Abstract: Based on well logs and performance data, integrated with core observation, deposition and diagenesis analysis, this paper builds up the geological model for Triassic reservoir and presents an interpretation of the sand connections in geologic origin. It is pointed out that the intercalated bed in Wellblock No.2 of Lunnan oilfield can be divided into calcareous one, fine self calcite cementing one and fine adjacent calcite cementing one. On the basis of the fine characterization of reservoir, the subdivided sequence development adjustment project of oil measure-I in this well block is proposed, and good results for application are obtained.

Key words: Lunnan oilfield, Triassic, reservoir, geologic modeling, reservoir description/characterization