Abstract: Geological modeling is the basis work of oilfield development.Because of offshore oilfield's spe-cial geographical position,a few wells were drilled,bringing difficulty to gain data and great challenge to early development of oilfield.In this paper,taking Guanjiapu development area as an example,it is pro-posed that under the guidance of geology concept model,reservoir lithology model can be established by synthesizing mang disciplines,using stochastic simulation theory,combining with reservoir constraint in-version and geological modeling.Under the control of lithology model,reservoir parameter modeling can be realized.Based on the establishment of 3D geological model,prediction curves along design well track direc-tion can be used to guide drilling wells in complex structure wells.By using this modeling method and re-sult,the uncertainty of reservoir prediction wells and development risks,which has get great effect in prac-tice.This modeling method provides very good reference to wide well pattern offshore development.