远源水下扇内部夹层识别与展布规律研究

针对远源水下扇内部储层非均质性严重的问题，综合运用测井物性解释、对子井等方法，对远源水下扇内部夹层进行识别分类，精细刻画夹层的分布特征，系统地分析水下扇内部夹层的展布规律。研究结果表明：歧五断块远源水下扇砂体内部发育泥质夹层与物性夹层；夹层顺物源方向呈“低角度顺流加积式”展布，垂直物源方向呈“U”型或上拱式展布；厚度特征表现为内扇至外扇增加的趋势；分支水道末端与分支水道间夹层发育程度较高，对剩余油的遮挡较好。该研究结果可为油田后期剩余油的分布与预测提供借鉴和指导意义。

Identification and Distribution of Internal Interlayers in Distal Underwater Fan

In view of the strong reservoir heterogeneity within the distal underwater fan,the logging interpretation and paired well were used to identify and classify the internal interlayers in the distal underwater fan.The interlayers were finely characterized to systematically analyze its distribution patterns in the underwater fan.Result shows that there are muddy and tight interlayers in the distal underwater fan sandbodies of Faultblock Qi-5.The interlayers show a“low-angle progressive aggradation”distributionalong the source direction and a“U-pattern”or arcuate distribution.The reservoir thickness increases from the inner fan to the outer fan.The interlayers between the end of branch channel and branch channel show a high development level,which is favorable to shield the remaining oil.This research could provide certain references and guidance for the identification and prediction of remaining oil in the late oilfield development stage.