Natural gas contains primarily methane and ethane, with some propane and butane: oil is a mixture of liquid alkanes and other hydrocarbons.
nˈætʃɚɹəl ɡˈæs kəntˈeɪnz pɹaɪmˈɛɹᵻli mˈɛθeɪn ænd ˈɛθeɪn, wɪð sˌʌm pɹˈoʊpeɪn ænd bjˈuːteɪn: ˈɔɪl ɪz ɐ mˈɪkstʃɚɹ ʌv lˈɪkwɪd ˈælkeɪnz ænd ˈʌðɚ hˈaɪdɹəkˌɑːɹbənz.