Abstract: The structure interpretation method based on well-seismic integration gradually grew mature and got promotion and application. But some problems are found in the application process: synthetic seismogram calibration, identification of lowlevel small fault, structure illusion under lower walls of large faults, mismatch of well-seismic breakpoint. According to timedepth relationships of the VSP, the acoustic curve is corrected, thus producing accurate synthetic seismograms. The problem of small fault identification is solved by the forward model and with information of tectonic attribute data such as spectral decompositions. By the technique of pre-stack depth migration(PSDM) with acoustic constraints, the accuracy of structural imaging is further improved, and the problem of the false structure and the mismatch of well-seismic breakpoints of seismic profiles in time domain is solved. The application of integrated well-seismic structure interpretation technique effectively guides the spatial positions of the breakpoints, spatial combinations of faults in the typical block of placanticline oilfield, and further improves the accuracy of fault interpretation, thus deepens the understanding of the faulted structure in placanticline oilfield, effectively guides the deployment of new wells and injection-production adjustment near faults, and provides a reliable basis for effective development of placanticline oilfield.

Key words: fault, calibration, illusion, well-seismic integration, Daqing placanticline