THE HETEROGENEITY MODEL OF LOW PERMEABILITY RESERVOIR AND REMAINING OIL DISTRIBUTION——A CASE STUDY OF DUJIATAI OIL ZONE IN QI 9-HUAN 50 BLOCK, THE WEST LIAOHE DEPRESSION

Three macro-heterogeneity models of reservoir,interbedded,intraformational and planar,has been established for the Dujiatai reservoirs in Qi 9-Huan 50 Block in the West Liaohe Depression based on the dynamic and static data.And the distribution principle of remaining oil for low permeability(reservoirs) in the front of fan delta facies has been revealed.Moreover,the effect of macro-heterogeneity on forming and distribution of remaining oil has been discussed.Research shows that the macro-heterogeneity of this set of reservoir beds is apparent,that the vertical distribution of remaining oil within oil zones is controlled by interbedded and intraformational anisotropism and that the planar distribution is controlled by planar and intraformational anisotropism.