利用叠前方位信息进行二氧化碳驱油监测

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中图分类号：P631 文献标识码：A DOI：10.13810/j.cnki.issn.1000-7210.20250150

Abstract：Carbon dioxide enhanced oil recovery （ CO2 -EOR）technologyis 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 addressthis，using thebeach-bar sand reservoir in the G89-1 wellarea of Shengli Oilfield as the research object， this paper proposes a CO2 monitoring approach based on pre-stack azimuthal information by utilizing the azimuthaldata 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. Wellanalysis results indicate that the extreme values ofamplitudes 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 forremaining 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.

Keywords： OVTgather，pre-stack azimuthal information， CO2 -EOR，amplitude analysis，dynamic monitoring

曲志鹏，陈永芮，邹春丽，等。（剩余12068字）