三角洲前缘韵律层特高含水期剩余油分布及调整

Residual oil distribution and reconciliation for delta front rhythm zone in extra high water cut stage

注水开发后期胜坨油田三角洲前缘反韵律厚油层剩余油分布复杂。对胜坨油田沙二段8砂层组三角洲前缘储层沉积特征、非均质性及剩余油分布规律研究表明,受注采、储层沉积特征等因素影响,三角洲前缘储层剩余油主要集中在坝主体的上部以及坝侧缘、远砂坝沉积的韵律层。在储层剩余油分布研究基础上,有针对性地采取细分韵律井网调整及配套挖潜措施完善潜力韵律层注采系统,可以有效提高开发后期三角洲前缘反韵律厚油层水驱开发效果。

Residual oil distribution is complicated in the thick reverse rhythm reservoir in the delta front of Shengtuo oilfield in late waterflooding stage.The study of sedimentary characteristics,heterogeneity and residual oil distribution in the delta front reservoir,Sand Unit 8,Sha 2 member,Shengtuo oilfield shows that the residual oil mainly concentrates in the rhythmic bedding of upper bar,bar edge,and distal bar sedimentation as affected by injection-production and sedimentary characteristics.The waterflooding response in thick reverse rhythm delta front reservoirs in late development stage can be improved by employing fine division of the rhythms,pattern adjustment and stimulation measures to improve injection-production system on the basis of residual oil distribution study.