Abstract: The seismic data quality in complex deposit zone is generally poor.The prestack depth migration imaging can not only improve the imaging quality in complex depositional area,but also can improve the signal-to-noise ratio and resolution so as to suppress multiple waves and highlight the deep reflection.By taking a deepwater oilfield in South America as an example,with the use of the pre-stack depth migration seismic data,the seismic attributes of sedimentarycharacteristics can be extracted. Meantime,with several other seismic attributes and San yuan chromatographic toning technology,the deepwater turbidite deposition geometric features can be clearly depicted.On the basis of the appraisal well drilling,the distribution characteristics and the vertical reservoir thickness of deepwater turbidite have been basically made clear,which can provide technical support for optimizing the well location.