INPEX
Japan's largest oil and gas exploration and production company, with upstream and energy-infrastructure projects across multiple countries.
Last updated November 4, 2026
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Overview
INPEX Corporation is a Japanese energy company focused primarily on the exploration, development and production of oil and natural gas. It was established in February 1966 as North Sumatra Offshore Petroleum Exploration Co., Ltd., reflecting the importance of overseas resource development to Japan's energy strategy. The company later adopted the INPEX identity and expanded from a Japan-linked exploration venture into an international upstream operator. INPEX's activities combine exploration, field development, production, gas processing, liquefied natural gas infrastructure and domestic energy transportation. In Japan, its principal operational base has included the Minami-Nagaoka Gas Field in Niigata Prefecture. The company also operates the Naoetsu LNG receiving terminal and a domestic natural-gas pipeline network of approximately 1,500 kilometres, connecting gas supply with customers in Japan. These domestic assets complement its overseas oil and gas portfolio and give the company a role in both resource production and energy delivery. A major turning point came in 2006, when INPEX Corporation and Teikoku Oil agreed to create INPEX Holdings through a government-orchestrated consolidation. The integration was completed in October 2008, resulting in the modern INPEX Corporation and a headquarters move to Akasaka, Tokyo. Teikoku Oil contributed a long history of Japanese oil and gas operations dating from its establishment as a semi-governmental company in 1941. Its legacy included development and production at fields such as Yabase, Kubiki, Minami-Aga and Higashi-Kashiwazaki, as well as overseas projects in Africa and Egypt. INPEX became a publicly traded company on the first section of the Tokyo Stock Exchange on November 17, 2004. The offering involved the sale of shares previously held by Japan National Oil Corporation, a government-linked organization that at the time owned a majority stake. The listing marked a further transition from a state-associated resource enterprise toward a publicly accountable international company. The Ichthys project in northern Australia became INPEX's most prominent international development. The company established INPEX Browse in 1998 to pursue the offshore gas opportunity. After a change in project concept and the involvement of Total, the planned processing location moved from the Western Australian offshore concept to the Bladin Point industrial area near Darwin in Australia's Northern Territory. The project included offshore production facilities, a long subsea pipeline, an onshore LNG plant and condensate and liquefied petroleum gas facilities. INPEX announced the final investment decision in January 2012, and the first LNG cargo was shipped in October 2018. Ichthys materially increased the company's LNG production capability and international profile. Another important project is the Abadi gas field in Indonesia's Masela Block. INPEX discovered the field in 2000 and acquired a 100 percent participating interest in the block in 2008. Abadi was notable as the first discovery of crude oil and natural gas in the Arafura Sea. The company pursued development planning and front-end engineering work, although the project timeline and development arrangements evolved over time. INPEX also holds interests in major Caspian-region projects, including the Kashagan field in Kazakhstan and the Azeri-Chirag-Gunashli project offshore Azerbaijan. Its earlier international portfolio included operations in Egypt and the Democratic Republic of the Congo. The company's original Mahakam Block position in Indonesia was ultimately affected by the Indonesian government's decision to nationalize the block in 2018; the asset is now operated by Pertamina. INPEX is therefore positioned as a Japan-based, globally active upstream energy company rather than a consumer-facing fuel or petrochemical brand. Its business remains centered on large-scale oil and gas projects, particularly natural gas and LNG, while its Japanese infrastructure supports domestic supply. The company has also described its broader role in terms of responding to energy-security needs and participating in the transition toward lower-carbon energy, although the reference material supplied here does not provide enough detail to document specific renewable businesses, emissions targets or current strategic programs.
History
INPEX originated in Japan's postwar effort to secure overseas petroleum resources. It was established in February 1966 as North Sumatra Offshore Petroleum Exploration Co., Ltd. The company's first operating base was the Mahakam Block in Indonesia, and its early identity was closely associated with international exploration undertaken with Japanese institutional and governmental support. The company's later development was strengthened by the incorporation of assets and experience from Teikoku Oil. Teikoku Oil had been founded in 1941 as a semi-governmental company intended to consolidate Japan's oil exploration businesses. Its domestic history included the start of development at the Yabase oil field in Akita in 1950, production from the Kubiki oil and gas field in 1959, completion in 1962 of Japan's first long-distance natural-gas pipeline between Tokyo and Niigata Prefecture, development of the Minami-Aga oil field in 1965 and production from the Higashi-Kashiwazaki gas field in 1970. Teikoku Oil also pursued overseas projects, including work in the Democratic Republic of the Congo and production at Egypt's West Bakr block beginning in 1980. INPEX's transition toward a public-company structure took place in the early 2000s. On November 17, 2004, it was listed on the first section of the Tokyo Stock Exchange. Japan National Oil Corporation, which then held a 53.96 percent interest, sold 343,725 shares, equivalent to 17.9 percent of INPEX's 1.92 million outstanding shares. The Ministry of Economy, Trade and Industry also held a significant interest at the time. The transaction made INPEX the second JNOC subsidiary to be taken public, following Japan Petroleum Exploration Company. In April 2006, INPEX Corporation and Teikoku Oil agreed to create INPEX Holdings in a government-orchestrated merger. The consolidation was completed on October 1, 2008, creating the present INPEX Corporation and relocating its headquarters to Akasaka in Tokyo. This combination gave the group a broader domestic operating base and the ability to pursue larger international projects. A central chapter in the post-merger history was the Ichthys gas development offshore northwestern Australia. INPEX created INPEX Browse in 1998 for the project, following the discovery of gas in the WA-285-P permit area. The initial concept contemplated offshore processing and an LNG plant on the Maret Islands. After Total entered the project and regulatory and development considerations changed, the onshore LNG facilities were moved to Bladin Point on the Middle Arm Peninsula near Darwin, with a long pipeline linking the plant to the offshore field. Front-end engineering design was completed in April 2011, and the final investment decision was announced on January 13, 2012. Construction-related early works began in 2012, while the first LNG cargo was ultimately shipped in October 2018. INPEX also developed the Abadi gas field in Indonesia's Masela Block. The field was discovered in 2000 through the Abadi-1 exploration well, and INPEX acquired a 100 percent participating interest in the block in November 2008. Abadi was described as the first crude-oil and natural-gas discovery in the Arafura Sea. The company submitted a development plan, obtained approval and prepared for front-end engineering activities, although the projected production schedule in earlier planning did not represent the eventual operating timetable. The company's international portfolio has included minority interests in Kazakhstan's Kashagan field and Azerbaijan's offshore Azeri-Chirag-Guneshli project. Its portfolio has also included Egypt and the Democratic Republic of the Congo. In Japan, the Minami-Nagaoka Gas Field remains a central production asset, supported by the Naoetsu LNG receiving terminal and approximately 1,500 kilometres of gas pipelines. The Mahakam Block, meanwhile, was nationalized by Indonesia in 2018 and is now operated by Pertamina. By the end of 2019, INPEX reported 3,117 consolidated employees in the reference material. The company's historical expansion shows a progression from a government-linked overseas exploration vehicle to a listed, multinational oil and gas producer with major LNG capabilities and a continuing role in Japan's domestic energy system.
- 2018
Ichthys LNG makes its first shipment
[1]The first cargo from the Ichthys LNG plant was shipped in October.
- 2018
Mahakam Block is nationalized
[1]Indonesia took control of the Mahakam Block, which is now operated by Pertamina.
- 2012
Ichthys final investment decision is announced
[1]INPEX and its partners approved the Ichthys LNG development after completing front-end engineering design and revising the project concept.
- 2008
Modern INPEX Corporation is formed
[1]The merger of INPEX, INPEX Holdings and Teikoku Oil was completed on October 1, and the headquarters moved to Akasaka, Tokyo.
- 2006
INPEX and Teikoku Oil agree to combine
[1]The companies agreed to form INPEX Holdings through a government-supported merger.
- 2004
INPEX becomes publicly listed
[1]INPEX was listed on the first section of the Tokyo Stock Exchange on November 17.
- 2000
Abadi gas field is discovered
[1]INPEX discovered the Abadi field in Indonesia's Masela Block through the Abadi-1 exploration well.
- 1998
INPEX Browse is created
[1]INPEX established INPEX Browse to pursue the offshore Australian gas opportunity that became the Ichthys project.
- 1966
INPEX is founded
[1]INPEX was established as North Sumatra Offshore Petroleum Exploration Co., Ltd.
- 1962
Japan's first long-distance natural-gas pipeline is completed
[1]Teikoku Oil completed a pipeline linking Tokyo and Niigata Prefecture.
Products and positioning
A Japanese international upstream energy company focused on oil and natural gas exploration, development and production, with particular strength in large-scale natural-gas and LNG projects and supporting domestic Japanese infrastructure.
Upstream petroleum
Crude oil
Crude oil is one of INPEX's principal upstream outputs. The company has developed and participated in oil-bearing assets in Japan and overseas, including historical operations in Egypt and projects in other international regions. INPEX's role is generally the exploration, appraisal, development and production of petroleum resources rather than the sale of branded retail fuel.
Upstream gas
Natural gas
Natural gas is a core focus of INPEX's portfolio. Japanese production has included the Minami-Nagaoka Gas Field, while overseas gas developments include Ichthys in Australia and Abadi in Indonesia. Gas is produced through field-development projects and supplied either into domestic infrastructure or to processing facilities for international markets.
LNG · 2018
Liquefied natural gas
INPEX participates in LNG value chains by developing gas resources and processing them for export. The Ichthys LNG Project near Darwin is the company's best-known LNG development in the supplied material. It combines offshore production, a long gas pipeline and onshore liquefaction and export facilities.
Natural-gas liquids
Condensate
Condensate is produced alongside gas in certain INPEX developments and forms part of the hydrocarbon output associated with projects such as Ichthys. It is a liquid hydrocarbon recovered during natural-gas production and processing rather than a consumer-facing branded product.
Energy infrastructure
Domestic gas transportation and receiving infrastructure
In Japan, INPEX operates the Naoetsu LNG receiving terminal and a natural-gas pipeline network of approximately 1,500 kilometres. These assets receive, transport and connect gas supplies with Japanese customers, extending the company's role beyond field production into energy infrastructure.
Brand decisions
2018
Ichthys LNG production beginsProduct launchBackground
The Ichthys development progressed from construction into operations after the offshore field, pipeline and Darwin processing facilities were completed.
Action taken
The project delivered its first LNG shipment in October 2018.
Aftermath
Ichthys became a major operating asset and expanded INPEX's position in international LNG production.
2012
Final investment decision for Ichthys LNGStrategyBackground
The Ichthys project had moved from an earlier Maret Islands concept to an onshore LNG development at Bladin Point near Darwin, following regulatory and project-design changes.
Action taken
INPEX and its project partners approved development of the offshore gas field, pipeline and Darwin LNG facilities. The project was designed for approximately 8.4 million tonnes per year of LNG capacity.
Aftermath
Early construction works began in 2012, and the first LNG shipment was made in October 2018. Contemporary estimates placed project cost at approximately US$34 billion, compared with an earlier estimate of US$20 billion.
Estimated project cost. US$20 billion → Approximately US$34 billion (At the January 2012 final investment decision; comparison with earlier estimate)
2006
Creation of INPEX HoldingsM&ABackground
INPEX Corporation and Teikoku Oil were selected for a government-orchestrated consolidation intended to combine their Japanese and international oil and gas capabilities.
Action taken
The companies agreed to form INPEX Holdings, with the transaction later leading to the creation of the modern INPEX Corporation.
Aftermath
The merger was completed in October 2008 and the headquarters moved to Akasaka, Tokyo.
Recent events
INPEX announces agreement to acquire Woodside’s Bonaparte CCS interest[3]
Reported:
INPEX announced an agreement to acquire Woodside Energy’s 21% participating interest in the Bonaparte CCS Project, which would increase INPEX’s interest to 74%. Completion is subject to conditions, including Australian government regulatory approvals.
- Unconfirmed
Inpex sells Venezuelan gas and oil assets to Sucre Energy Group[4]
Reported:
Inpex sold Venezuelan gas and oil assets to Sucre Energy Group. Sources cited in the article said Sucre purchased up to 70% of Inpex’s stake in the Gas Guarico partnership, and Sucre and PDVSA purchased 30% of Inpex’s stake in the Petroguarico joint venture.
Sources4 sources
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