Since there isn’t checkshot logs in the project I’m working, in order to calibrate synthetic seismogram, I have chosen creating a Time-Depth chart by integrating the sonic log carried out in the well. But the dialog box related to this action ask for a value of Two-way Time or Average Velocity to enter to the first sample of the log to be integrated. Depending on this value (or these values), the calculated T-D chart by the program could be reasonable or not, for the products (two way time, interval velocity, average velocity) needed to calibrate the synthetic seismogram.
I’ve known values for SRD and Replacement Velocity. Can I use both of them to calculate the parameters (TWT and Average Velocity) in creating Time-Depth chart?