For method demonstration, six crude oils from the Danish region of the North were provided by TotalEnergies DK. The crude oils were sourced from the Halfdan, Dan, Kraka, Valdemar, Skjold, and Tyra West fields and sampled at the separator. Oil data and bulk properties, including total acid number (TAN, mg KOH g -1 ), density, and compound class distributions, are described elsewhere.