特低渗油藏水平井开发效果评价及影响因素研究

Study on Influencing Factors and Development Effects of Horizontal Well on Extra-low Permeability Reservoirs

通过安塞油田延长组长10段和长6段沉积微相、储层物性、储层岩性、微观孔隙结构、油层厚度、微裂隙发育状况、压裂效果等建立低渗透储层评价体系,结合已开发水平井完井方式、生产动态,将安塞油田特低渗储层分为4大类6个小类,结果表明,在现有技术水平下,Ⅱ类以上储层适合水平井开发,通过开发效果分析,讨论了影响水平井开发效果的主要因素。

Based on the sedimentary facies,reservoir property,pore structure,reservoir thickness,fracture and fracturing effect,the system for evaluation of low permeability reservoirs was established.In combination with the horizontal well completion and production dynamics,the low permeability sandstone reservoirs of Ansai Oilfield in Ordos Basin were divided into four types and six sub-types.The results indicate that the reservoirs better than Ⅱtype are suitable for oil development through horizontal well.By analysis of the oil development effect,the main factors affecting the horizontal well development are discussed.