A CHEMICAL engineer at Pemex, Mexico’s state-owned oil company, opens a tap atop a maritime platform in this offshore oilfield in the southern part of the Gulf of Mexico. She decants a jar of heavy Mexican crude that comes, hot to the touch, from 3,500 metres below the seabed. It looks like a succulent chocolate sauce, but smells like the back end of a cow. “Taste it,” she laughs.
The crude that she is testing is pumped a short distance across the sea to a vast floating storage tank, known as an FPSO, where it is blended with lighter crude for export. The FPSO stores about 2m barrels—roughly the equivalent of a day’s worth of Mexican oil production. A quarter of that is fed into a supertanker tied alongside, contracted by Chevron, America’s second-largest oil firm. It then sails north across the maritime border to Texas or Louisiana where the crude runs through refineries. The refined petrol or diesel often then returns to…Continue reading