By Isqil Najim
In 1985, Oluseyi Afolabi stepped onto the oil patches of Port-Harcourt as a fresh NYSC Chemical Engineering graduate; forty years on, she has presided over a billion-barrel oil field discovery, managed a $20 billion global portfolio across four continents, shaped national energy legislation, and become the first General Manager with power of attorney for ExxonMobil’s upstream companies in Nigeria.
On June 4, 2026, the Nigerian Society of Engineers conferred her with the Fellowship of the Nigerian Society of Engineers, FNSE. She also holds the Fellowship of the Nigerian Society of Chemical Engineers, FNSChE, and an honorary doctorate. This is the story of how that career was built.
The foundation was laid in 1984, when Afolabi graduated from the University of Lagos, Akoka, with a Bachelor of Science in Chemical Engineering. In 1985, she completed her National Youth Service Corps with Ashland Oil Company in Port-Harcourt and converted that posting directly into her first professional appointment as a Production Engineer with the same company.
After four years as a Production and Reservoir Engineer, she made the move that would define everything ahead, she joined Mobil Producing Nigeria as a Reservoir Engineer III.
At Mobil Producing Nigeria, Afolabi rose to Senior Reservoir Engineer, taking charge of major fields including Edop and Etim. What she did with that responsibility changed the commercial history of both.
For Edop, she worked alongside senior research engineers at Mobil Exploration & Production Technology Company in Dallas, Texas, making the case which was unpopular at the time, that the field’s solution gas drive reservoirs required gas injection to sustain producibility. The $300 million gas injection project was approved by the Board of Mobil Oil Corporation. Gas injection commenced in the Edop field in 1992. Production peaked at 250,000 barrels per day and held above 200,000 barrels per day for years. Edop became, and remained, Mobil Producing Nigeria’s flagship field for a generation.
The field had been producing since 1973. The industry had settled on an estimated Original Oil Initially In Place of approximately 200 million barrels and had no reason to question it. Afolabi had a reason.
Using classical material balance evaluation methodology, she recalculated the Etim field’s OOIP and found it was at least three times the booked volumes. With the Geoscience Manager’s approval, new seismic acquisition was conducted, the field was remapped on fresh drilling results, and the OOIP was confirmed at close to one billion barrels. Production leapt from 19,000 to 65,000 barrels per day.
She recalculated the Original Oil Initially In Place and proved that the Etim reservoir held close to 1 billion barrels instead of the previously documented 200 million and production surged from 19,000 to 65,000 barrels per day.
In 1998, she was transferred to MEPTEC the Mobil Exploration and Production Technology Center in Dallas, Texas to deepen her expertise in Reservoir Management and Simulation.
Following the merger of Exxon and Mobil, Afolabi moved to the ExxonMobil Central Technology Office in Houston, Texas, conducting Asasa Field simulation studies from 2000 to 2001. She returned to Nigeria as Reservoir Engineering Supervisor for the East Area and the Oso field. Every field under her supervision, it is documented, increased in both production and reserves during her tenure.
In 2003, she was promoted as General Manager, Plans, Programs and New Business Development for the ExxonMobil companies in Nigeria, becoming the first General Manager with power of attorney to act on behalf of both upstream companies.
In 2005, she became General Manager, Commercial and Nigeria Content Development and began work that would outlast her corporate career by decades. Working directly with the National Assembly, NNPC, the Nigeria Content group, the DPR, and industry counterparts, she contributed significantly to the enactment of the Nigerian Oil and Gas Industry Content Development Act the NOGIC Act 2010.
Her advocacy ensured that major installations Erha, Erha North, Erha North Phase 2, and Satellite Fields Phase 1 had their full engineering, procurement, construction, installation, and commissioning executed entirely by Nigerian companies. That domestic capacity still thrives today.
In 2007, she was promoted to General Manager, Projects Development. In 2009, she moved to ExxonMobil Development Company as Project Management Advisor and later Construction Support Manager, overseeing a portfolio valued at more than $20 billion across Asia/Pacific, the Caspian, the Gulf of Mexico, and Nigeria.
In 2012, she returned home as General Manager, Project Support, and was simultaneously appointed to the Board of Directors of Mobil Producing Nigeria Unlimited, becoming the only woman on an eight-man board. By 2015, she held directorships across all three ExxonMobil upstream entities in Nigeria simultaneously, leading all commercial negotiations as General Manager, Commercial and New Business Development.
On March 31, 2017, Afolabi retired from ExxonMobil after 28 years of service. She took a deliberate year away, then in September 2018 founded Reservoir and Facilities Solutions Limited (RFS), an Engineering and Geoscience integrated service company backed by over 41 years of experience in the full value chain of the oil and gas industry.
RFS was built on three pillars: providing reservoir management support to Nigerian independent producers; strengthening the industry’s contribution to the national economy; and preparing engineering graduates for long-term sector careers.
Afolabi has a firm conviction that What Nigerian engineers need most is not rescue, but belief, mentorship, and opportunity. And on this, she has been walking her talk. Her company sponsored of the SHEnovation Grand Finale organised by APWEN Lagos Chapter.
A lifelong advocate for women in engineering, she was the first female Chairman and Section Director of SPE Lagos Section 061, and currently serves as Chairman of the Board of Trustees of the SPE Nigeria Council (2025 2027). She sits on the University of Lagos Faculty of Engineering Alumni Association Board of Trustees, is a member of the Nigerian American Multicultural Council in Houston, and serves as Chairman of WID Data Analytics Company.
She is also the founder of Smile, Chuckle and Laugh Children’s Edutainment Center in Lekki, a purpose-built after-school facility for school-age children, commencing operations in the third quarter of 2026. She is married to Chief (Dr.) Tunde Afolabi and they have children.
The FNSE is a recognition long due. What she builds next is the more interesting question.