Keith A : A sheen of liquid gas (?) is reported on the surrounding sea.

The stuff escaping here is gas condensate or liquid natural gas, which is a low-density mix of hydrocarbon liquids, rather than a gas as such.

Some of it will evaporate and form a true gas. The rest of it will sit on the sea surface in liquid form, and will probably (being very light fractions) also evaporate over a somewhat longer period.