The meandering channel deposit of the upper member of Neogene Guantao Formation in Shengli Chengdao extra-shallow sea oilfield is characterized by rapid change in sedimentary facies. In addition, affected by surface tides and sea water reverberation, the double sensor seismic data processed by conventional methods has low signal-to-noise ratio and low resolution, and thus cannot meet the needs of seismic description and oil-bearing fluid identification of thin reservoirs less than 10 meters thick in this area. The two-step high resolution frequency bandwidth expanding processing technology was used to improve the signal-to-noise ratio and resolution of the seismic data, as a result, the dominant frequency of the seismic data was enhanced from 30 Hz to 50 Hz, and the sand body thickness resolution was enhanced from 10 m to 6 m. On the basis of fine layer control by seismic data, three types of seismic facies models, floodplain, natural levee and point bar, were defined, and the intelligent horizon-facies controlled recognition technology was worked out, which had a prediction error of reservoir thickness of less than 1.5 m. Clearly, the description accuracy of meandering channel sand bodies has been improved. The probability semi-quantitative oiliness identification method of fluid by prestack multi-parameters has been worked out by integrating Poisson's ratio, fluid factor, product of Lame parameter and density, and other prestack elastic parameters, and the method has a coincidence rate of fluid identification of more than 90%, providing solid technical support for the exploration and development of thin reservoirs in Shengli Chengdao extra-shallow sea oilfield, which is expected to provide reference for the exploration and development of similar oilfields in China.

胜利城岛特浅海油田新近系馆陶组上段曲流河道沉积具有沉积相快速变化的特点。此外，受海面潮汐和海水混响的影响，常规方法处理的双传感器地震数据信噪比低，分辨率低，不能满足薄层地震描述和含油流体识别的需要。该地区的水库厚度不到 10 米。采用两步高分辨率扩频处理技术，提高地震资料的信噪比和分辨率，使地震资料的主频由30Hz提高到50Hz，砂体厚度分辨率从10 m提高到6 m。在地震资料精细层控的基础上，定义了泛滥平原、天然堤和点坝三种地震相模型，并制定了智能层位相控制识别技术，对储层厚度进行了预测小于 1.5 m。显然，曲流河道砂体的描述精度得到了提高。综合泊松比、流体因子、Lame参数与密度的乘积等叠前弹性参数，制定了叠前多参数概率半定量流体识别方法，该方法具有流体识别的符合率90%以上，为胜利城岛特浅海油田薄层油藏勘探开发提供了坚实的技术支撑，