Abstract:

Himalayan orogeny is the main period of tectonic deformation and finalization of structures,as well as occurrence of abnormal high pressure and hydrocarbon accumulation in Kuqa foreland basin.Based on analysis of tectonic deformation and rock memory information,Himalayan movement in Kuqa foreland basin can be divided into three stages,corresponding to the end of Oligocene,the end of Pliocene and the end of early Pleistocene,with compressional intensity progressively strengthening and reaching peaks in late Himalayan.The neotectonics since middle Pleistocene mainly result in two or three uplifts,relatively weak folding and thrusting,and destruction of hydrocarbon accumulations in the area.Structural deformation in Kuqa foreland basin have been developed since early Himalayan,and the structural zones have successively been developed later and later southwards,which control the zonal distribution patterns of thrust folds,structural traps and oil and gas pools.The strong lateral compression in late Himalayan orogeny is the main factor leading to the abnormal high pressure,and the main controlling and driving forces for hydrocarbon migration and accumulation.Himalayan orogeny destroys and adjusts,to some extent, oil and gas reservoirs in the area.

Key words: Himalayan orogeny, petroleum geological significance, hydrocarbon accumulation, Kuqa foreland basin