Answer:
Metaphor.
Step-by-step explanation:
A metaphor is a literary device that helps make a comparison, explain an idea or draw an analogy between two things. The excerpt is from Bart Edelman's "The Shot Wok Kim" that illustrates the murder of a Korean immigrant during the night shift at his work at a gas station. The poem is inspired by a real-life incident. The poet uses the phrase "petroleum morgue" as a metaphor to compare and exemplify an image of darkened, dim and gloomy morgue like petroleum. The poet did not employ words like 'as' or 'like' that symbolize simile. Thus, the phrase exemplifies the metaphor.