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克拉玛依油田经过半个世纪注水开发,已进入开发后期,提高采收率的关键是明确剩余油的分布规律。在对研究区克拉玛依组沉积相研究的基础上,分析了不同类型剖面结构代表的基准面变化规律,将该组的短期基准面旋回划分为2大类12个小类。短期基准面旋回的规律性变化是受中期基准面变化控制的,克拉玛依组可划分为3个中期基准面旋回和14个短期基准面旋回,在此基础上建立了研究区的等时地层格架。在等时地层格架内,短期基准面旋回内剩余油分布规律不同;高可容纳空间的储层,等时性较强,层内非均质性弱,剩余油主要分布在储层厚度薄、面积小、未动用或水洗程度差的区域;低可容纳空间的储层,等时性较差,往往是不同期储层的叠置,层内非均质性强,剩余油呈透镜状分布,且主要分布在渗透性相对较差的区域。
After half a century of waterflooding development in Karamay Oilfield, it has entered the late stage of development. The key to enhance oil recovery is to clarify the distribution of remaining oil. Based on the study of the sedimentary facies of the Karamay Formation in the study area, the variation law of the datum surface represented by the different types of profile structures is analyzed. The short-term base-level cycles of the group are divided into 12 sub-categories of 2 major categories. The regular change of short-term base-level cycles is controlled by mid-level base level changes. The Karamay Formation can be divided into three medium-term base-level cycles and 14 short-term base-level cycles. Based on this, an isochronal stratigraphic framework . In the isochronal stratigraphic framework, the distribution pattern of residual oil in short-term base-level cycles is different. Reservoirs with high accommodation space are more isochronous with weak intra-layer heterogeneity, and the remaining oil is mainly distributed in the thin , Small area, unused or poorly washed areas; reservoirs with low containment space are less isochronous and tend to be superimposed by reservoirs of different ages with strong intra-layer heterogeneity and leftover oil lenticular Distributed, and mainly distributed in the area of relatively poor permeability.