Selected wells vs. all wells

Petra can work with any user-selected subset of wells at a time.  Petra modules are independent and can each work with entirely different sets of wells.  It’s possible for the Main Module to select every well in the project, the Map Module to select only wells of a certain depth or greater, and the Cross Section Module to work with only a few wells along a dip line.  

When importing some kinds of data, it’s important to be aware of the wells that are currently selected in the module you’re using.