Cenozoic structural deformation of the Fusha-Keliyang area in the piedmont of the western Kunlun Mountains and its control on hydrocarbon accumulation

The Fushan-Keliyang area is situated in the eastern segment of the western Kunlun arc tectonic belt,providing key constraints for studying deformation characters of the western Kunlun piedmont thrust belt.Combined with geologic survey,drilling data and recent high-resolution seismic profiles,this study analyzed the Cenozoic deformation characters of the Fushan-Keliayang area.The present paper proposed that the studied area consisted of three ranges of structural belts from south to north,i.e.Fusha,Kekeya and Guman-Heshitag,of which the Fusha structural belt showed obviously lateral variations in configuration characters.Among these structural belts,the deformed timing of individual structural belts got younger northward,displaying characters of break-forward deformation.Within the each range of structural belts,deformation propagated from west to east.Based on the balanced section calculation,the total shortening of the Cenozoic structural belts in the Fusha-Keliyang area accounted for 54.5 km and the shortening rate was 35.9%.Therefore,the Cenozoic deformation greatly controlled hydrocarbon accumulation,and deep structures of the Fusha structural belts were considered to be the best target for hydrocarbon exploration.