WordNet
petroleum geology
n. the branch of economic geology that deals with the occurrence and exploitation of oil and gas fields
Wikipedia
Petroleum geology
Petroleum geology is the study of origin, occurrence, movement, accumulation, and exploration of hydrocarbon fuels. It refers to the specific set of geological disciplines that are applied to the search for hydrocarbons ( oil exploration).
Usage examples of "petroleum geology".
Naturally we've developed some side lines since we've been aloft, but they're mostly natural outgrowths of petroleum geology-on which subject we happen to be experts.