THE HEAT FLOW FIELD IN ORDOS BASIN,NW CHINA
SUN Shaohua;LIU Shunsheng;WANG Jiyang(Changsha Institute of Geotectonics, Academia Sinica, Changsha 410013).(Institute of Geology, Academia Sinica, Beijing 100029)
This paper focuses on the heat flow field of Ordos basin, NW China,by combining experlrnent methods of U,Kand Th, heat generation, etc. In the light of the comprehensive study of the experimental data and layer divisions of the crust,the average heat flow of Moho in Ordos basin is 0.37 HPU,much lower than that(0. 64～0. 97 HFU)in North China basin or that(1. 19 HFU) in Songliao basin, NE China, showing the characteristics of the heat flow field of the stable cratonic basin. The average heat flow on the crust surface of the basin is about 1.446 HFU,similar with that in Mesozoic diwa orogeny of the world, probably indicating that the diwa stage is soon expected in the basin. The interfaces from Moho to the surface in Ordos basin have the same heat flow distribution-style with their high anomaly in the SE part,low anomaly in the NW part and NE-trending transition zone from Wuqi to Jingbian. In the transition zone,the geothermal dynamics plays the most important role for accumulation of petroleum.
【CateGory Index】： P314.2