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Percent of discounted future net cash flow estimates prepared by external reserve engineers

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Percent Of Proved Crude Oil Reserve Estimates Prepared By External Reserve Engineers.

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Percent Of Proved Natural Gas Reserve Estimates Prepared By External Reserve Engineers

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Proved Developed And Undeveloped Reserve Extensions Discoveries And Additions One

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Proved Developed And Undeveloped Reserve Revisions Of Previous Estimates Increase Decrease One

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Weighted average price utilized in computation of future cash inflows

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Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 5

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447

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Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 5

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447

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