基于储层构型的三角洲前缘剩余油分布规律——以渤海湾盆地S油田东营组二段下亚段Ⅰ油组为例

Remaining oil distribution of delta front based on reservoir architecture: a case study ofⅠoil formation of E3d2L in S oilfield, Bohai Bay Basin

李俊飞 王鹏飞 尚宝兵 霍春亮 徐静

中海石油（中国）有限公司天津分公司，天津 300459

Tianjin Branch of CNOOC Ltd., Tianjin 300459, China

渤海湾盆地S油田东营组二段下亚段油藏为三角洲前缘储层，非均质性强，长期注水开发导致储层水淹样式多，剩余油分布复杂。在深入剖析三角洲前缘储层构型模式的基础上，利用动、静态资料分析储层构型及其控制下的储层质量差异对剩余油分布规律的影响。研究表明：层间隔层和层内夹层的存在，使得注入水分段水洗，水驱效果好；侧向隔挡体的存在，使得注入水无法驱替周围砂体，剩余油富集；层间非均质性造成层间干扰，注入水优先沿储层质量好的砂体运移，剩余油主要分布于薄层、低孔渗层中；坝主体受韵律性和重力分异的影响，剩余油分布复杂；水下分流河道以底部水淹为主，中上部富集剩余油；坝缘储层质量差，平面上易被旁超，形成大量剩余油。

As the lower secondary Dongying Formation in S oilfield, Bohai Bay Basin, is delta front reservoir, the reservoir has strong heterogeneity. Long?鄄term water?鄄flooding development leads to different flooding patterns, resulting in remaining oil distribution complex. On the basis of analyzing reservoir architecture model of delta front, controlling of reservoir architecture and reservoir quality on remaining oil distribution was analyzed by using static and dynamic data. It shows that injected water washes the oil layer in section because of the existence of interval layer and intraformational bed, making water flooding effect well. The presence of the lateral septum prevents the injected water from displacing its surrounding sand body and retains remaining oil. As the interlayer interference is easily caused by interlayer heterogeneity, and the injection water prefers to transport in the sand body with good quality, the remaining oil is mainly distributed in thin layer and low porosity layer. As main body of mouth bar is influenced by prosody and gravitational differentiation, its remaining oil distribution is complex. Flooding pattern is dominated in the lower part of underwater distributary channel, and large amount of residual oil is concentrated in the upper part. The edge of mouth bar is easily surpassed beside owing to its poor quality, which can easily gather great amount of remaining oil.

10.6056/dkyqt201905008