Well-seismic integrated reservoir characterization of Daqing Changyuan oilfield at late high water cut develop -ment stage faces the challenges of small scale of description target ,high requirement for predication accuracy and dense well pattern.Taking Block X56 of Xingshugang oilfield in the Songliao Basin as an example ,we developed a set of tech-nologies consisting of well-seismic integrated structure interpretation ,fault identification and reservoir prediction by utili-zing 3D seismic data and fine geologic study results .The capacity-dimension fractal technology is applied to recognize small faults with throw of about 5 m,solving problems of small faults identification between wells .The plane combination characteristics and extensions of faults are defined and the relationship between low amplitude structure and oil -gas distri-bution is determined by using well-seismic integrated structure interpretation technology .Reservoir sandbody thickness in the 1st member of Putaohua Formation is mapped and the sandbody connectivity between wells is analyzed with the sto -chastic inversion technology .The coincidence rate of prediction of sandbodies with thicknes above 2 meters is more than 75%.On this basis ,sedimentary microfacies map drawn only by borehole data is further revised ,and the planar distribu-tion features of channel sandbody are characterized .The well-seismic integrated 3 D seismic interpretation technology has been applied in several blocks of Changyuan oilfield and the results are satisfactory .% 针对大庆长垣油田高含水后期井－震结合储层描述的目标尺度小、精度要求高、井网密等特点，以松辽盆地杏树岗油田X56区块为研究区，在精细地质研究成果的基础上，充分利用三维地震资料，形成了一套大庆长垣油田井－震结合构造解释、断层识别、储层预测配套技术。通过容量维分形技术，识别了断距5m左右的小断层，解决了井间小断层识别难题；利用井－震结合构造解释成果，搞清了断层的平面组合特征及延伸范围，落实了微幅度构造及其与油气分布关系；采用地震随机反演技术，对葡一组储层砂体厚度进行了平面预测和井间砂体连通性分析，2 m以上砂体预测符合率达到75％以上。在此基础上，进一步修正了仅用井孔资料绘制的沉积微相图，精细刻画了河道砂体的平面展布特征。井－震结合三维地震技术在长垣油田多个区块应用，效果明显。
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