Loren and Associates, Inc.










Synthetic Seismograms

In the following examples, Red=Sonic Blue=Density Yellow=Impedance

Example Well #1: Indonesia
Synthetic Seismogram from Recorded Data   Synthetic Seismogram from Loren Edited Logs
 
This well had no density log, so one was synthesized during the Log Purification process . The sonic is poor above the calibration break halfway down. No reflectors correlate between the two synthetics except possibly the last one, whose gain is dramatically different.
 
Example Well #2: Philippines
Synthetic Seismogram from Recorded Data   Synthetic Seismogram from Loren Edited Logs
 
This sonic is fairly good, but stops near 7000ft. The density is better than most, but has frequent kicks to the left due to bad hole conditions. The synthetics are very different, though the tie is fairly clear.
 
Example Well #3: GOM Offshore
Synthetic Seismogram from Recorded Data   Synthetic Seismogram from Loren Edited Logs
 
The editing in this well is subtle, but the synthetics are very different. The log character is good, but the background trends are wrong, leading to enough stretch to change the reflection patterns.
 
Example Well #4: Louisiana
Synthetic Seismogram from Recorded Data   Synthetic Seismogram from Loren Edited Logs
 
Two reflection packages dominate the synthetic on the left. The upper is false, caused by major errors in the density log. The lower is false, caused by the beginning of the sonic log. None of the other reflectors correlate unmistakably.
 
Example Well #5: Wyoming
Synthetic Seismogram from Recorded Data   Synthetic Seismogram from Loren Edited Logs
 
The errors in sonic and density logs look acceptable at this scale, but the synthetics are very different.