When it comes to navigating the intricacies of the unknown, Tullow Oil is considered an expert, particularly in Africa where it has discovered over 4 billion barrels (Bbbl) of oil during its 30-plus-year history on the continent.
The London-headquartered independent E&P, which is behind the giant Jubilee and Tweneboa-Enyenra-Ntomme oilfield developments offshore Ghana, has reset its exploration portfolio and is ready to test its potential.
During the last few years, the company has exited noncore areas—like many of its peers—and focused on what it describes as high-value assets in Africa and South America. Since August 2013, Tullow’s reshaped portfolio shrank to 10 countries, down from 17, while the number of licenses dropped by two-thirds to 29, company executives said. Acreage fell to about 206,000 sq km (79,537 sq miles) from more than 346,000 (133,591 sq miles).
Tullow’s executives appear excited about the low-cost acreage it has loaded into its portfolio. These include assets offshore Guyana, Suriname, Comoros and Peru among other areas.
“A little goes a long way if you’re smart with where you’re looking,” Ian Cloke, executive vice president of new ventures for Tullow, said recently during company’s 2018 Capital Markets Day.
Tullow hopes its existing portfolio packs transformational potential. The company has a $150 million exploration budget—coupled with experience, discipline, technology and sound execution—to make that happen.
“Put simply we’re trying to do a lot more with less,” Cloke said.
But if the company’s planned three to five wildcat wells lead to discoveries, the prize could be big.
“These licenses have one thing in common: the follow-on potential,” Cloke said. “The major prospects…could be transformational for both Tullow and the host countries. This is a huge prize that we are going after and it’s going to be pretty busy.”
These opportunities include offshore Comoros, an independent state comprised of islands off the southeast coast of Africa. Tullow in late November announced it reached an agreement with Discover Exploration Ltd. to farm into blocks 35, 36 and 37 offshore Comoros in the Indian Ocean. If the deal receives governmental approval, Tullow will have a 35% operated position.
“This is a massive frontier opportunity at all scales—whether it’s the Turbidite systems, whether it’s leads that we’ve got mapped,” Cloke said. “We’ve been evaluating many licenses up and down East Africa. This one passed our selection criteria.”
Chasing giant Turbidite fans shut off the Rovuma Delta, the company is looking for oil in deep water offshore Comoros.
“We believe there’s an oil kitchen out here, outboard of the gas,” he said.
Two partly stacked prospects in Comoros blocks 35, 36 and 37 together contain gross mean unrisked prospective resources of about 7.1 billion barrels of oil, according to an August 2018 Competent Persons Report conducted by ERCE, a U.K.-based independent energy consulting group.
About 17 leads, spanning more than 16,000 sq km (6,178 sq miles), have already been identified.
Discover said in a news release that the Comoros production-sharing contract area is outboard of the about 5,663 Billion cubic meters (200 trillion cubic feet) of gas in place discovered in Rovuma areas 1 and 4 offshore Mozambique. That’s the area where joint venture partners Anadarko Petroleum Corp., China National Offshore Oil Corp., Eni SpA, Exxon Mobil Corp., Mitsui & Co. and PTT Exploration and Production are developing a massive LNG complex.
Currently, Tullow said it has tenders out for seismic work. Plans are to acquire 3-D seismic over the Comoros acreage in 2019.
“We’re positioning ourselves in a future hot spot before it becomes a hot spot just as we did a decade ago in Guyana,” Cloke said.
Offshore Guyana has already proven fruitful for Exxon Mobil, which has made 10 discoveries in the 26,800-sq-km (10,348-sq-mile) Stabroek Block offshore Guyana. The company and its partners—Hess Guyana Exploration Ltd. and CNOOC Nexen Petroleum Guyana Ltd.—put discovered recoverable resource estimates at more than 5 billion barrels of oil equivalent. Discoveries include Liza, Liza Deep, Payara, Snoek, Turbot, Ranger, Pacora, Longtail and Hammerhead.
Tullow Oil, which has 60% operated equity in the Orinduik Block and 37.5% equity in the Kanuku Block, could be next in line to strike oil in waters offshore the small South American country.
“Put simply it has everything going for it. There is oil here,” Cloke said. “It is highly likely that the Hammerhead discovery announced earlier in the year comes into our block.”
Tullow plans to drill two to three wells offshore Guyana in 2019, putting the area at the top of its list of priorities. About 1 Bbbl gross unrisked resources will be tested by the wells. Drilling candidates for 2019 include Amaila, Jethro, Aurituk and Carapa, all Tertiary prospects, plus Kumaka and Carapa, which are Cretaceous prospects.
The company has acquired 3-D seismic across the Kanuku and Orinduik blocks, Cloke said, calling the quality excellent.
“We can use AVO to derisk the Tertiary and prospectivity at the Cretaceous has been seen from the Liza discoveries,” Cloke said.
The Orinduik prospects are in a string of Turbidite channels deposited across a series of terraces, he explained, noting they fill and spill through the Orinduik and Kanuku licenses and out into the Liza licenses.
“The wells will be simple. The water is shallow, and the commercial terms here are excellent. … We will be aiming to commence drilling here in the first half of next year.”
If the company strikes oil, it plans to move from exploration and onto appraisal, development and production to mark first oil within three years.
“If we are successful, they [the prospects] offer exceptional economics,” he added, later noting long lead items have been ordered and rigs identified. “The IRRs here are in mid-$20s, breakeven oil price in the low $30s.”
However, despite the major discoveries made offshore Guyana, Cloke cautioned that “this is still exploration. … Mother Nature can be cruel.”
He recalled a few dry wells in the area. Exxon Mobil’s Sorubim and Skipjack failed to encounter commercial quantities of hydrocarbons.
Still, hopes are high.
“When you look at the potential here, this could be a possible game changer for Tullow,” Cloke said.
In all, Tullow believes the acreage holds about 4 Bbbl of gross mean unrisked resources.
More exploration drilling, appraisal work and seismic acquisition are ahead for the Stabroek Block as the company looks to start activity in Block 59 offshore Suriname.
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