【摘要】 二氧化碳驱油（CO₂-EOR）技术作为提高采收率和碳封存的重要手段，其动态监测精度直接影响工程效益。常规叠后地震资料丢失了各向异性的原始信息，无法判断主流线方向及注采优势通道。文中以胜利油田G89-1井区滩坝砂油藏为研究对象，利用原始OVT（Offset-Vector Tile）道集的方位信息，提出了基于叠前分方位信息的CO₂监测方法。通过分析方位角与炮检距、覆盖次数之间的关系，生成了适合研究区的分方位角叠加道集；通过注气层顶面振幅一致性处理，获得了CO₂监测的地震各向异性振幅特征。井点分析结果表明，分方位道集振幅的极值与CO₂主流线方向高度吻合，为预测注采优势通道提供了依据。通过对全区地震数据进行振幅一致性处理，提取最大振幅属性，有效预测了CO₂在注气层中的波及范围，评价了剩余油4个有利分布区，指明了下一步勘探开发的优势方向。该研究提出了一种基于OVT方位信息的CO₂地质封存监测方法，为CO₂监测提供了新的技术手段。更多还原

【Abstract】 Carbon dioxide enhanced oil recovery（CO₂-EOR） technology is a crucial means of enhancing oil recovery and storing carbon, and its dynamic monitoring accuracy directly influences project performance. Conventional post-stack seismic data fail to preserve anisotropy information, which makes them unable to determine the main flow direction and dominant injection-production channels. To address this, using the beach-bar sand reservoir in the G89-1 well area of Shengli Oilfield as the research object, this paper proposes a CO₂ monitoring approach based on pre-stack azimuthal information by utilizing the azimuthal data from the original offset-vector tile（OVT） gathers. By analyzing the relationship among azimuthal angles, offsets, and fold numbers, azimuthally stacked gathers suitable for the study area were generated. Meanwhile, by performing amplitude consistency processing on the top of the gas injection layer, the seismic anisotropic amplitude characteristics for CO₂ monitoring are obtained. Well analysis results indicate that the extreme values of amplitudes in the azimuthal gathers are highly consistent with the main flow direction of CO₂, providing a basis for predicting dominant injectionproduction channels. By conducting amplitude consistency processing on the seismic data of the entire area and extracting the maximum amplitude attribute, the sweep range of CO₂ in the gas injection layer was predicted and four favorable distribution zones for remaining oil are evaluated, with the dominant directions for subsequent exploration and development identified. This study proposes a CO₂ monitoring method based on OVT azimuthal information, offering a new technical approach for CO₂ monitoring.更多还原