The constraint ensured that stretching and squeezing were kept within reasonable bounds, as determined by the interpreter. The method automatically determined the appropriate amount of local stretching and squeezing to produce the highest correlation between the original data and the created synthetic trace. We replaced the last step with a constrained dynamic time-warping technique, to help guide the interpreter. The last step resembles a visual pattern recognition task, which often requires some experience. In the manual procedure, the interpreter first creates a synthetic trace from edited well logs, determines the most appropriate bulk time shift and polarity, and then applies a minimum amount of stretching and squeezing to best match the observed data. We evaluated a semiautomatic method for well-to-seismic tying to improve correlation results and reproducibility of the procedure.
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