Influence of reservoir interbed in Triassic lower oil group on residual oil distribution,Tahe Oil Field
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摘要: 夹层是表征储层非均质性主要参数之一,也是影响剩余油分布的主要因素。综合岩心、电性及相关地质统计学分析资料,对塔河油田三叠系下油组辫状河三角洲辫状河道砂坝中夹层的成因类型、分布特征及夹层对剩余油的影响进行了研究,划分识别了泥质、钙质和物性夹层;夹层分布特征主要呈连片分布、单井控制孤立透镜状分布及不规则冲刷充填沉积;认为储层上部夹层对剩余油的控制作用最强,其次为底部油水界面附近泥质充填沉积夹层,中部夹层控制剩余油作用最弱。Abstract: Interbed is an important parameter to characterize reservoir heterogeneity.It is also the keyfactor influencing residual oil distribution.Based on core,logging and geological statistic data,the ori-gin,distribution and influence on residual oil of interbed in braided channel sand bar of braided channeldelta of the Triassic lower oil group in the Tahe Oil Field were studied.The interbeds were divided intomuddy,calcareous and petrophysical ones.They might distribute contiguously,or in lens shape con-trolled by single well,or sometimes deposit due to irregular erosion and filling.The upper interbeds inreservoir have the strongest control on residual oil.The muddy interbeds near to oil-water interface atthe bottom have less control on residual oil.The middle ones have the least control.
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Key words:
- residual oil /
- distribution characteristics /
- interbed /
- lower oil group /
- Triassic /
- Tahe Oil Field
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