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*JPDA: The Timor Sea Joint Petroleum Development Area |
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| Contract Area | Venture Company | Interest Owned |
| * Operator (As of December 31, 2009) | ||
| WA-12-L (Deep) | INPEX Alpha, Ltd. (Est. February 17, 1989) |
INPEX Alpha 18.67% ExxonMobil* 81.33% |
| WA-155-P (Part I) | INPEX Alpha 28.5% BHPBP* 39.999% Apache 31.501% |
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| Van Gogh Defined Area | INPEX Alpha 47.499% Apache* 52.501% |
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| WA-155-P (Part II) | INPEX Alpha 18.67% Apache* 81.33% |
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| WA-357-P | INPEX Alpha 35% Apache* 65% |
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| WA-35-L (Excluding Van Gogh Defined Area) |
INPEX Alpha 47.499% Apache* 52.501% |
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| WA-255-P Block 1081 | INPEX Alpha 23.7495% Apache* 26.2505% Woodside 50.0000% |
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| WA-43-L | INPEX Alpha 28.5% BHPBP* 39.999% Apache 31.501% |
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INPEX acquired a 20% working interest in the WA-210-P offshore Western Australia in February 1989. Subsequent exploration activities resulted in the discovery of the Griffin oil fields. The Australian government granted a production license (WA-10-L) for the contract area covering four blocks that include the fields. Commercial crude oil and natural gas production from the fields commenced in January 1994. After 15 years of production, the joint venture of the Griffin oil fields ceased the production due to natural depletion.
INPEX later acquired working interests for areas around the WA-10-L. These comprised interests in the WA-155-P (Part II) and the WA-12-L (Deep) in July 1994, in the WA-155-P (Part I) in July 1999, in the WA-357-P in July 2006, and in a block of the WA-255-P in March 2009. The Van Gogh and Ravensworth oil fields were discovered in the WA-155-P (Part I). It was agreed among the partners to develop the Van Gogh field in April 2007. The Australian government granted a production license (WA-35-L) for the two blocks which includes the Van Gogh field in the WA-35-L contract area in October 2008.
Development work is underway with a target production start-up in the first quarter of 2010. A final investment decision was taken to develop the Ravensworth field in November 2007. The Australian government granted a production license (WA-43-L) to the Ravensworth field in November 2009, and development is proceeding toward a scheduled production start-up in late 2010.





