Study On Remaining Oil Distribution And Tapping Potential Of Paleogene In Caozhuang Oilfield

The oil-bearing strata of the Caozhuang oilfield are Paleogene strata belonging to complex small fault block reservoirs with many fault blocks,many oil bearing strata,small oil bearing areas,and large differences in physical properties of oil reservoirs.In the field of oilfield development,there are many problems such as large number of out of control reserves,large difference in output between layers,poor adaptability of well pattern and low level of water flooding controlIn order to further improve the recovery rate of the block,the research ideas of"consolidating,adjusting,governing and tapping the potential"in old areas.Based on the method of single-well facies analysis,analysis of cross-section profile and the characteristics of plane distribution of sedimentary microfacies,we studied the development effct of oilfield.Sedimentary facies are distributary channel and floodplain deposits in the fan delta plain.The cross-section of the coal-bearing facies is in the direction of the provenance and is dominated by fan delta front facies deposition.This paper evaluates the development effect of Caozhuang oilfield by reservoir utilization,recovery rate and water injection effect.The characteristics of remaining oil distribution in Caozhuang Oilfield were studied by comprehensive analysis of development geology and dynamic comprehensive analysis of reservoir engineering.The remaining oil in plane is mainly concentrated in E₂d₂^1-3,4 in Cao 13and E₂d₂^5-6 in Cao13;E₂d₂¹、E₂d₁¹,E₂d₂^2-6,8 and E₂d₂^2、3 in Cao13 fault block.The remaining oil mainly accumulates in the lower layers of E₂s₁^5-4,E₂s₁^7-5,E₂d² and E₂d₁.Based on the characteristics of remaining oil distribution,adaptability evaluation of potential tapping technology was carried out and a comprehensive adjustment plan for tapping potential was formulated.E₂d₂⁵ and E₂d₁ were divided into one well pattern development（lower well pattern）in Caonan fault block and E₂d₂²⁴ combination well network（upper well pattern）;E₂s₁ in Caobei old wells to review the work to strengthen the electricity of the water layer,drilling the same layer and weaking water flooded wells vertical and horizontal remaining oil tapping work.E₂d₂⁵ in Cao Bei strengthen the injection and production of oil and gas wells to improve the effect of waterflooding development as the center of the oil and gas wells and to achieve stable oil production in Caozhuang oil field.Through the above work,the fine excavation potential of the Paleogene reservoirs in the Cao Zhuang oilfield,the combination of the dynamic and static data and the multi disciplinary synergy are used to clarify the main factors that affect the distribution of the remaining oil.The water flooding characteristics and the distribution status of the remaining oil in the Cao Zhuang Oilfield are clarified,and the adjustment countermeasures for the next step are formulated,and the maneuverability adjustment suggestions and measures are put forward.