Heterogeneity Characterization Of Deltaic Sandbody Of Sa'ertu Putaohua Formation Of Sabei Oilfield

The development practices show that there still exists certain unworkable or oil saturation oil in the deltaic front facies reservoir after entering the high water cut stage,which exists because of the heterogeneity of reservoir. Fluvial-deltaic deposits of La-Sa-Xing oilfield develop several deltaic front facies sandbodies,which are not only complex in shape but also many kinds of origins. In inner front facies develops the branched deltaic sandbody,transition deltaic sandbody,mass deltaic sandbody,mass deltaic river mouth depositional sandbody; In outer front facies develop the stable outer front facies sheet sand with developed main body facies belt,transition outer front sheet sand and unstable outer front sheet sand. The geological workers of oil field development have developed a set of description technique of sand body heterogeneity for different types of deltas in studying the large fluvial-deltaic depositional deltaic sandbodies,which has effectively guided the development principle formulation of the oil field in different development stages. The emphasis of the research is to recognize and classify the single sandbody,describe the interbedded layer and establish the 3D geological model aiming at the deltaic reservoir of Putaohua formation in N3 area of Sabei oil field by core and logging curve analysis of dense well pattern based on the deltaic depositional theory and formation correlation. The research realizes the aim of describing heterogeneous reservoir of deltaic sandbody,and bring the reservoir description technique into a high level,providing the geological basis for tapping the potentials of this kind of reservoir.