基于水平井网模式下的心滩内部夹层定量表征

Quantitative characterization of inner interlayer in braided bar based on horizontal well pattern

由于海上油田井距大、取心资料少,且水平采油井居多,其储层构型研究较陆上油田难度大,因此水平井网模式下的储层构型研究较少。文中以渤海L油田为例,利用测井资料、录井资料、水平井动态生产资料,总结了落淤层、沟道泥岩的测井识别方法,形成测井识别图版;并运用动态资料刻画夹层展布,"两段式""一段式""均匀式"含水率上升规律验证了夹层刻画的准确性。平面上,将渤海海域L油田馆陶组Ⅲ油组心滩分为迎水滩、背水滩、主体区及翼部;纵向上,将心滩分为垂积体、落淤层、沟道泥岩,渤海海域L油田落淤层、沟道泥岩以泥质夹层为主。文中通过对心滩内部夹层的精细表征,总结了剩余油分布模式,预测了剩余油分布的范围及储量规模,为L油田中后期高效开发奠定了基础。

Due to large well spacing,little coring data,and more horizontal wells in offshore oilfield,it is more difficult to study the reservoir architecture than that of onshore oilfield.Therefore,there are few studies on the reservoir architecture based on horizontal well pattern.Taking Bohai L Oilfield as an example,this paper summarizes logging identification method of fall silt layer and channel mudstone,and forms an interlayer recognition template by the logging data and dynamic production information of horizontal wells.The interlayer distribution is characterized by dynamic production information.The accuracy of interlayer distribution is verified by the difference of water-cut rise rules which includes"two-stage"and"one-stage"and"even"pattern.In the plane,the braided bar ofⅢoil group of Guantao Formation in Bohai L Oilfield is divided into upstream bar,downstream bar,main bar and wing bar.In the vertical,the braided bar is divided into sedimentary body,fall silt layer,channel mudstone.The fall silt layer and channel mudstone in Bohai L Oilfield are dominated by muddy interlayer.Based on the precise characterization of inner interlayers in braided bar,the remaining oil distribution pattern is obtained and the range and scale of remaining oil distribution are predicted,which provides a foundation for the efficient development of L Oilfield.