The board of directors
Johan Korsmoe
Chairman of the board / Senior Advisor, INPEX Idemitsu Norge
Johan Korsmoe joined INPEX Idemitsu (IIN) in 2003. He has over 30 years’ varied experience in the oil industry.
Prior to joining INPEX Idemitsu, Mr Korsmoe worked 14 years in a number of positions for the Norwegian oil company Saga Petroleum included a year seconded to Statoil. The work included early phase field evaluation, engineering, gas transportation, asset management and strategy.
After joining IIN Mr Korsmoe has been assigned to increasingly senior positions and was appointed Vice President in 2012.
Johan Korsmoe holds a Master of science degree (siv.ing) in mechanical engineering from the University of Trondheim.
Ryota Ando
Managing Director, INPEX Idemitsu Norge
Ryota Ando is the Managing Director of INPEX Idemitsu Norge. He has nearly 30 years of experience in financial reporting, audit, tax, and internal controls, with extensive international experience across the INPEX Group.
After early career roles at IHI Corporation and KPMG Japan, he joined INPEX in 2013 and held senior accounting leadership positions in the INPEX Group before assuming his current role in 2026.
Mr. Ando is a Japanese Certified Public Accountant and holds his CPA qualification since 2007.
Hiroyuki Matsui
Deputy Managing Director, INPEX Idemitsu Norge
Hiroyuki Matsui joined INPEX in 2004 and has over 25 years of international experience in exploration and development, geoscience and project management. He has held senior technical and managerial roles, including leading development optimization for the INPEX-operated Ichthys Project and contributing to CCS site selection in Australia. Prior to his current role, he served as General Manager of Exploration Strategy Unit of INPEX, overseeing the company’s global exploration strategy and portfolio across Australia, Southeast Asia, the Americas, Norway, the Middle East and Japan.
Before joining INPEX, Matsui spent for 5 years with the Japan National Oil Corporation (now JOGMEC) evaluating exploration projects in Australia, Algeria, Indonesia, and Norway. In 2003, he also served as a secondee exploration geologist at Idemitsu Petroleum Norge.
He holds a Master of Science in Geology from the University of Tokyo.
Ayako Nonoue
Advisor, INPEX Idemitsu Norge
Ayako Nonoue joined INPEX in 2007 as a reservoir/production engineer and has accumulated 17 years of experience in the oil and gas industry. Ms. Nonoue has been involved in various projects, with a particular focus on North America. Her work has encompassed engineering studies related to unconventional reservoir development, the assessment of opportunities for new business entries, and providing engineering and operational management support.
During her career, she was involved in a shale gas project in Canada and was seconded to the operating company, Nexen CNOOC Ltd, for 2.5 years.
Ms. Nonoue holds a Master of Engineering degree from Waseda University, Japan.
Risa Kanayama
Chief Legal Counsel, INPEX Corporation
Risa Kanayama is Chief Legal Counsel of INPEX. She joined INPEX in 2018 as Senior Legal Counsel and served as General Counsel of INPEX Idemitsu Norge from 2022 to 2025.
She has nearly 20 years of experience as a lawyer, advising on a wide range of legal matters relating to oil and gas projects and low-carbon solution projects. Prior to joining INPEX, she spent 10 years at a law firm, TMI Associates, where she represented both Japanese and multinational clients in cross-border transactions and disputes.
Ms. Risa Kanayama has a Master of Laws degree from Columbia University and is qualified to practice law in Japan and California.
Øystein Mjøs Blakseth
Principal Development Engineer / Employee Elected, INPEX Idemitsu Norge
Øystein Mjøs Blakseth joined INPEX Idemitsu Norge (IIN) in 2020 and brings more than 20 years of experience from the energy industry. Prior to joining INPEX Idemitsu Norge, Mr. Blakseth held senior engineering and project roles with leading energy and technology companies, including Technip Energies, Wärtsilä and Equinor. He currently works in the Operations Department, supporting our Tampen and Barents Assets.
From 2023 to 2024, Mr. Blakseth was seconded to Equinor, where he worked on the Wisting Reshape Project with a focus on the FPSO and CCS concept.
Mr. Blakseth holds an expanded Bachelor of Science degree in Chemical Engineering, with specialization in Business & Management and Computer Science from the University of South-Eastern Norway (USN).
Marius Flem Lunde
Development Manager / Employee Elected, INPEX Idemitsu Norge
Marius Flem Lunde joined INPEX Idemitsu as a reservoir engineer in 2011 and has 20 years of experience in the Oil and Gas industry. During this period, Mr Lunde also served six years in various positions on the Society of Petroleum Engineers Oslo board. Prior to joining Idemitsu, Mr Lunde worked with optimization software in SPT Group/Schlumberger and as a consultant on CCS in Det Norske Veritas.
Mr Lunde holds an M.Sc. (Siv.ing) degree in Engineering & ICT / Reservoir Engineering from the Norwegian University of Science and Technology, and an Associate Degree in Computer Science from the University of South-Eastern Norway
