Preprocessing of the well log

The well log used in this project is from Colombia. A 1000-ft long segment of the sonic log from depths 3600 to 4600 feet was selected for the study. This depth interval corresponds to a predominantly shaly sequence with a marked transition to sandstone at the bottom. Originally the sonic log was sampled at 0.5 feet but I sub-sampled it down to 10 feet intervals using Backus average method (). The sub-sampled log thus contains 99 samples. The left panel of Figure  shows the sub-sampled sonic log as it was used to create the synthetic seismic trace.