21 June, 2012 Correction to the Presentation Material (Appendix) of - PDF document

21 June, 2012 Correction to the Presentation Material (Appendix) of the Financial Results for the year ended March 31,2012 INPEX CORPORATION today announced that the figures of the corporate reserves reported in the Presentation Material (Appendix) of the Financial Results for the year ended March 31, 2012 which is disclosed on May 11, 2012, were fixed and therefore the following corrections have been made to the Presentation Material (Appendix). 1. Corrected Page ・ Page 11 “Proved + Probable Reserves and Proved Reserves by Region” ・ Page 12 “Upside Potential from Proved + Probable + Possible Reserves” 2. Corrections Please see attached. (Marked with underline) 3. Reason for the corrections The figures of the corporate reserves were provisional at May 11, 2012 but today they are fixed.

Proved + Probable Reserves and Original Proved Reserves by Region * Proved + Probable Reserves Proved Reserves by Region 2,432 2,500 5,000 4,774 1% 4,404 4,500 4,255 4,126 21% 2,000 4,000 8% 3,500 1,598 1,823 1,475 3,176 1,500 2% 3,000 2,929 1,308 3% 2,818 2,500 43% 2% 43% 1,000 45% 2,000 64% 13 ％ 1,500 14% 16% 2,432 500 1,000 33% 32% 1,598 1,475 28% 1,308 500 MMBOE 9% 6% MMBOE 9% 9% 0 0 2009 年 3 月 2011 年 3 月 ** 2009 年 01 月 2010 年 01 月 2011 年 01 月 2012 年 01 月 ** Mar. ‘09 Mar. ‘10 Mar. ‘11 Mar. ‘12 Mar. ‘09 Mar. ‘10 Mar. ‘11 Mar. ‘12 Japan Asia/Oceania Eurasia Middle East/Africa Americas Proved Reserves Probable Reserves * The reserves cover most of INPEX group projects including equity method affiliates, and the numbers of the reserves are provisional at present . The reserves of the projects which are expected to be invested a large amount and affect the company’ future result materially are evaluated by DeGolyer & MacNaughton, and the others are done internally. The proved reserves are evaluated in accordance with SEC regulations. The probable reserve are evaluated in accordance with SPE/WPC/AAPG/SPEE guideline (SPE ‐ PRMS) approved in March 2007. ** The way of the calculation for conversion factor from gas to oil equivalent was altered from the year ended March 31, 2012. 11 0 Proved + Probable Reserves and Corrected Proved Reserves by Region * Proved + Probable Reserves Proved Reserves by Region 2,432 2,500 5,000 4,774 1% 4,404 4,500 4,256 4,126 21% 2,000 4,000 8% 3,500 1,598 1,823 1,475 3,176 1,500 2% 3,000 2,929 1,308 3% 2,818 2,500 43% 2% 43% 1,000 45% 2,000 64% 13 ％ 1,500 14% 16% 2,432 500 1,000 33% 1,598 32% 1,475 28% 1,308 500 MMBOE MMBOE 9% 9% 9% 6% 0 0 2009 年 3 月 2011 年 3 月 ** ** Mar. ‘09 Mar. ‘11 Mar. ‘12 2009 年 01 月 2010 年 01 月 2011 年 01 月 2012 年 01 月 Mar. ‘10 Mar. ‘10 Mar. ‘09 Mar. ‘11 Mar. ‘12 Japan Asia/Oceania Eurasia Middle East/Africa Americas Proved Reserves Probable Reserves * The reserves cover most of INPEX group projects including equity method affiliates. The reserves of the projects which are expected to be invested a large amount and affect the company’ future result materially are evaluated by DeGolyer & MacNaughton, and the others are done internally. The proved reserves are evaluated in accordance with SEC regulations. The probable reserve are evaluated in accordance with SPE/WPC/AAPG/SPEE guideline (SPE ‐ PRMS) approved in March 2007. ** The way of the calculation for conversion factor from gas to oil equivalent was altered from the year ended March 31, 2012. 11 1 1

Original Upside Potential from Proved + Probable + Possible Reserves* Proved Developed Reseves Reserves Life** 6,000 (RP Ratio) Proved Undeveloped Reserves 4,878 Probable Reserves 5,000 Possible Reserves 623 623 4,255 4,000 1,823 1,823 1,823 3,000 2,432 31.4 27.4 years 2,000 years 1,453 1,453 1,453 1,453 15.6 1,000 years 980 980 980 980 0 Proved Proved Proved Probable Proved + Possible Proved + MMBOE *** Developed Undeveloped Reserves Reserves Probable Reserves Probable + Reseves Reserves Reserves Possible Reserves * The reserves cover most of INPEX group projects including equity method affiliates, and the numbers of the reserves are provisional at present. The reserves of the projects which are expected to be invested a large amount and affect the company’ future result materially are evaluated by DeGolyer & MacNaughton, and the others are done internally. The proved reserves are evaluated in accordance with SEC regulations. The probable and possible reserves are evaluated in accordance with SPE/WPC/AAPG/SPEE guideline (SPE ‐ PRMS) approved in March 2007. ** Reserves Life = Reserves as of March 31, 2012 / Production for the year ended March 31, 2012 (RP Ratio: Reserves Production Ratio) *** The way of the calculation for conversion factor from gas to oil equivalent was altered from the year ended March 31, 2012. 12 2 Corrected Upside Potential from Proved + Probable + Possible Reserves* Proved Developed Reseves Reserves Life** 6,000 (RP Ratio) Proved Undeveloped Reserves 4,877 Probable Reserves 5,000 Possible Reserves 622 622 4,256 4,000 1,823 1,823 1,823 3,000 2,432 31.4 27.4 years 2,000 years 1,453 1,453 1,453 1,453 15.6 1,000 years 980 980 980 980 0 Proved Proved Proved Probable Proved + Possible Proved + MMBOE *** Developed Undeveloped Reserves Reserves Probable Reserves Probable + Reseves Reserves Reserves Possible Reserves * The reserves cover most of INPEX group projects including equity method affiliates. The reserves of the projects which are expected to be invested a large amount and affect the company’ future result materially are evaluated by DeGolyer & MacNaughton, and the others are done internally. The proved reserves are evaluated in accordance with SEC regulations. The probable and possible reserves are evaluated in accordance with SPE/WPC/AAPG/SPEE guideline (SPE ‐ PRMS) approved in March 2007. ** Reserves Life = Reserves as of March 31, 2012 / Production for the year ended March 31, 2012 (RP Ratio: Reserves Production Ratio) *** The way of the calculation for conversion factor from gas to oil equivalent was altered from the year ended March 31, 2012. 12 3 2

Financial results for the year ended March 31, 2012 Appendix May 11, 2012 Subsidiaries and Affiliates 59 consolidated subsidiaries Major subsidiaries Country/region Ownership Stage Accounting term March (provisional Japan Oil Development UAE 100% Production settlement of account) INPEX Natuna Indonesia 100% Production March Timor Sea Joint Petroleum INPEX Sahul 100% Production December Development Area March (provisional INPEX Ichthys Pty Ltd Australia 100% Development settlement of account) INPEX Southwest Caspian Sea Azerbaijan 51% Production March (provisional settlement of account) INPEX North Caspian Sea Kazakhstan 45% Development March (provisional settlement of account) 13 equity method affiliates Major affiliates Country/region Ownership Stage Accounting term MI Berau B.V. Indonesia 44% Production December Angola Japan Oil Angola 19.6% Production December (production INPEX Offshore North Campos Brazil 37.5% December suspended) March (provisional Ichthys LNG Pty Ltd Australia 76% Development settlement of account) 1

Segment information For the year ended March 31, 2012 (April 1, 2011 through March 31, 2012) (Millions of yen) Eurasia Asia/ Adjustments Consolidated Middle Japan Americas Total (Europe/ East/Africa Oceania *1 *2 NIS) Sales to third 113,662 483,187 84,325 500,032 5,524 1,186,731 ― 1,186,731 parties Segment income 24,606 299,598 47,075 354,135 (5,517) 719,899 (10,542) 709,357 (loss) Segment assets 260,596 445,735 515,537 198,987 67,928 1,488,784 1,577,613 3,066,397 Note: 1. (1) Adjustments of segment income of ¥(10,542) million include elimination of intersegment transactions of ¥229 million and corporate expenses of ¥(10,771) million. Corporate expenses are mainly amortization of goodwill not attributable to a reportable segment and general administrative expenses. (2) Adjustments of segment assets of ¥1,577,613 million include elimination of intersegment transactions of ¥(2,744) million and corporate assets of ¥1,580,357 million. Corporate assets are mainly goodwill, cash and deposit, marketable securities and investment securities concerned with the administrative divisions. 2. Segment income was reconciled with consolidated operating income. 2 Analysis of Net Sales Increase (Billions of Yen) Crude Oil 198.1 1,600 Natural Gas (including LPG) 135.8 Crude Oil (59.3) 1,400 Crude Oil +29.4 Natural Gas (including LPG) (29.1) 334.0 Natural Gas (including LPG) (33.8) 2.5 1,200 (88.4) 1,000 (4.4) 800 600 1,186.7 943.0 400 200 0 Net Sales Decrease in Increase in Exchange rate Net Sales Others Mar. ‘11 Sales Volume Unit Price (Appreciation of Yen) Mar. ’12 3