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Financial Information: Reserves/Production Indices

  • Reserves to production ratio (Years) = Reserves as of the end of the fiscal year / Production in the fiscal year
  • Reserve replacement ratio = Proved reserves increase including acquisition / Production
  • Production cost from the year ended March 31, 2010 to the year ended March 31, 2017 has been revised to reflect changes in royalty.
  • Finding and development cost per boe = The sum of total costs incurred for exploration and development of oil and gas fields and total costs incurred for acquisitions / The sum of proved reserve extensions, acquisitions and revisions
  • Exploration success ratio = The number of net productive exploratory wells drilled / The number of net exploratory wells drilled
    Exploratory well: An exploratory well is a well drilled to find a new field, to find a new reservoir in a field previously found to be productive of oil or gas in another reservoir or to extend the limits of a known reservoir.

↓This table is scrollable horizontally.

Years ended March 31 2015 2016 2017 2018 2019
Net proved reserves (MM boe) 2,434 3,264 3,304 3,857 4,010
Net probable reserves (MM boe) 1,610 1,705 1,389 1,443 1,202
Net production (Thousand boe/day) 408 514 521 450 424
Reserves to production ratio (Years)          
Proved reserves 16.4 17.4 17.4 23.5 25.9
Proved reserves + Probable reserves 27.2 26.4 24.7 32.4 33.7
Reserve replacement ratio (3-year average, %)* 100 321 246 362 246
Average expenses per boe produced (US$)          
Production cost 17.8 12.6 11.2 12.8 13.5
Production cost (Excluding royalty) 11.2 7.8 6.1 5.9 5.7
Selling, general and administrative expenses 3.5 2.6 2.1 2.7 2.7
Finding and development cost per boe
(3-year average US$)
58.2 16.9 15.7 7.7 9.2
Exploration success ratio (3-year average, %) 52.9 45.3 43.8 21.0 60.7

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