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INPEX Corporation
Native name
Kokusai Sekiyu Kaihatsu-Teiseki kabushiki gaisha
"International Petroleum Exploration-Teikoku Oil stock company"
Company typePublic KK
TYO: 1605
Nikkei 225 component
TOPIX Large70 component
Founded1941 (as Teikoku Oil)
1966 (as North Sumatra Offshore Petroleum Exploration after contract with Pertamina predecessor)
HeadquartersAkasaka Biz Tower 5-3-1 Akasaka, Minato-ku, Tokyo 107-6332 Japan
Key people
Kunihiko Matsuo, Chairman
Naoki Kuroda, President
RevenueIncrease ¥ 2,324.6 billion JPY (FY 2022)
Increase ¥ 438.2 billion JPY (FY 2022)
OwnerGovernment of Japan through JOGMEC (18.96%)
Number of employees
2,146 (784 temporary workers) (2011)

INPEX Corporation is a Japanese oil company established in February 1966 as North Sumatra Offshore Petroleum Exploration Co., Ltd.[1] INPEX is the largest oil and gas exploration and production company in Japan, with global exploration, development and production projects in 20 countries.[2] In the 2020 Forbes Global 2000, INPEX was ranked as the 597th -largest public company in the world.[3]

Public listing

INPEX was listed on the first section of the Tokyo Stock Exchange on November 17, 2004 when the indebted Japan National Oil Corporation (JNOC), now part of the Japan Oil, Gas and Metals National Corporation which owned a 53.96% stake in INPEX, put up for sale 343,725 shares (17.9 percent of INPEX's 1.92 million outstanding shares). At the time, 18.9 percent of the company was owned by METI.[4] It was the second of JNOC's subsidiaries to go public, after the Japan Petroleum Exploration Company in December 2003.[1]


As a result of a government-orchestrated merger, INPEX Corporation and Teikoku Oil agree to form INPEX Holdings on April 3, 2006.[5][6][4] On October 1, 2008, the merger was completed with Inpex Corporation being formed from INPEX Holdings, INPEX, and Teikoku Oil, and the headquarters were moved to Akasaka, Tokyo.[7][8]

The Mahakam Bloc, the original INPEX's first site, was nationalized by the Government of Indonesia in 2018, and is currently operated by Pertamina.

Teikoku Oil

Teikoku Oil Company Ltd was founded as a semi-governmental company to unify the existing Japanese oil exploration companies in 1941.[9]


In the fiscal year 2011 the company had 2,146 staff, with 784 temporary employees.[11] As at 31 December 2019, INPEX had 3,117 employees on a consolidated basis.[2]

As of March 31, 2010, the INPEX Labor Union has 1,030 members. The company has a labor-management council and regular meetings are held.[12]


Operations in Japan

The main focus of the company's operations in Japan is the Minami-Nagaoka Gas Field in Niigata Prefecture.[11] INPEX also operates the Naoetsu LNG receiving terminal in Niigata and a natural gas pipeline network of approximately 1,500 km to connect to gas customers within Japan.[2]


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Main article: Ichthys gas field

INPEX created a venture company called INPEX Browse, Ltd on 1 September 1998. This was for a previously wholly owned INPEX project in the offshore Basin off the north west coast of Western Australia where a gas-field was discovered in the WA-285-P permit area. The official name of the proposed development project was to be the Ichthys (gas-field) Development, which the company wanted to base on the Maret Islands. After farming out 24% of the permit ownership to Total S.A.'s subsidiary Total E&P Australia the concept and location was changed.

The location of this project, and the issue of industrialising the Kimberley coast was under discussion in Australia at the time. Environmentalists and local ecotourism operators ware concerned about industrial infrastructure destroying the pristine nature of this coast line.[13]

The original project consisted of an offshore Central Processing Facilities (CPF), supplying two phase gas to an onshore facility on the Maret Islands. The facilities on the Maret Islands were to include gas receiving, LNG process plant (2 x 3.8Mtpa trains), product storage and export facilities. The Maret Islands are located approximately 200 km south-east of the Ichthys Field, which is approx. 440 km north of Broome and 800 km south west of Darwin.

The project for the LNG plant to be located on the isolated Maret Islands was scrapped with the LNG Plant now to be built at Bladin Point industrial site which is located on the Middle Arm Peninsula in Darwin, Northern Territory, with a 889 kilometres (552 mi) pipeline from the lchthys Field to the LNG Plant, after regulatory delays in Western Australia.[14][15]

The Ichthys Project's Front-End Engineering Design (FEED) was completed in April 2011. Final Investment Decision (FID) was announced on 13 January 2012.

In January 2012 INPEX said the 8.4 million tonne per annum (mtpa) project near Darwin will cost about $34 billion, some 60 per cent more than INPEX's original estimate of $20 billion. INPEX said it and French energy company Total, its joint venture partner, had given the final approval to the project. Total had expressed interest in increasing its stake in the project from 24% to 30%, and negotiations between the two companies were underway.

The project was estimated to contribute $3.5 billion into the Australian economy each year, and require around 2,700 workers during peak construction, and another 300 jobs ongoing once it is operational.[16]

The EPC early works phase, such as commencement of site development, infrastructure works and accommodation village and dredging began in 2012. LNG Production in the magnitude of app. 8.4mtpa is projected to be online by fourth quarter of 2016. The first shipment from the Ichthys LNG plant was made in October 2018.[17]


In November 2008, INPEX acquired a 100 per cent participating interest in the Masela Block in Indonesia.[18] Gas was discovered in 2000 when the Abadi-1 exploratory well was drilled. This marked the first discovery of crude oil and natural gas in the Arafura Sea in Tanimbar, Mollucas, Indonesia.

A development plan was submitted to the Indonesian government and subsequently approved. Preparatory measures for Front-End Engineering Design, set to begin in the first half of 2012, are currently in process.[19]

In 2017 the company is ready to start the Pre FEED phase and hold a joint workshop with SKK Migas.[20]

Eurasia region

INPEX is a minority shareholder in the Kashagan Field in Kazakhstan and the Azeri-Chirag-Guneshli project, offshore Azerbaijan in the Caspian Sea.

References and notes

  1. ^ a b The Japan Times Inpex fetches 549,000 yen in debut on first section November 18 2004 Archived 2020-04-11 at the Wayback Machine Retrieved on August 14, 2012
  2. ^ a b c INPEX 2019 Annual Report
  3. ^ "Forbes Global 2000". Forbes. Retrieved 31 October 2020.
  4. ^ a b Vivoda, Vlado. Energy Security in Japan: Challenges After Fukushima.
  5. ^ INPEX website Company Overview June 26 2012 Retrieved on August 14, 2012
  6. ^ The Japan Times Inpex books 25.76 billion yen profit August 10 2006Retrieved on August 14, 2012 Archived February 15, 2015, at the Wayback Machine
  7. ^ INPEX website History - Inpex Corporation Retrieved on August 14, 2012
  8. ^ INPEX website Message from the management October 2008 Retrieved on August 14, 2012
  9. ^ a b "History". INPEX CORPORATION. Retrieved 29 November 2019.
  10. ^ Gas, Egypt Oil & (3 January 2012). "Transglobe Energy Corporation acquires West Bakr concession..." Egypt Oil & Gas. Retrieved 29 November 2019.
  11. ^ a b Inpex website NOTICE OF THE 6th ORDINARY GENERAL MEETING OF SHAREHOLDERS p.39 June 4 2012 Retrieved on August 17, 2012
  12. ^ Inpex website Employee Development and Health Management Archived 2011-08-30 at the Wayback Machine Retrieved on August 17, 2012
  13. ^ ABC Local News
  14. ^ "Inpex chooses Darwin for LNG plant". 2008-09-26. Retrieved 2008-09-26.[permanent dead link]
  15. ^ "Darwin chosen for $12b Inpex project". Australian Broadcasting Corporation. ABC News. 2008-09-26. Retrieved 2008-09-26.
  16. ^ The Age 'Game changer' LNG project approved for Darwin January 13 2012
  17. ^ "Hit the gas: Ichthys farewells first WA LNG shipment". 23 October 2018.
  18. ^ "INPEX Asia & Oceania". INPEX Corporation. Retrieved 8 December 2011.
  19. ^ "Partnering in the Abadi Project, the Masela Block, Arafura Sea, Indonesia" (PDF). INPEX Corporation. Retrieved 8 December 2011.
  20. ^ "Inpex Asked to Accelerate Development of Masela Block". Retrieved 22 June 2017.