摘要
渤海海域P油田发育河道切叠频繁的辫状河储层,已钻井揭示其储层内夹层发育,导致钻后水淹状态和产能差异较大,夹层精细刻画和精确表征是剩余油挖潜的关键。分析了P油田夹层分布特征及成因,认为夹层分布与构型边界具有较好的相关性,因此提出了基于不连续边界识别的夹层刻画方法。通过两级不连续边界分析识别出边界河道、内部主河道和内部次河道,分别对应复合心滩边界河道充填、单心滩边界河道充填和串沟充填3种夹层类型,建立了各级河道的定量判别标准,确定了夹层厚度中心线;根据研究区300个井组侧钻井资料,分析确定了夹层的平均厚度和翼展宽度;利用分类插值和井点校正得到了夹层厚度分布图。结果表明,P油田馆陶组辫状河储层夹层多以宽翼条带状分布,3种夹层的平均厚度分别为3、2和1m,平均翼展宽度分别为100、50和25m。应用本方法对C10井区L50小层进行了精细研究,夹层刻画结果有效指导了剩余油的挖潜。
Braided river reservoirs with frequent channel cutting and overlapping are developed in P Oilfield in the Bohai Sea,and the development of interlayers in the reservoir has been revealed by drilling,resulting in a large difference in water-flooding state and productivity after drilling.Fine description and accurate characterization of interlayers are the keys to tapping the potential of remaining oil.The characteristics and causes of interlayer distribution in P Oilfield were analyzed,and it was considered that interlayer distribution had a good correlation with configuration boundary,so an interlayer characterization method based on discontinuous boundary identification was proposed.The boundary channel,internal main channel,and internal sub-channel were identified by two-stage discontinuous boundary analysis,corresponding to the three interlayer types of composite core-beach boundary channel filling,single core-beach boundary channel filling,and serial channel filling,respectively.The quantitative discrimination criteria for each level of the channel were established,and the center line of interlayer thickness was determined.According to the side drilling data of 300 well groups in the study area,the average thickness and wingspan width of the interlayer were determined.The distribution map of interlayer thickness was plotted by means of classification interpolation and well point correction.The results show that the interlayers of the braided river reservoir in the Guantao Formation in P Oilfield are mostly distributed in the form of wide wing strips.The average thickness of the three interlayers is 3,2,and 1 m,and the average wingspan width is 100,50,and 25 m,respectively.The method presented in this paper is applied to the L50 Formation in the C10 well area for detailed study,and the results of interlayer description can effectively guide the exploitation of remaining oil potential.
作者
刘建华
侯亚伟
申春生
王鹏飞
高明轩
LIU Jianhua;HOU Yawei;SHEN Chunsheng;WANG Pengfei;GAO Mingxuan(CNOOC China Limited,Tianjin Branch,Tianjin 300459,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2024年第4期143-152,共10页
China Offshore Oil and Gas
基金
“十三五”国家科技重大专项“渤海油田加密调整及提高采收率油藏工程技术示范(编号:2016ZX05058-001)”部分研究成果。
关键词
不连续边界
辫状河储层
夹层厚度中心
翼展宽度
剩余油分布
discontinuous boundary
braided river reservoir
center line of interlayer thickness
wingspan width
remaining oil distribution
