Ghana's next oil frontier? Petrobas opens talks for four Keta Basin Block

Brazilian energy giant Petrobras has entered negotiations for four offshore exploration blocks in Ghana’s Keta Basin, opening a potentially important new chapter in the country’s search for its next major oil and gas frontier.

Ghana could be about to attract one of the world’s most experienced offshore oil explorers to a part of its coastline that remains largely untested.

Brazil’s state-owned energy giant Petrobras confirmed on August 21 that it has begun negotiations for exploration contracts covering four offshore blocks in Ghana’s Keta Basin, after submitting an expression of interest to the government.

Ghana’s Ministry of Energy and Green Transition has approved the company’s application to proceed to direct negotiations over the terms of the exploration contracts.

It is an early step.

Petrobras has not announced an oil discovery in Ghana, nor has it yet been awarded producing assets. The talks concern the right to explore acreage that could eventually be subjected to seismic studies, drilling and further geological evaluation.

But the identity of the company looking at Keta — and the reason it is interested — makes the development significant.

Why Petrobras is looking at Ghana

Petrobras is one of the most experienced deepwater oil companies in the world, with decades of expertise developing complex offshore resources off Brazil.

The company says its interest in Ghana forms part of a broader strategy to replace its oil and gas reserves by entering new exploration frontiers both at home and internationally.

Africa is increasingly central to that strategy.

Petrobras is expanding its exploration footprint across the continent, with interests extending to countries including São Tomé and Príncipe, Namibia, Côte d’Ivoire and South Africa.

But Ghana offers Petrobras something particularly interesting: geology that the company already knows.

Petrobras exploration and production chief Sylvia Anjos told Reuters that the geology of Ghana’s Keta Basin shows similarities with Brazil’s Equatorial Margin, another major frontier where the company is searching for new petroleum reserves.

That connection between the two sides of the Atlantic is not accidental.

Africa and South America were once joined before the opening of the Atlantic Ocean. Petroleum systems along sections of their opposing coastlines can therefore share geological characteristics.

For an explorer such as Petrobras, knowledge developed on one side of the Atlantic can help inform where to search on the other.

The Keta Basin: Ghana’s eastern frontier

Ghana’s modern oil industry has largely been built in the west.

The 2007 discovery of the Jubilee Field in the Tano-Cape Three Points Basin transformed the country into a significant oil producer, with commercial production beginning in 2010.

Subsequent developments including TEN and the Sankofa-Gye Nyame fields reinforced the Western Basin as the centre of Ghana’s offshore petroleum industry.

Keta represents a different proposition.

The Accra-Keta Basin, also referred to as Ghana’s Eastern Basin, covers approximately 33,900 square kilometres, including about 1,900 square kilometres onshore.

It stretches eastwards as part of the wider Dahomey Basin through Togo and Benin towards western Nigeria.

Ghana’s Petroleum Commission says geological studies indicate the existence of a working Cretaceous petroleum system in the basin, including mature source rocks, potential reservoirs and several possible structural and stratigraphic traps capable of holding hydrocarbons.

The basin is therefore not unexplored because nobody believes oil could exist there.

The question is whether commercially viable accumulations can be found.

Exploration of the area also has a long history. Ghana’s Petroleum Commission records that Soviet and Romanian geoscientists carried out petroleum exploration in the Accra-Keta area during the 1960s, with a Romanian team drilling a stratigraphic well near Atiavi in the Keta Basin in 1966.

More than half a century later, Petrobras is preparing to take another look.

Why this matters for Ghana

For Ghana, attracting a company of Petrobras’ scale would matter beyond the four blocks themselves.

The country needs new exploration if it is to identify another generation of producing fields.

Oil fields are finite assets. Production eventually declines unless new reserves are discovered, existing resources are developed or new technologies extend field life.

That makes exploration the first step in sustaining an upstream petroleum industry over the long term.

A successful Keta campaign could also begin to shift Ghana’s petroleum geography.

Since commercial production began, the country’s offshore oil economy has been overwhelmingly associated with the Western Region.

A significant discovery in the east could eventually create an entirely new centre of offshore petroleum activity — with implications for infrastructure, logistics, services, local suppliers and investment.

But those possibilities remain some distance away.

Four blocks do not mean four oilfields

The distinction matters.

Petrobras is currently negotiating exploration contracts.

Those negotiations will determine whether the company ultimately secures the acreage and under what conditions.

If agreements are completed, exploration could then involve further geological interpretation, seismic acquisition and eventually the drilling of exploration wells.

Only drilling can establish whether identified prospects actually contain hydrocarbons.

And even discovering oil or gas does not automatically create a commercial field.

A discovery must be sufficiently large, technically recoverable and economically viable before billions of dollars can be committed to development.

Offshore frontier exploration is therefore a high-risk business.

Companies can spend large sums searching and still find nothing commercially recoverable.

Still, Petrobras changes the conversation

That uncertainty is precisely why the arrival of Petrobras matters.

Major international oil companies allocate exploration capital selectively. Frontier drilling is expensive, and companies increasingly compete globally for acreage that offers the right combination of geology, fiscal terms, political stability and commercial potential.

Petrobras' willingness to begin negotiations suggests that Ghana’s eastern offshore acreage has passed at least an initial strategic and geological test within one of the world’s largest petroleum companies.

For Ghana, that is an opportunity.

But the more important test comes next.

The country will need to negotiate terms that are attractive enough to bring serious exploration capital into the basin while ensuring that Ghana captures sufficient value if discoveries are eventually made.

And Petrobras will still have to prove that the geological similarities it sees beneath Ghanaian waters translate into actual barrels of oil or gas.

Almost two decades after Jubilee transformed Ghana’s petroleum industry, the search for what comes next is becoming more urgent.

This time, attention is turning east.

And beneath the waters of the Keta Basin, Petrobras believes there may be something worth looking for.