海上油田储采比变化规律研究

Reserve-Production Ratio Performance in Offshore Oilfield

储采比是评价油田开发程度的重要指标之一,预示着油田是否可以持续稳定开发,陆上油田对储采比的研究比较成熟,但海上油田相关理论研究较少。针对该问题,运用油藏工程和油藏数值模拟方法,得到储采比与储量替代率、递减率、开发时间、累计产量、采出程度和采油速度之间的关系式。将研究成果应用于渤海J油田,结果表明油田实际变化规律与理论研究一致:海上油田储采比与储量替代率呈正相关,与递减率成倒数关系。储量替代率不变时,稳产期末储采比越高,初始递减率越小;递减率不变时,储采比随储量替代率增长而升高。储采比与开发时间、累计产量、采出程度之间成双对数直线关系;与采油速度成反比关系。研究成果对油田寻找新的储量资源、确定挖潜时机、制订开发技术政策具有指导意义。

Reserve-production ratio is one of the most essential indicators to characterize the oilfield development level and steady development level,which has been widely and successfully used in onshore oilfields and rarely used in offshore oilfields.Reservoir engineering and numerical simulation were used to obtain the relation expressions between reservoir-production ratio and reserve replacement ratio,decline rate,development period,cumulative production,recovery degree and oil recovery rate.The research was applied to the Bohai J Oilfield,which shows a favorable agreement between actual and theoretical performances.The reserve-production ratio in offshore oilfields indicates a positive relation with reserve replacement ratio and an inverse relation with production decline rate.The initial production decline rate decreases with the increase of reserve-production ratio at the end of stable production period in constant reserve replacement ratio case.The reserve-production ratio increases with the increase of reserve replacement ratio in constant production decline rate case.The reserve-production ratio shows a double logarithmic linear relationship with development period,cumulative production and recovery degree and shows an inverse relationship with oil recovery rate.This research could provide certain guidance for the new reserve exploration,recovery timing determination and development technology policy preparation.