化的必要前提。本文根据最新获得的9口钻井的稳态温度数据和124块岩石热导率,结合已有资料对江汉盆地地温梯度和大地热流进行了系统分析。结果显示江汉盆地热流41.9～60.9 mW/m^2,平均52.3mW/m^2,盆地总体表现为较低的大地热流,反映了中新生代以来构造活动逐渐减弱,盆地不断冷却的结果;从盆地内热流分布看,热流分布南高北低,反映了江汉盆地构造活动的不均一性。Based on the newly obtained borehole steady temperature data from 9 holes together with thermal conductivities of 124 core samples, we analyze the distribution of geotemperature and terrestrial heat flow in Jianghan Basin. The present temperature gradients vary from 28.36 to 39.32 ℃/km,lower temperature gradients is observed in the Cenozoic Basin margin and higher gradients are obtained in the Cenozoic Basin. The determined thermal conductivity values vary from 0. 882 to 6.78 W/m · K and the calculated heat flow values in Jianghan Basin range from 41.9 to 60. 9 mW/m^2, with a average of 52. 3 mW/m^2. It shows that the influence of tectono- thermal event before Cenozoic in Jianghan Basin has faded away,and the basin has cooled down.

关 键 词：钻井地温测量 地温梯度 大地热流 江汉盆地 

分 类 号：P542[天文地球—构造地质学] P314.2[天文地球—地质学]