Drift time estimation by dynamic time warping
Tianci Cui, Gary F. Margravé · 2015
Summary The drift time is the traveltime difference at the seismic frequency and the sonic logging frequency in anelastic media. In this abstract, we use dynamic time warping to estimate the drift time. Stationary and nonstationary seismograms are constructed based on well log data and the constant-Q theory. We first use a standard constraint to estimate the drift time and examine the necessity of drift time correction in seismic-to-well ties. Then we use a positive constraint and a smoothing procedure to improve the estimation. We also calculate average Q values from the estimated drift time, compare dynamic time warping with time-variant crosscorrelation and finally analyze the influence of internal multiples on drift time estimation.