Figure 1.2 of 'the practice of reservoir engineering' demonstrates how significantly the role of the reservoir engineer has changed since the books publication in 1994. In it Laurie Dake depicts the reservoir engineer at the 'center of the universe'. The 'universe' comprises:
Geology/Geophysics/Economics/Petrophysics/Production, Process and Project engineering
A contemporary illustration might show 'Asset management' at the center of the reservoir engineers universe and include Drilling and Completion engineering within it.