As per #Geology mainly deals with Earth #processes [leading to stratigraphy & structure] (~Geophysics), Earth #materials [potential] (~Geochemistry), and Earth #history [geohistory] (~Geobiology); my developed #WAHHAB_Petroleum_Workflow for petroleum investigations strictly follows the #Geology three main themes, as #Reservoir_Geology, Reservoir_Geophysics, and #Petroleum_System_Analaysis.