塔河油田油藏的储渗空间主要由大小不等的溶洞、裂缝、溶蚀孔洞、微裂缝组成,非均质性严重,油水关系复杂。2005年在塔河奥陶系主体部位开展注水开发先导试验,取得了较好的效果;提出了缝洞型油藏的注水开发机理,注水后地层压力恢复0.4MPa,自然递减率降至18%;累积增油52.6×104,占阶段累积产油量的12.2%;采收率提高4.1%,可采储量增加414×104t。 The reservoir space of Tahe Oilfield is mainly composed of karst caves, fractures, dissolved pores and micro-cracks of different sizes with serious heterogeneity and complicated oil-water relations. In 2005, pilot test of waterflooding development was carried out in the main part of Ordovician in Tahe, and good results were obtained. The mechanism of waterflood development in fractured-cave reservoirs was proposed. After waterflooding, formation pressure recovered 0.4MPa and natural decline rate dropped to 18% ; Cumulative oil increase 52.6 × 104, accounting for 12.2% of the cumulative oil production; recovery rate increased 4.1% recoverable reserves increased 414 × 104t.