Optimization Of Production Area Of Chang 4+5 And Chang 6 Reservoirs In Hujianshan Oilfield

Hujianshan oilfield is located in the west of Northern Shaanxi Slope Belt in Ordos Basin.In recent years,with the increase of exploration and development,several Chang 4+ 5 and Chang 6 reservoirs have been found in Hujianshan oilfield,the favorable areas have been continuously expanded and gradually connected,and the geological reserves have increased significantly.At present,Chang 4 + 5 and Chang 6 reservoirs in Hujianshan oilfield have great potential to increase reserves.However,from the trial production situation and the implementation effect of productivity construction,there are many high-yield well points,small area of single reservoir,poor connectivity,large differences in different reservoir characteristics,rapid changes in physical properties in the same reservoir and large differences in productivity of single wells,showing the impact on Chang 4 + 5 The reservoir forming process and oil-gas distribution law of Chang 6reservoir are still unclear,which needs further research.By depicting the sedimentary characteristics,reservoir structural characteristics,sedimentary environment and sand body spatial distribution characteristics of Chang 4 + 5and Chang 6 in Hujianshan oilfield,this paper finds out the reservoir forming law of Chang4 + 5 and Chang 6 reservoirs in Hujianshan oilfield.Through the secondary fine processing and interpretation of logging,the secondary interpretation template of layered position,sub region and reservoir type is established,the reservoir rock ore combination,fluid type and pore structure characteristics are obtained,and the reservoir performance and fluid properties of sandstone are objectively evaluated.On this basis,the distribution range,scale and reserve grade of the reservoir are deeply studied,which provides solid and accurate basic data for reservoir evaluation,favorable area classification and production dessert area optimization,establishes the favorable area classification and evaluation standard of Chang 4 + 5-Chang 6 reservoir in Hujianshan oilfield,classifies the production favorable areas,and points out the direction for high-efficiency production construction of Chang 4 + 5 and Chang 6 reservoirs.