Abstract:

Currently, most of the flow unit divisions are only based on such static parameters as lithology and physical property, which make the division results deviate from the actual production practices.Besides, the verification method of the flow unit is single.In order to put forward a more reasonable division method of flow units, Yan 9¹ oil reservoir in Yang 19 block of Suijing Oilfield was taken as an example.Five groups of static parameters and three groups of dynamic parameters were selected to divide the flow unit of Yan 9¹ reservoir more accurately.By applying the Q type hierarchical clustering analysis method to each parameter, the reservoir can be divided into four types of flow unit including type A, type B, type C and type D.And the hit ratio of the result from discriminant analysis is 99.3%.The rationality of the results was demonstrated in respects of seepage characteristics, heterogeneity and spatial correlation, improving the verification method of the flow unit.The division results show that the physical characteristics correlate well with dynamic productions of each flow unit, indicating the rationality of the division of flow unit.The research shows that the flow units of Yan 9¹ reservoir are dominated by type B.The type A and type B units may be the emphasis of residual oil development.

Key words: flow unit, residual oil, Yan'an Formation, Suijing oilfield, Ordos Basin