关键词: 地热场, 大地热流, 地温梯度

Abstract: This paper provides 14 values of-geothermal heat flow obtaind from the geothermal measurement of 26 wells. Based on these data the characteristics of the geothermal field in Yunnan region have been described as follows: Either the distribution of geothermal heat flow, or the variation of temperature gradient displays high value in the west of Lancangjiang river, the northern segment of Honghe fault zone, as well as Kunming and Eshan region. Low value occurs to the east of Xiaojiang fault zone in eastern Yunnan, and also in the region between the Xiaojiang and Honghe fault zones, including Chuxiong, Binchuan and Xiangyun. In other words, the geothermal field in Yunnan Province is characterized by high value in the west and low value in the east of the region, showing a tendency of gradual decreasing from the west to the east.The high value of geothermal heat flow in Yunnan region can be attributed to the fact that it lies in the transitional belt between two major siesmic zones in the world. The Yunnan region is similar to island arc in high value of geothermal heat flow and violent Cenozoic tectonic movement. Most of the strong earthquakes occurred along deep large fault zones, which has causative relation with current movement of earth's crust and plate tectonic motion.An analysis has been made on the inhomogeneity, which affects the development and occurrence of earthquake, in different tectonic units from the west to the east of Yunnan region. There are a good correspondence relation between the distribution of geothermal field and those of hot springs and earthquakes.

Key words: Geothermal field, Terrestrial heat -flow, Geothermal gradient