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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 FY2016)
Venture company(established) Interest owned(*Operator)
(As of June 30, 2017)
Offshore Mahakam In production
-Crude oil: 68 Mbbld
-Natural gas: 1,362 MMcf/d
-LPG: 7 Mbbld
(February 21, 1966)
TOTAL* 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) fields, as well as the South Mahakam Gas Fields (gas), 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 by advancing efforts to counter sand problems and accelerate the pace at which the Company undertakes development well drilling. Despite these endeavors, production is still expected to decrease gradually in the future.
INPEX has been in discussions with Pertamina and TOTAL concerning participation in the block after 2018.

photo:Handil oil Field

Handil Oil Field

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 FY2016)
Venture company(established) Interest owned(*Operator)
(As of June 30, 2017)
Sebuku In production
-Natural gas: 77 MMcf/d
INPEX South Makassar, Ltd.
(May 17, 2010)
INPEX South Makassar 15%
PEARL OIL(Sebuku) Ltd.* 70%

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, 2017)
Masela Preparation for development INPEX Masela, Ltd.
(December 2, 1998)
INPEX Masela* 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 the 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.

INPEX drilled three more appraisal wells in 2013 and 2014 with the aim of expanding the volume of recoverable reserves, confirming a greater volume of natural gas reserves that were certified by the Indonesian authorities. Having revised its concept selection studies to factor in this increased volume of reserves, INPEX decided it would be optimal to center development on a large-scale FLNG. The Company submitted a revised plan for the development based on an FLNG plant with an annual LNG processing capacity of 7.5 million tons to the Indonesian authorities in September 2015. In April 2016, however, the Company received a notification from the Indonesian authorities instructing it to re-propose a plan of development based on onshore LNG. The Company's policy of aiming for the early start-up of development and implementing the project in the most economically and technically rational way in alignment with the policies of the Indonesian government remains unchanged. In accordance with this policy, based on the constructive discussions with the Indonesian government regarding the development of the project based on an onshore LNG development scheme, INPEX has begun preparations for the commencement of Pre-FEED work.

photo:Image of development

Drillship for the Abadi LNG Project

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 FY2016)
Venture company(established) Interest owned(*Operator)
(As of June 30, 2017)
Berau In production
-Crude oil: 6 Mbbld
-Natural gas: 1,023 MMcf/d
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 40.22%
CNOOC 13.90%
Nippon Oil Exploration (Berau) 12.23%
KG Berau 8.56%
LNG Japan 7.35%
KG Wiriagar 1.44%

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.

The FID for expanding the Tangguh LNG Project was announced in July 2016. The Tangguh Expansion Project will add a third LNG process train with 3.8 million tons per annum (mtpa) of production capacity to the existing two trains with 7.6 mtpa of production capacity. Plans call for production to commence in 2020.

Shipping facility

Shipping facility

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