Iran's move to export Pars crude comes as oil shipments from the Persian Gulf nation are expected to be hit by renewed US sanctions, after Washington withdrew from an international nuclear deal with Tehran, Reuters reported.
Mabrouk was berthed at Ra's Bahregan oil terminal to load Pars crude, Eikon data showed on Tuesday.
Mabrouk was expected to reach Algeciras port in Spain at the end of June or early July, a source familiar with the plans said.
The vessel would load 500,000 barrels of Pars oil from the Ra's Bahregan terminal and a similar quantity of Iran heavy oil from the Kharg port, the source said.
Reuters reported earlier this month that National Iranian Oil Company had awarded the first cargo of Pars oil from the West Karoun fields.
Iran is initially selling the Pars crude on a spot basis as production is not enough for regular export cargoes, the source said.