PTTEP Operations Overview

Supplementary Index: Ratio & Formula Ratio Formula Lifting Cost ($/BOE) (Operating Exp. - Transportation Cost - Stock Variation - Other expenses not related to lifting) / Production Volume (Operating Exp. + Exploration Exp. + G&A + Royalties + Finance Cost) / Sales Volume (Operating Exp. + Exploration Exp. + G&A + Royalties + Finance Cost + DD&A) / Sales Volume Cash Cost ($/BOE) Unit Cost ($/BOE) Reserves Replacement Ratio Reserves Life Index (Year) Success Ratio Sales Revenue EBITDA EBITDA Margin Return on Equity Return on Capital Employed Simple Effective Tax Rate Total debt Net debt Debt to Equity Net Debt to Equity Total Debt to Capital Total Debt to EBITDA Net Debt to EBITDA EBITDA Interest Coverage Ratio 5-Yr Additional Proved Reserves / 5-Yr Production Volume Proved Reserves / Production Volume Number of wells with petroleum discovery / Total number of exploration and appraisal wells Sales + Revenue from pipeline transportation (Sales + Revenue from pipeline transportation) - (Operating expenses + Exploration expenses + Administrative expenses + Petroleum royalties and remuneration + Management's remuneration) EBITDA / Sales Revenue Trailing-12-month net income / Average shareholders' equity between the beginning and the end of the 12-month period (Trailing-12-month net income + Trailing-12-month Interest Expenses & Amortization of Bond Issuing Cost)/(Average shareholders' equity and average total debt between the beginning and the end of the 12-month period) Income tax expenses / Income before income taxes Short-term loans from financial institution + Current portion of long-term debts + Bonds + Long-term loans from financial institution Total debt-Liquidity Total debt/ Shareholders' equity Net debt / Shareholders' equity Total debt/ (Total debt + Shareholders' equity) Total debt/Trailing-12-month EBITDA Net debt/Trailing-12-month EBITDA Trailing-12-month EBITDA / Trailing-12-month Interest Expenses & Amortization of Bond Issuing Cost 43 PTTEP

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