摘要
地热场主要受基底凸凹相间的地质构造格局控制,具有高低相间的带状分布特点。在凸起区盖层地温梯度G和大地热流值Q均较高,一般G=3.5—5.0℃/100m,Q=63—84mW/m^2;而凹陷区则较低,G=2.7—3.5℃/100m,Q=46—59mW/m^2。全区=3.58℃/100m,=61.5±13.4mW/m^2,这说明全区具有较高的地热背景值和局部热异常。地热场数学模拟结果和实测地热资料对比,相符较好。构造单元的地热差异,主要是由于地壳浅部岩石热性质在横向上及纵向上的不均一,地壳深部较均一的热流在向上传导过程中,于地壳表部再分配的结果。
The geothermal field is mainly controlled by the regional tectonic framework characterized by alternately upwarped and downwarped basement, and exhibits the characteristics of belted distribution with alternating high and low relief The geothermal gradient (G) and terrestrial heat flow velue (Q) of the Cenodoic sedimentary cover are relatively high in the upwarped area, with G=3.5-5.0℃/100m and Q=63-84 mW/m^2; whereas in the downwarped area they are relatively low, with G=2.7—3.5℃/100m and Q=46-59mW/m^2. The geothermal background values are relatively high in the whole region, with =3.58℃/100 m and =62.5±13.4mW/m^2, and geothermal anomalies occur in some areas. A comparison of the results of mathematical simulation of the geothermal field with the measured values shows a good agreement between them. The differences of the geothermal characteristics in various structural regions are mainly caused by the great vertical and horizontal variations of thermal properties of rocks in the shallow levels of the crust, This phenomenon can be regarded as the result of redistribution of relatively uniform heat flows in the surface part of the crust by means of their conduction from the deep level of the Earth's crust.
出处
《地质学报》
EI
CAS
CSCD
北大核心
1990年第1期80-91,共12页
Acta Geologica Sinica
