Study On The Remaining Oil Distribution Based On Geologic Model Of Single Sand Body In Gao Shangpu Oilfield

Ji Dong Oil Field is a typical complex little fault-block oil field, which has many faults, small fault block area, strong heterogeneous reservoir in fluvial facies, multiple oil bearing formations and complicated relationship of oil and water. After been developed for many years, some blocks have come into the intermediary and later stage of extra high water cut, the oil and water relationship becomes extremely complicated and more difficult to develop. The distribution of remaining oil is controlled by the single sand body in fault-block oil reservoir.This paper studied on the six typical main layers of fault block Gao 29 of shallow layer Gao Nan in Ji Dong Oil Field. Based on the study of oil reservoir geological property, the characteristics of the complicated fault-block oil reservoir development at extra high water cut stage are summarized by applying the oil reservoir engineering method on the analysis of field production data, kinds of monitoring data, static data and testing data. Moreover, the outstanding issues are revealed, such as extremely imperfect injection-production system, low control degree of water drive reserves, and highly unequal reserves producing. Considering the geological character of complicated fault-block oil reservoir and beginning with the controlling factors of the remaining oil's forming and distributing, the numerical reservoir simulation based on the 3D geological modeling of the single sand body was carried out to characterize the distribution of remaining oil in the single sand body vertically and horizontally. It shows that on the top of the single sand body and inside controlled by the interbedding are rich accumulations of remaining oil, which have been classified into four types and quantitatively evaluated. Through the above study, the efficient measures of further extracting remaining oil are put forward according to the problems existing in the development practice, which has important theoretical and practical guidance to the development of remaining oil and slows down the decline of production.