Chuxiong Basin is a Mesozoic basin located in central Yunnan.The basin developed into two sag one uplift palaeogeographic pattern.A uncompensated oil generation sag formed when foredeep basin rapidly subsided

and back-bulge basin developed into a semi-restricted oil generation sag under the blockage of foreland uplift.The reservoir rocks in the basin could be divided into three types:1.turbidite in the foredeep belt and the back-bulge basin;2.continental clastic rocks of fluvial

deltaic

littoral shallow sea facies on two sides of the foreland uplift and the margin of the bulge basin;3.carbonate ramp on the foreland uplift facing the sea.Foreland thrusting towards Yangtze craton started in Latinian stage

thus resulting in fault-bended fold trap

fault-propagated fold trap

step thrust-lithologic trap

basal detachment trap

the subducted belt fold trap in nappe front.The emplacement of foreland thrust belt improved hydrocarbon migration and preservation

it acted as the heat source and dynamic force of hydrocarbon maturation and migration.Hydrocarbon exploration in Chuxiong Basin will show broad prospects.