Abstract: From the very start of the development of Daqing oil field,we have spared no effort in collecting all available geological data,studying carefully the reservoirs and making detailed correlation of minor pay sands and researches in the sedimentary fades of reservoirs,so as to get a clear knowledge about the distribution of sands and their variations in heterogeneity,This serves as the basis for making divisions of the pay zone and working out plans of well pattern and water-flooding.Recovery by water-flooding for pressure maintenance was adopted from the initial stage of development,and injection,reconstruction,plugging,testing and production of each of the multizones are carried out according to the character of oil and water movement.After twenty years of production,we have been able to recover more than 34% of the oil in place in some of the blocks and to maintain the initial reservoir pressure.In the pay zones where pure oil is produced,all the wells are still kept on flowing with output for a single well even higher than in the initial stage and their rate of recovery over 2%.

摘要： 大庆油田是世界上特火油田之一,是陆相多油层砂岩油田,油层非均质性十分明显.原油属石蜡基原油,含蜡量高达20-30%,脱气原油凝固点为25-30℃.地下原油粘度5-10厘泊.边水不活跃.油田于1960年6月投入开发.1976年油田全面开发,年产油量达到5000万吨,已稳产四年(图1).1979年底累计采油量4.75亿吨,综合含水54.5%.累计向油层注水8.8亿米³,累计注采比0.91.向国家累计上缴利润和税金近500亿元,经济效果是比较好的.