It is indicated from drilling that Chepaizi swell is characterized by multiple oil-bearing zones,multiple reservoir types and multiple oleaginous grades.

On the basis of study of the geologic structure,sedimentary microfacies and reservoir property,it can be concluded that the Mesozoic reservoir types in Zhidan oilfield include structural-lithological reservoir,structural-hydrodynamic reservoir and lithological reservoir.

The efficiency of sidetracking is closely related with reservoir type and sidetracking target.

Study on sedimentary characteristic and oil reservoir types of lower Ed in the eastern slope of Chengdao oilfield;