东营凹陷永安镇油田沙二段三角洲相储层构型及剩余油分布

针对油田三角洲储层精细表征及剩余油挖潜,以东营凹陷永安镇油田沙二段三角洲储层为例,利用地震、测井、地质等资料,研究三角洲储层沉积旋回、层次界面等不同层次构型要素,界定和划分构型单元,建立三角洲储层构型模式,分析构型单元对剩余油分布的控制作用.结果表明:三角洲前缘水下分流河道发育是单一河口坝边界识别的重要标志;构型单元韵律变化是造成剩余油局部富集的重要因素,正韵律水下分流河道砂体中上部剩余油相对集中,反韵律河口坝砂体下部剩余油富集.该研究可以为老油田剩余油挖潜、提高油气采收率提供指导.

Deltaic reservoir architecture and remaining oil distribution study of Es_2 member in Yonganzhen oilfield,Dongying sag

Reservoir architecture study is the need of fine reservoir characterization and remaining oil development in recent stage while there are few reservoir architecture studies on deltaic reservoirs.This study takes deltaic reservoir of Es2 Member in Yonganzhen Oilfield,Dongying Sag as an example to make deltaic reservoir architecture study.In this study,multi-scale data,such as seismic data,well logs and geologic data,are integrated to study on the sedimentary cycles,architecture surfaces and reservoir architecture elements on different scales.Reservoir architecture units are defined and classified.It is concluded that underwater distributary channel of delta front is an important mark for single bar boundary recognition.Deltaic reservoir architecture model is built in this study.The influence of reservoir architecture on the distribution of remaining oil is analyzed and it is pointed out that rhyme change inside reservoir architecture unit is an important influence factor on distribution of remaining oil.Remaining oil enriches relatively in the upper part of underwater distributary channel sand,which has a positive rhythm,and the lower part of river mouth bar,which has a inverted rhythm.