answers.input_text: short
answers.span_text: Nigeria
questions: in which regions are most of africa petroleum and natural gas found
name: Petroleum industry in Nigeria
contexts: Nigeria is the largest oil and gas producer in Africa . Crude oil from the delta basin comes in two types : light , and comparatively heavy -- the lighter around 36 gravity and the heavier , 20 -- 25 gravity . Both types are paraffinic and low in sulfur .