Canadian bitumen does not differ substantially from oils such as Venezuelan extra-heavy and Mexican heavy oil in chemical composition, and the real difficulty is moving the extremely viscous bitumen through oil pipelines to the refinery.
kɐnˈeɪdiən bɪtˈuːmɛn dʌznˌɑːt dˈɪfɚ səbstˈænʃəli fɹʌm ˈɔɪlz sˈʌtʃ ɐz vˌɛnɪzwˈeɪlæn ˈɛkstɹəhˈɛvi ænd mˈɛksɪkən hˈɛvi ˈɔɪl ɪn kˈɛmɪkəl kˌɑːmpəzˈɪʃən, ænd ðə ɹˈiːəl dˈɪfɪkˌʌlti ɪz mˈuːvɪŋ ðɪ ɛkstɹˈiːmli vˈɪskəs bɪtˈuːmɛn θɹuː ˈɔɪl pˈaɪplaɪnz tə ðə ɹᵻfˈaɪnɚɹi.