Where does an Oracle EBS 12.2 appserver save logs from the concurrent worker processes?

Look in the directory $ADOP_LOG_HOME

In here, every session will create its own subfolder. In my case

10  11  2  3  4  5  6  7  8  9

In my case, I had to enter the folder named after session 11.

In here you will find folders named according to exection time, for example

20240916_135516

Inside this folder, you will find folders named according to action, for example "prepare", "cutover", or "apply".

In my case, step inside the "apply" directory and you will find a folder named after your appserver.

Finally, you will find a folder named according to the patch number, for example

36876222_N

with a log directory underneath it.

So the path $ADOP_LOG_HOME/11/20240916_135516/apply/oric-ebsapp01/36876222_N/log is the complete path to your my log directory for the session I am looking for.