Study on the Development Characteristics of Low Permeability Sand-stone Reservoirs of Chang2 Layer in Wangjiawan Area,Ordos Basin
[Purposes]The efficient development of low-permeability sandstone reservoir is an important link for the stability and increase of crude oil production.In order to ensure the stable production and production increase of crude oil in the low-permeability Chang2 storage sandstone in Wangjiawan area,Ordos basin and provide reference for the efficient development of the same type of reservoir,it is neces-sary to analyze its development characteristics.[Methods]This paper using microscopic analysis,gas test permeability and sensitivity test to analyze the static reservoir characteristics of low permeability res-ervoir sandstone.The development characteristics of low permeability sandstone reservoirs are analyzed by means of fluid property detection,water flooding and relative permeability tests combined with dy-namic production data.[Findings]The results show the low permeability reservoir sandstone of Chang 2 member in Wangjiawan area mainly develops medium-fine grained weak hydrophilic-hydrophilic feld-spar sandstone,and intergranular pores are the main oil storage space.The fluid is mainly low density,high wax crude oil and weak acid and high mineral degree Na2 SO4 formation water,and the reservoir is mainly elastic-dissolved gas drive oil-water mixed storage structure-lithologic reservoir with low natural capacity and high water rate.[Conclusions]The water injection development of low-permeability stor-age sandstone should pay attention to the early energy supplement,the dynamic adjustment of water in-jection and the selection of profile regulation and flooding technology.
Wangjiawan arealow permeability sandstone reservoirsoil reservoir development character-isticsreservoir characteristicsfluid characteristics
万方数据
维普
