Sifangtuozi area is the key project for Jilin Oilfield to submit reserves and raise efficiency recently,but there is no breakthrough of Yaojia Formation due to the poor knowledge of scientific theories. Based on the data from 147 exploration wells and 300 development wells,focused on core observation from 25 coring wells,combined with petrological characteristics,sedimentary structures, seismic sections and modern sedimentary cases,the formations,sedimentary features and exploration prospects of the shallow...