Japanese gas giant, Inpex has signed a $24 million deal to set up a fund for Darwin's Larrakia people almost a decade after it was first promised.

The fund will exist for the projected 40-year lifespan of the Gas pipeline project at Bladin Point near Darwin.

At a ceremony in Darwin, the Inpex chief executive said his company wanted to recognise the Larrakian people as traditional owners of the region's land and waters.