The Mozambican government said on Monday it had signed oil exploration agreements with US energy firm Exxon Mobil and Russia's Rosneft.
Mozambique's National Petroleum Institute, an energy regulator in the southern African country, said the government was preparing to sign similar agreements with South Africa's Sasol and Italy's Eni.
The agreements could lead to as much as $700-million of investment in Mozambique as the energy firms are expected to drill a minimum of ten wells, eight in deep water and two onshore, the institute added.
The firms earlier won oil tenders as part of Mozambique's fifth licensing round in 2014.
Heavily-indebted Mozambique is hoping its oil and natural gas resources will help it recover from a debt scandal that saw it cut off from multilateral and foreign donors.
More than $30-billion is expected to be invested in Mozambique's gas sector to build capacity to produce 20-million tonnes per year of liquefied natural gas.