Abstract:Prestack depth migration seismic data play an important role in the geologic integrated research with its unique advantage,but depth errors between well logging and seismic data caused by low-frequency migration velocity model limit its wide application in the petroleum exploration and development.The depth correction is the premise and the key in better applications of the data.Although it is impossible to be completely consistent in all aspects due to the different formation mechanism of seismic and well logging data,they should be almost the same in terms of the depth of the formation interface.So in this paper we put forward a well-to-seismic calibration method with high-precision based on dynamic depth warping (DDW) algorithm.First the similarity between observed seismic traces at well locations and synthetic seismogram is analyzed in the depth domain.Then a distance-like quantity between the sampling points is obtained by calculating amplitude,wave number,and time-frequency features based on the forward dynamic programming (DP) algorithm.Finally errors between each seismic layer depth and the true depth can be obtained,and depth calibration can be further performed with the correction value.The proposed method is verified on a theoretical model and real seismic data,and the feasibility and reliability are clearly proved by the results.
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