From the article:
At minus 179 degrees Celsius (minus 290 degrees Fahrenheit), Titan would be an awful place to live. Instead of water, liquid hydrocarbons in the form of methane and ethane are present on the moon's surface, and tholins probably make up its dunes. The term "tholins" was coined by Carl Sagan in 1979 to describe the complex organic molecules at the heart of prebiotic chemistry.
Methane (CH4) and Ethane (C2H6) are only the most basic of hydrocarbons. They are a far cry from what is commonly known as "oil", and are only liquid because of the extreme cold there.
Every oil field on Earth has been traced to an organic source.