Attachment 3: Supplemental Information on Petroleum Exploration and
Production Activities

(A) PTTEP and its Subsidiaries’ Petroleum Reserves Report As of December
    31, 2011

The total Proved Reserves of PTT Exploration and Production Public
Company Limited (PTTEP) and its subsidiaries as of December 31, 2011 are
shown in the attached table. The Proved Reserves are reviewed annually
by company’s earth scientists and reservoir engineers to ensure rigorous
professional standards. The Proved Reserves are reported on a gross
basis, which includes the company’s net working interest and related
host country’s interest.

No reserve quantities have been recorded for the hydrocarbon discoveries
in Vietnam B & 48/95 Project and Vietnam 52/97 Project since no Gas
Sales Agreement (GSA) has been established.

The total Proved Reserves (Consolidated Companies) as of December 31,
2011 of PTTEP and its subsidiaries are 275 Million Stock Tank Barrels
(MMSTB) for crude and condensate¹, and 4,529 Billion Standard Cubic Feet
(BSCF) for gas. The total Proved Reserves (Consolidated Companies) in
term of oil equivalent are 969 Million Barrels (MMBOE), of which
approximately 47 percent of the total Proved Reserves is Proved
Developed Reserves. Proved Reserves of crude and condensate are
approximately 28% while, for gas, are 72% of the total Proved Reserves
in terms of oil equivalent.

The total production in 2011 (Consolidated Companies) was 110.0 MMBOE
(30 MMSTB of crude and condensate¹, and 501 BSCF of gas) or the
production rate of approximately 301,367 Barrels of Oil Equivalent per
Day (BOED). The decrease was approximately 2,656 BOED or 0.87% lower
than that of last year. The production decrease was attributed to the
unexpected inundation in the Northern and Central Regions of Thailand in
the fourth quarter of 2011, resulting in lower oil production from
Thailand Onshore fields as well as lower gas nominations from gas
projects in the Gulf of Thailand and the Gulf of Martaban due to lower
demands. However, these production decreases were offset by 2 new
overseas projects, namely Canada KKD Oil Sands and Vietnam 16-1 projects
that were put on production in 2011.

¹ Included the proved reserves and production of LPG and Bitumen

[TABLE]

(1) The proved reserves are reported on a gross basis which includes the
    company's net working interest and the related host country’s
    interest.

(2) Included the proved reserves and production of LPG and Bitumen.

(B) Capitalized costs relating to oil and gas producing activities

Capitalized costs represent cumulative expenditures for proved and
unproved properties, and support equipment and facilities used in oil
and gas exploration and production operations together with related
accumulated depreciation, depletion, amortization and impairment.

Proved properties include exploration & development wells, equipment,
transportation pipeline and related producing facilities associated with
proved reserves project. Unproved properties represent amounts
associated with non-proved reserve project. Support equipment and
facilities include warehouse, field offices, vehicles and movable assets
used in oil and gas producing activities.

The net capitalized costs represent the undepreciated value for these
assets.

  -------------------------------------------- ------------- -------------
  (Unit: Million US Dollar)                    2011          2010

  Proved properties                            14,458        10,889

  Unproved properties                          1,107         173

  Accrued decommissioning costs                695           750

  Support equipment and facilities             153           120

  Gross capitalized costs                      16,413        11,932

  Accumulated depreciation, depletion,         (6,089)       (5,034)
  amortization and impairment                                

  Net capitalized costs                        10,324        6,898

                                                             
  -------------------------------------------- ------------- -------------

(C) Costs Incurred in oil and gas property acquisition, exploration, and
    development activities

Costs incurred in oil and gas property acquisition, exploration and
development activities represent amounts both capitalized and charged to
expense during the year. Property acquisition costs include costs to
purchase proved and unproved properties.

Exploration costs include the costs of geological and geophysical work,
carrying and retaining undeveloped properties, and drilling and
equipping exploratory wells.

Development costs include costs associated with drilling and equipping
development wells, improved recovery systems, facilities for extraction,
treating, gathering and storage, producing facilities for existing
developed reserves, and costs associated with transportation pipeline.

  ------------------------ ---------- --------- ------- ---------- --------- -------
                           2011                         2010                 

  (Unit: Million US        Domestic   Foreign   Total   Domestic   Foreign   Total
  Dollar)                                                                    

  Acquisition of                                                             
  properties                                                                 

  - Proved                 -          1         1       1          -         1

  - Unproved               -          704       704     -          -         -

  Exploration costs ⁽¹⁾    144        309       453     62         158       220

  Development costs        989        2,773     3,762   1,111      312       1,423

  Total                    1,133      3,787     4,920   1,174      470       1,644

                                                                             
  ------------------------ ---------- --------- ------- ---------- --------- -------

(1) Exploration costs include transferring of exploration well costs to
    development well costs for future production.

(D) Results of operations for producing activities

Results of operations from oil and gas producing activities for the year
2010 and 2009 are shown in the following table.

Operating costs include lifting costs incurred to operate and maintain
productive wells and related equipment. Exploration expenses consist of
geological and geophysical costs, and dry hole costs.

General administrative expenses are expenses directly related to oil and
gas producing activities.

Depreciation, Depletion and Amortization expense relates to capitalized
costs incurred in acquisition, exploration and development activities,
transportation pipeline, including amortized decommissioning costs.

Other income/expenses include pipeline transportation income and foreign
exchange gains and losses.

Income tax expenses are based on the results of operations from
petroleum producing activities.

General corporate overhead and finance costs are excluded from the
results of operations for petroleum producing activities.

+-------------------------------+------+-----+------+-----+-----+-----+
|                               | 2011 |     |      | 2   |     |     |
|                               |      |     |      | 010 |     |     |
+===============================+======+=====+======+=====+=====+=====+
| (Unit: Million US Dollar)     | Dome | F   | T    | Do  | F   | To  |
|                               | stic | ore | otal | mes | ore | tal |
|                               |      | ign |      | tic | ign |     |
+-------------------------------+------+-----+------+-----+-----+-----+
| Gross revenues :              |      |     |      |     |     |     |
+-------------------------------+------+-----+------+-----+-----+-----+
|  Sales – Related parties      | 4    | 412 | 4    | 3,  | 348 | 3,  |
|                               | ,185 |     | ,597 | 466 |     | 814 |
+-------------------------------+------+-----+------+-----+-----+-----+
|  Sales – Third parties        | 391  | 452 | 843  | 331 | 185 | 516 |
+-------------------------------+------+-----+------+-----+-----+-----+
|  Total Sales                  | 4    | 864 | 5    | 3,  | 533 | 4,  |
|                               | ,576 |     | ,440 | 797 |     | 330 |
+-------------------------------+------+-----+------+-----+-----+-----+
| Expenses :                    |      |     |      |     |     |     |
+-------------------------------+------+-----+------+-----+-----+-----+
| Operating expenses            | 407  | 216 | 623  | 352 | 103 | 455 |
+-------------------------------+------+-----+------+-----+-----+-----+
| Exploration expenses          | 30   | 187 | 217  | 23  | 63  | 86  |
+-------------------------------+------+-----+------+-----+-----+-----+
|   General administrative      | 77   | 66  | 143  | 66  | 35  | 101 |
|   expenses                    |      |     |      |     |     |     |
+-------------------------------+------+-----+------+-----+-----+-----+
|   Petroleum royalties and     | 574  | 72  | 646  | 477 | 49  | 526 |
|   remuneration                |      |     |      |     |     |     |
+-------------------------------+------+-----+------+-----+-----+-----+
| Depreciation, depletion and   | 897  | 210 | 1    | 834 | 176 | 1,  |
| amortization                  |      |     | ,107 |     |     | 010 |
+-------------------------------+------+-----+------+-----+-----+-----+
| Loss from Montara Incident    | -    | 5   | 5    | -   | 14  | 14  |
+-------------------------------+------+-----+------+-----+-----+-----+
| Other (income)/ expenses      | 4    | (1  | (    | (   | (   | (1  |
|                               |      | 85) | 181) | 45) | 72) | 17) |
+-------------------------------+------+-----+------+-----+-----+-----+
| Total expenses                | 1    | 571 | 2    | 1,  | 368 | 2,  |
|                               | ,989 |     | ,560 | 707 |     | 075 |
+-------------------------------+------+-----+------+-----+-----+-----+
|   Results before income taxes | 2    | 293 | 2    | 2,  | 165 | 2,  |
|                               | ,587 |     | ,880 | 090 |     | 255 |
+-------------------------------+------+-----+------+-----+-----+-----+
| Income tax expenses (benefit) | 1    | 100 | 1    | 700 | 30  | 730 |
|                               | ,058 |     | ,158 |     |     |     |
+-------------------------------+------+-----+------+-----+-----+-----+
| Net results of operations     | 1    | 193 | 1    | 1,  | 135 | 1,  |
|                               | ,529 |     | ,722 | 390 |     | 525 |
+-------------------------------+------+-----+------+-----+-----+-----+
|                               |      |     |      |     |     |     |
+-------------------------------+------+-----+------+-----+-----+-----+

(E) Standardized Measure of Discounted Future Net Cash Flows (SMDCF)
    Relating to Proved Oil and Gas Reserves

The standardized measure of discounted future net cash flows related to
the above proved oil and gas reserves, is computed by applying 12-month
average prices* (with consideration of price changes only to the extent
provided by contractual arrangements), to the estimated future
production of year-end proved oil and gas reserves remaining less
estimated future expenditures (based on year-end costs) to be incurred
in developing and production the proved reserves.

Future income taxes are calculated by applying the appropriate year-end
statutory tax rates to the future pre-tax net cash flows and reduced by
applicable tax deductions or tax credits.

Net Cash flows are discounted using a rate of 10% per year to reflect
the estimated timing of the future cash flows.

Discounted future cash flow estimates like those shown below are not
intended to represent estimates of the fair value of oil and gas
properties. Estimates of fair value should also consider probable and
possible reserves which may become proved reserves in the future,
anticipated future oil and gas prices, interest rates, changes in
development and production costs and risks associated with future
production. Because of these and other considerations, any of fair value
is necessarily subjective and imprecise.

* Twelve-month average prices are calculated as the unweighted
arithmetic average of the first-day-of-the-month price for each month.

+------------------------+------+------+------+------+-------+-------+
| (Unit: Million US      | Dome |      | For  |      | Total |       |
| Dollar)                | stic |      | eign |      |       |       |
+------------------------+------+------+------+------+-------+-------+
|                        | 2011 | 2010 | 2011 | 2010 | 2011  | 2010  |
+------------------------+------+------+------+------+-------+-------+
| Future cash inflows    | 23   | 21   | 21   | 14   | 4     | 3     |
|                        | ,196 | ,050 | ,038 | ,847 | 4,234 | 5,897 |
+------------------------+------+------+------+------+-------+-------+
| Future production      | (2,  | (2,  | (4,  | (2,  | (7    | (4    |
| costs                  | 649) | 438) | 816) | 218) | ,465) | ,656) |
+------------------------+------+------+------+------+-------+-------+
| Future development     | (6,  | (4,  | (3,  | (3,  | (9    | (8    |
| costs                  | 233) | 973) | 070) | 112) | ,303) | ,085) |
+------------------------+------+------+------+------+-------+-------+
| Future income tax      | (4,  | (3,  | (2,  | (2,  | (7    | (6    |
| expenses               | 351) | 706) | 796) | 368) | ,147) | ,074) |
+------------------------+------+------+------+------+-------+-------+
| Future net cash flows  | 9    | 9    | 10   | 7    | 2     | 1     |
|                        | ,963 | ,933 | ,356 | ,149 | 0,319 | 7,082 |
+------------------------+------+------+------+------+-------+-------+
| 10% annual discount    | (2,  | (2,  | (4,  | (3,  | (7    | (6    |
|                        | 793) | 915) | 727) | 786) | ,520) | ,701) |
+------------------------+------+------+------+------+-------+-------+
| Standardized measure   | 7    | 7    | 5    | 3    | 1     | 1     |
| of discounted future   | ,170 | ,018 | ,629 | ,363 | 2,799 | 0,381 |
| net cash flows (SMDCF) |      |      |      |      |       |       |
+------------------------+------+------+------+------+-------+-------+

Changes in Standardized Measure of Discounted Future Net Cash Flows
Relating to Proved Oil and Gas Reserves

  ---------------------------------------------- ------------ ------------
  (Unit: Million US Dollar)                      2011         2010

  Present value at beginning of year             10,381       9,012

  Sales and transfers of oil and gas produced,   (4,100)      (3,492)
  net of production costs                                     

  Development costs incurred during the period   1,880        2,128

  Net changes in prices and production costs     8,970        1,844

  Net changes in development costs               (2,902)      (1060)

  Extensions, discoveries and improved recovery  1,474        804

  Revisions of previous quantity estimates       (454)        423

  Purchases / sales of petroleum in place        (565)        0

  Accretions of discount                         (811)        601

  Net changes in income taxes                    (1,074)      121

  Present value at the year end                  12,799       10,381
  ---------------------------------------------- ------------ ------------

(F) Other information

  Productive Oil/Condensate and Gas Wells

  The numbers of productive wells at December 31, 2011 were as follows:

+----------------------------------+---------+-------+-------+-------+---+
|                                  | O       |       | Gas   |       |   |
|                                  | il/Cond |       |       |       |   |
|                                  | ensate* |       |       |       |   |
+----------------------------------+---------+-------+-------+-------+---+
|                                  | Gross   | Net   | Gross | Net   |   |
+----------------------------------+---------+-------+-------+-------+---+
| Thailand                         | 684     | 288   | 1,006 | 377   |   |
+----------------------------------+---------+-------+-------+-------+---+
| Foreign                          |         |       |       |       |   |
+----------------------------------+---------+-------+-------+-------+---+
| Southeast Asia                   | 12      | 3     | 95    | 41    |   |
+----------------------------------+---------+-------+-------+-------+---+
| Middle East and Others           | 21      | 9     | 8     | 8     |   |
+----------------------------------+---------+-------+-------+-------+---+
| Total                            | 717     | 300   | 1,109 | 426   |   |
+----------------------------------+---------+-------+-------+-------+---+

* include Bitumen Wells

  Drilling in Progress of Oil/Condensate* and Gas Wells

  The numbers of wells in progress at December 31, 2011 were as follows:

+----------------------------------+------+-----------+---+-----------+
|                                  |      |   Gross   |   | Net       |
+----------------------------------+------+-----------+---+-----------+
| Exploratory                      |      |           |   |           |
+----------------------------------+------+-----------+---+-----------+
| Thailand                         |      |   2       |   | 2         |
+----------------------------------+------+-----------+---+-----------+
| Foreign                          |      |           |   |           |
+----------------------------------+------+-----------+---+-----------+
| Southeast Asia                   |      |   1       |   | 0.5       |
+----------------------------------+------+-----------+---+-----------+
| Middle East and Others           |      |   2       |   | 0.6       |
+----------------------------------+------+-----------+---+-----------+
| Total                            |      |   5       |   | 3.1       |
+----------------------------------+------+-----------+---+-----------+

  Development

+----------------------------------+------+-----------+---+-----------+
| Thailand                         |      | 21        |   |   10.5    |
+----------------------------------+------+-----------+---+-----------+
| Foreign                          |      |           |   |           |
+----------------------------------+------+-----------+---+-----------+
| Southeast Asia                   |      | 4         |   |   1.1     |
+----------------------------------+------+-----------+---+-----------+
| Australia                        |      | 1         |   |   0.9     |
+----------------------------------+------+-----------+---+-----------+
| Middle East and Others           |      | 2         |   |   1.4     |
+----------------------------------+------+-----------+---+-----------+
| Total                            |      | 28        |   |   13.9    |
+----------------------------------+------+-----------+---+-----------+

* include Bitumen Wells

  Net Oil/Condensate* and Gas Wells Drilled Annually in 2011

+----------------------------------+------+-----------+---+-----------+
|                                  |      | Net       |   | Net dry   |
|                                  |      | P         |   |           |
|                                  |      | roductive |   | well      |
|                                  |      | wells     |   | drilled   |
|                                  |      | drilled   |   |           |
+----------------------------------+------+-----------+---+-----------+
| Exploratory                      |      |           |   |           |
+----------------------------------+------+-----------+---+-----------+
| Thailand                         |      | 5.3       |   | 1         |
+----------------------------------+------+-----------+---+-----------+
| Foreign                          |      |           |   |           |
+----------------------------------+------+-----------+---+-----------+
| Southeast Asia                   |      | 4         |   | 1.8       |
+----------------------------------+------+-----------+---+-----------+
| Australia                        |      | 0.8       |   | 2.1       |
+----------------------------------+------+-----------+---+-----------+
| Middle East and Others           |      | 30        |   | 18        |
+----------------------------------+------+-----------+---+-----------+
| Total                            |      | 40.1      |   | 22.9      |
+----------------------------------+------+-----------+---+-----------+

Development

+----------------------------------+------+-----------+---+-----------+
| Thailand                         |      | 141.6     |   | 3.9       |
+----------------------------------+------+-----------+---+-----------+
| Foreign                          |      |           |   |           |
+----------------------------------+------+-----------+---+-----------+
| Southeast Asia                   |      | 1.4       |   | -         |
+----------------------------------+------+-----------+---+-----------+
| Australia                        |      | 1         |   | -         |
+----------------------------------+------+-----------+---+-----------+
| Middle East and Others           |      | 5         |   | -         |
+----------------------------------+------+-----------+---+-----------+
| Total                            |      | 149       |   | 3.9       |
+----------------------------------+------+-----------+---+-----------+

* include Bitumen Wells

Gross wells include the total number of wells in which the company has
an interest excluding utility wells.

Net wells are the sum of the company’s fractional interests in gross
wells.

Quarterly Information in 2011 and 2010 (unaudited) for the consolidated
financial statement are as follows:

(Unit: US Dollar)

  ---------------------------- -- --------------- -- --------------- -- --------------- -- ---------------
  Year 2011                       4thQ               3rdQ               2ndQ               1stQ

  Revenues                                                                                 

  Sales                           1,440,651,768      1,373,546,481      1,420,253,743      1,205,269,909

  Revenue from pipeline           31,033,243         34,413,783         32,591,372         26,032,563
  transportation                                                                           

  Other revenues                                                                           

  Gain on foreign exchange        49,780,106         -                  3,467,412          62,778,540

  Interest income                 6,168,391          4,301,144          2,780,461          2,988,758

  Other revenues                  53,905,990         9,838,249          28,208,434         13,108,003

  Total Revenues                  1,581,539,498      1,422,099,657      1,487,301,422      1,310,177,773

  Expenses                                                                                 

  Operating expenses              177,925,911        178,654,705        148,754,325        120,061,022

  Exploration expenses            27,071,538         51,237,763         76,035,541         62,545,119

  Administrative expenses         89,070,143         49,105,660         58,828,262         60,404,469

  Petroleum royalties and         167,633,500        163,396,751        171,627,884        142,810,043
  remuneration                                                                             

  Depreciation, depletion and     267,591,706        272,365,810        279,413,569        297,975,028
  amortization                                                                             

  Other expenses                                                                           

  Loss on foreign exchange        -                  180,912,028        -                  -

  Loss from Montara incident      4,297,651          1,033,629          -                  -

  Loss from derivative            3,623,747          2,019,730          2,353,816          3,059,338
  financial instruments                                                                    

  Management's remuneration       2,156,086          852,820            676,927            884,796

  Other expenses                  -                  -                  -                  -

  Finance costs                   35,167,465         32,830,745         31,604,288         23,954,550

  Total Expenses                  774,537,747        932,409,641        769,294,612        711,694,365

  Share of gain (loss) from       1,224,201          (853)              553,534            653,034
  associates                                                                               

  Income before income taxes      808,225,952        489,689,163        718,560,344        599,136,442

  Income taxes                    (319,093,659)      (240,100,824)      (348,521,606)      (239,648,726)

  Income for the year             489,132,293        249,588,339        370,038,738        359,487,716

  Earnings per share                                                                       

  Basic earnings per share        0.15               0.08               0.11               0.11

  Diluted earnings per share      0.15               0.08               0.11               0.11
  ---------------------------- -- --------------- -- --------------- -- --------------- -- ---------------

(Unit: US Dollar)

  ----------------------------- -- --------------- -- --------------- -- --------------- -- ---------------
  Year 2010                        4thQ               3rdQ               2ndQ               1stQ

  Revenues                                                                                  

  Sales                            1,155,652,954      1,086,992,392      1,107,749,435      979,239,865

  Revenue from pipeline            29,779,705         28,859,314         30,363,404         21,833,685
  transportation                                                                            

  Other revenues                                                                            

  Gain on foreign exchange         10,236,657         -                  12,097,006         -

  Interest income                  3,143,486          2,835,531          2,558,793          3,257,389

  Gain on financial derivatives    -                  -                  2,347,005          -

  Other revenues                   9,523,034          51,113,966         15,232,525         3,635,610

  Total Revenues                   1,208,335,836      1,169,801,203      1,170,348,168      1,007,966,549

  Expenses                                                                                  

  Operating expenses               96,918,633         131,882,479        141,246,933        88,341,620

  Exploration expenses             19,280,288         39,519,877         12,899,427         15,224,870

  Administrative expenses          71,556,330         44,846,953         36,041,742         40,019,968

  Petroleum royalties and          144,083,990        133,958,144        124,812,718        122,474,002
  remuneration                                                                              

  Depreciation, depletion and      231,985,633        279,570,354        265,713,435        240,072,240
  amortization                                                                              

  Other expenses                                                                            

  Loss on foreign exchange         -                  87,170,847         -                  21,016,941

  Loss from Montara incident       5,903,700          8,506,400          -                  -

  Loss from derivative             1,116,867          1,920,888          -                  2,777,783
  financial instruments                                                                     

  Management's remuneration        2,558,591          1,051,341          1,049,548          1,255,889

  Other expenses                   -                  47,739,610         -                  -

  Finance costs                    31,958,610         27,920,498         22,318,145         22,348,322

  Total Expenses                   605,362,642        804,087,391        604,081,948        553,531,635

  Share of gain (loss) from        690,255            (195,503)          (159,688)          (1,682,598)
  associates                                                                                

  Income before income taxes       603,663,449        365,518,309        566,106,532        452,752,316

  Income taxes                     (221,844,421)      (29,721,072)       (214,626,840)      (141,370,365)

  Income for the year              381,819,028        335,797,237        351,479,692        311,381,951

  Earnings per share                                                                        

  Basic earnings per share         0.12               0.10               0.11               0.09

  Diluted earnings per share       0.12               0.10               0.11               0.09
  ----------------------------- -- --------------- -- --------------- -- --------------- -- ---------------

Five-year petroleum sales volume and unit price summary

[TABLE]