Oil Field
noun
An oil rice paddy is really more like an oil field.
ゆでん
This is a jukugo word, which usually means on'yomi readings from the kanji. You haven't learned this reading for 田 yet. Just think about how you walk into the oil field and you see a bear den (でん), filled with oil.
残念ですが、どの油田も私のものではありません。
Unfortunately, none of those oil fields are mine.