确定中、新生代沉积盆地大地热流的方法

用传统的方法于年青的沉积盆地测试大地热流,存在的问题多且难度大,因而这些盆地一直是世界热流测试研究最薄弱的地区之一。本文在符合热流测试原理的前提下,尝试用一种较容易确定热流值的方法,虽然这种方法获得的数据是近似值,但是可以接受的,并有地质、地球物理意义。也简要论述在新生界盖层地温梯度图的基础上,确定一个合理的系数,即盖层的平均热导率值,将地温梯度图转换为热流图,用以反映盆地地热的基本面貌。

METHOD FOR DETERMINING TERRFSTRIAL HEAT FLOW IN MESO-CENOZOIC SEDIMENTARY BASINS

A Method of determining terrestrial heat flow in oil fields from the temperature data of oil-bearing layers, electric logs and thermal conductivity of cover rock samples has been tried in the Mz + Cz sedimentary basin of North China in this paper. The average heat flow values so determined for five oil fields in the central part of Huanghua depression and three deep-trough areas of Jiyang depression are 56.2-61.5 mW/m2 and 57.4-58.6 mW/m8, respectively. These results are compared with the observed heat flow values obtained in these areas and show good agreement between them.Also, a method of compiling regional heat flow map on the basis of a good quality map of geothermal gradient of sedimentary cover and determining a reasonable mean thermal conductivity value of cover brief are discussed in this paper. This heat flow map can be used for basically reflecting the regional heat flow distribution pattern in whole sedimentary basin, North China.The mean value of the heat flow and the regional heat flow map we got in the North China basins are resonable and believable. A more significant outcome of this experiment is that it demonstrates a quick and inexensive method of obtaining terrestrial heat flow values and compiling terrestrial heat flow map in the Mz+Cz sedimentary basins of China and the world