Disclosure of supplementary information on oil and gas exploration and production activities

No definition available.

Future net cash flows relating to proved oil and gas reserves cash flows before tax.

No definition available.

Future net cash flows relating to proved oil and gas reserves future production and excess gains taxes.

No definition available.

Amount of discounted future accumulated cash inflows relating to proved oil and gas reserves.

No definition available.

Amount of estimated future accumulated cash inflow for proved oil and gas reserves.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Form 20-F
-Number Part II
-Section Item 18
-Subparagraph (Instruction 2)
-Publisher SEC

Amount of estimated future accumulated cash outflow for costs to be incurred in developing proved oil and gas reserves.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Form 20-F
-Number Part II
-Section Item 18
-Subparagraph (Instruction 2)
-Publisher SEC

Amount, before discount and after future accumulated cash outflow for development and production costs and future income tax expense, of estimated future accumulated cash inflow for proved oil and gas reserves.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Form 20-F
-Number Part II
-Section Item 18
-Subparagraph (Instruction 2)
-Publisher SEC

Amount of estimated future accumulated cash outflow for costs to be incurred in producing proved oil and gas reserves.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Form 20-F
-Number Part II
-Section Item 18
-Subparagraph (Instruction 2)
-Publisher SEC

Amount of discount on estimated future accumulated cash inflow, after future accumulated cash outflow for development and production costs and future income tax expense, for proved oil and gas reserves, using discount rate of 10 percent per year.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Form 20-F
-Number Part II
-Section Item 18
-Subparagraph (Instruction 2)
-Publisher SEC