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The Middle Submember of Member Three of Shahejie Formation of Paleogene (Es3~Z Member) in the west of Niuzhuang Sub-sag of Shengli Oil Field is the research object of this article. In this article, the porosity and permeability of the Es3~Z Member are statistically analyzed and calculated from well sampling of 19 typical wells in the Niuzhuang Sub-sag. Then the relationship between the physical property and oil-bearing of reservoir are studied. Finally, Studies suggest: ① Secondary Interstice are the main interstice and Original Interstice develops not well. The distribution of the pore throat is uneven and partial small. So the rock porosity and permeability is not well. ②The average value of porosity is approximately 15.4%. And there is mostly middle-low porosity, some extra-low porosity and few high porosity reservoir. ③Extra-low and low permeability reservoir is the main reservoir(71.9%) and middle permeability occupy a certain proportion of 27.5%, but high-permeability reservoir are rare. The average value of permeability is 0.65-17.8 ×10 -3 μm 2 . ④ Lower limit of physical properties are as follow: In oil-bearing reservoir the bottom limit of porosity is 7% and permeability is 0.1×10 -3 μm 2 . While in oil reservoir and better reservoir the bottom limit of porosity is 12.5% and bottom limit of permeability is 1×10 -3 μm 2 .

Study on the Characteristics of Physical Property and Oil-bearing of the Es3~Z Member of Niuzhuang Sub-Sag of Shengli Oilfield