Coupling research of event deposition and Qinling orogenesis of late Triassic,South Ordos basin

South Ordos basin is the chief target of increasing resources and production,which has plenty of petroleum resources.There is intimate relationship between lacustrine basin infilling and Qinling orogenesis of late Triassic because of much event deposition and exploring achievements which are found in Yanchang formation at present,so it is a bias distortion if Qinling orogenesis is broken away from sedimentation of Yanchang formation.In order to resolve coupling problem of Qinling orogenesis and Yanchang formation sedimentary,we analyze outcrops,well cores,sedimentary area and source area.It is showed that source area uplift,orogenesis belt front subside,lake level rise and partly transgression are resulted by Qinling orogenesis of late Triassic.Slump turbidite are caused by unstable gravity from delta front in south ordos basin because of asymmetrical basin which south is steep and north is slight slope.Volcanic erupt along with Qinling orogenesis results in changing biologic groups,on the other hand,biologic groups are flourishing because of eutrophy of tuff,and finally facilitate the formation of superior source rock.The study of coupling relationship has a guiding significance when we looking for hydrocarbon source rocks,judging the sedimentary facies,determining the tectonic background and it is also useful to the exploration of oil and gas.