Abstract: Hydrocarbon show in Tanzhuang-Shenqiu sag indicates active hydrocarbon and displays the characteristics of multiple wells and whole horizons.There are 22 exploration wells in the area and different levels of oil and gas shows can be seen in 16 wells in permo-carboniferous,lower cretaceous,paleogene and neogene.According to the physical characteristics of crude oil,compounds,crude oil,and the oil sources correlation of light hydrocarbon components and biomarker compound indexes of carboniferous Permian and lower cretaceous hydrocarbon source rocks,the crude oil in lower cretaceous is of mixed source characteristics.Among them,the heavy hydrocarbon component of crude oil is from the lower cretaceous Yongfeng formation under the period of dark mudstone,and the light hydrocarbon component of crude oil is from coal and dark mudstone in upper palaeozoic.Studies have shown that lower cretaceous and the carboniferous Permian is the main exploration target strata in this area,and the self-generated and the lower cretaceous and the Paleozoic source-mesozoic reservoir accumulation combination is an important exploration area,which can provide important guiding role for gas exploration deployment in the next step.