The depth of Curie surface in Chuxiong Basin

Yunnan Province

is es-timated by application of aeromagnetic survey data.On this basis

the averagevalue of geothermal gradient of different regions in the basin is further calcu-lated.The result is that

geothermal gradients of the basin range from 1.4 to 3.9℃/100m

the average value is 2.8℃/100m.Three regions of high geother-mal gradient may be considered to be promising areas for hydrocarbon prospec-ting.