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Offshore Mahakam Block and Attaka Unit

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Contract area(block) Project status
(production on the basis of all fields and average rate of FY2013)
Venture company(established Interest owned(*Operator)
(As of June 30, 2014)
Offshore Mahakam In production
-Crude oil: 72 Mbbl/d
-Natural gas: 1,391 MMcf/d
(Volume not at wellheads but corresponding to the sales to buyers)
-LPG: 12 Mbbl/d
INPEX
(Est. February 21, 1966)
INPEX 50%
TOTAL* 50%
Attaka Unit INPEX CORPORATION 50%
Chevron* 50%

INPEX entered into a production sharing contract (PSC) with the Indonesian Government in October 1966, at that time acquiring a 100% interest in the Offshore Mahakam Block. The Attaka Unit was established in April 1970 through the unitization of part of the adjacent blocks owned by INPEX and Unocal (now Chevron), with each company taking a 50% interest. Production of crude oil and natural gas has continued since 1972. INPEX farmed out 50% of its interest in the Offshore Mahakam Block to CFP (now TOTAL) in July 1970. This venture subsequently made a series of discoveries in the Bekapai (oil), Handil (oil), Tambora (oil and gas), Tunu (gas), Peciko (gas), Sisi and Nubi (gas), as well as the South Mahakam (gas), fields, each of which has continued to produce crude oil and natural gas. The crude oil and condensate produced from these fields are shipped mainly to oil refineries and power companies in Japan by tanker from the Santan and Senipah terminals. Most of the natural gas is supplied to the Bontang LNG Plant, and then shipped as LNG to customers in Japan and elsewhere.

The Offshore Mahakam Block has begun to see output decline after more than 40 years of production. In 2012, impediments at production wells led to a large drop in output, in addition to natural attrition. Thereafter, successful steps were taken to control the decline in production. In addition to measures aimed at counteracting sand problems, INPEX accelerated the pace at which it undertook development well drilling. Production volumes have remained stable since 2013.

The PSC for the Offshore Mahakam Block expires at the end of 2017. Together with TOTAL (the operator), we have been engaged in negotiations with the Indonesian authorities to secure a contract extension beyond 2018.


photo:Handil oil Field

Handil Oil Field

South Natuna Sea Block B

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Contract area(block) Project status
(production on the basis of all fields and average rate of FY2013)
Venture company(established Interest owned(*Operator)
(As of June 30, 2014)
South Natuna Sea Block B In production
-Crude oil: 31 Mbbl/d
-Natural gas: 333 MMcf/d
(Volume not at wellheads but corresponding to the sales to buyers)
-LPG: 12 Mbbl/d
INPEX Natuna, Ltd.
(Est. September 1, 1978)
INPEX 35%
ConocoPhillips* 40%
Chevron 25%

In July 1977, INPEX acquired a 17.5% interest in the South Natuna Sea Block B in Indonesia. Later, in January 1994, INPEX increased its total interest in the block to 35% with the purchase of an additional interest. Crude oil production began in 1979, and supplies of natural gas to Singapore via Indonesia's first international pipeline commenced in 2001. Additional deliveries of natural gas from this pipeline to Malaysia started in 2002. These supply milestones contributed to the extension of the PSC covering the block until 2028.

Production operations in the Belanak oil and gas field, which is part of South Natuna Sea Block B, utilize a world-class floating production, storage and offloading (FPSO) system. Production of crude oil and condensate began in December 2004, with LPG production commencing in April 2007. After 2006 at this same block, production began at the Hiu Gas, Kerisi Oil and Gas, North Belut Gas and Bawal Gas fields. Most recently, production commenced at the South Belut Gas Field in April 2014.


photo:Belanak oil and gas Field FPSO

Belanak oil and gas Field FPSO

Sebuku Block Ruby Gas Field

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Contract area(block) Project status
(production on the basis of all fields and average rate of FY2013)
Venture company(established Interest owned(*Operator)
(As of June 30, 2014)
Sebuku In production
-Natural gas: 35 MMcf/d
(Volume not at wellheads but corresponding to the sales to buyers)
INPEX South Makassar, Ltd.
(Est. May 17, 2010)
INPEX 15%
PEARL OIL(Sebuku) Ltd.* 70%
TOTAL 15%

In September 2010, INPEX obtained a 15% interest in the Sebuku Block off the shore of South Makassar, Indonesia. Thereafter, work began to develop the Ruby Gas Field in the block, and production of natural gas followed in October 2013. The natural gas produced here is transported from offshore production facilities via undersea pipeline to onshore storage facilities that receive products from the Offshore Mahakam Block. The natural gas is then mainly sent via inland pipeline to a fertilizer plant in East Kalimantan.

Sebuku Block Ruby Gas  Field

Abadi LNG Project

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Contract area(block) Project status Venture company(established Interest owned(*Operator)
(As of June 30, 2014)
Masela Preparation for development INPEX Masela, Ltd.
(Est. December 2, 1998)
INPEX* 65%
Shell 35%

INPEX acquired a 100% interest in the Masela Block in November 1998 through an open bid conducted by the Indonesian Government. INPEX proceeded with exploratory activity as the operator, and the first exploratory well drilled in 2000 discovered the Abadi Gas Field. Subsequently, six appraisal wells were drilled (two in 2002 and four in 2007–2008), all of which confirmed the presence of gas and condensate reservoirs. The Indonesian Government granted its approval of the Stage-1(POD-1) development plan involving a "floating LNG" with a capacity of 2.5 tons per year of LNG in December 2010. Thereafter, INPEX undertook FEED work for subsea production facilities from November 2012 to January 2014. In addition, INPEX continues to engage in FLNG FEED work, which began in January 2013. After FEED work is completed, we will turn our attention to contractor selection and LNG marketing in preparation for making a final investment decision.

We continue to study the feasibility of developing the entire field based on proven reserves of gas. Aiming to increase the amount of exploitable reserves, INPEX undertook the drilling of three additional appraisal wells and one exploratory well from June 2013 to June 2014.


photo:Image of development

Drilling campaign

Berau Block Tangguh LNG Project

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Contract area(block) Project status
(production on the basis of all fields and average rate of FY2013)
Venture company(established Interest owned(*Operator)
(As of June 30, 2014)
Berau In production
-Crude oil: 6 Mbbl/d
-Natural gas: 986 MMcf/d
(Volume not at wellheads but corresponding to the sales to buyers)
MI Berau B.V.
(August 14, 2001)
MI Berau 22.856%
*BP 48.0%
Nippon Oil Exploration (Berau) 17.144%
KG Berau 12.0%
Tangguh Unit MI Berau 16.3%
*BP 37.16%
CNOOC 13.9%
Nippon Oil Exploration (Berau) 12.23%
KG Berau, KG Wiriagar 10.0%
LNG Japan 7.35%
Talisman 3.06%

MI Berau B.V., jointly established by INPEX and Mitsubishi Corporation, acquired an interest in the Berau Block in October 2001. In October 2007, MI Berau Japan Ltd., a joint venture with Mitsubishi Corporation, acquired a stake in KG Berau Petroleum Ltd., effectively increasing the Company's interest to around 7.79% in the Tangguh LNG Project. In March 2005, the Indonesian Government approved an extension of the production sharing contract (PSC) and project development plans for the Tangguh LNG Project through 2035. Development work commenced thereafter, and the first shipments of LNG began in July 2009.


Shipping facility

Shipping facility

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