.... This factory was shutdown due to the consequence of imported natural gas in 1950s. crude oil --> 原油 coil mine --> 煤礦 oil gas --> 油氣 natural...
液態天然氣 liquefied natural gas, 縮寫為 LNG 天然氣 natural gas 液化石油氣 liquefied petroleum gas...
... is found "介係詞應為in而非into" both oil and natural gas.