This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Alternative spelling of oil field.

n. a region rich in petroleum deposits (especially one with producing oil wells)

"The fund, which its co-managers say is small because it hasn't gained national attention, has its biggest holdings — besides McDonald's at 3.5% and Chevron at 3.1% — in oilfield-services company Schlumberger Ltd., at 3.3%, Occidental Petroleum Corp., at 3.3%, and Procter & Gamble Co., at 3.2%."

field   

outfield   

tropospheric    army    stations'    transborder    onshore