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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 FY2014)
Venture company(established) Interest owned(*Operator)
(As of June 30, 2015)
Offshore Mahakam In production
-Crude oil: 72 Mbbl/d
-Natural gas: 1,257 MMcf/d
(Volume not at wellheads but corresponding to the sales to buyers)
-LPG: 11 Mbbl/d
INPEX
(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.


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 FY2014)
Venture company(established) Interest owned(*Operator)
(As of June 30, 2015)
South Natuna Sea Block B In production
-Crude oil: 27 Mbbl/d
-Natural gas: 354 MMcf/d
(Volume not at wellheads but corresponding to the sales to buyers)
-LPG: 12 Mbbl/d
INPEX Natuna, Ltd.
(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, 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

FPSO vessel

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 FY2014)
Venture company(established) Interest owned(*Operator)
(As of June 30, 2015)
Sebuku In production
-Natural gas: 73 MMcf/d
(Volume not at wellheads but corresponding to the sales to buyers)
INPEX South Makassar, Ltd.
(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, 2015)
Masela Preparation for development INPEX Masela, Ltd.
(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 and subsequently went about exploratory activities as Operator, discovering the Abadi Gas Field through the first exploratory well drilled in 2000. The company subsequently drilled two appraisal wells in 2002 and four in 2007– 2008, all of which confirmed the presence of gas and condensate reservoirs. In December 2010, Indonesian authorities approved the initial plan of development (POD-1) deploying a floating LNG (FLNG) plant with an annual processing capacity of 2.5 million tons, and from November 2012 to November 2014, INPEX undertook SURF (subsea, umbilical, riser and flowline) and FLNG FEED work. Meanwhile, INPEX also has studied the feasibility of full field development, drilling three appraisal wells between 2013 and 2014 with the aim of expanding the volume of recoverable reserves. Evaluations of these wells resulted in the confirmation of a substantially greater volume of natural gas reserves, which was certified by Indonesian authorities. Taking those into consideration, INPEX is studying ways to optimize development plans centered on a large-scale FLNG and is currently in discussions with the Indonesian government.


photo:Image of development

Drilling campaign

Tangguh LNG Project (Berau Block)

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Contract area(block) Project status
(production on the basis of all fields and average rate of FY2014)
Venture company(established) Interest owned(*Operator)
(As of June 30, 2015)
Berau In production
-Crude oil: 6 Mbbl/d
-Natural gas: 1,027 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 48.000%
Nippon Oil Exploration (Berau) 17.144%
KG Berau 12.000%
Tangguh Unit MI Berau 16.30%
*BP 37.16%
CNOOC 13.90%
Nippon Oil Exploration (Berau) 12.23%
KG Berau, KG Wiriagar 10.00%
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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