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Exhibit 15.2

Gaffney,

Cline &

Associates

THIRD PARTY REPORT

RESERVES ESTIMATION AND EVALUATION OF

(CHAD AND ALGERIA)

AS OF 31stDECEMBER, 2012

Prepared for

PETROCHINA COMPANY LIMITED

MARCH, 2013

CONFIDENTIAL

This document contains proprietary and confidential information which may not, without the express written permission of Gaffney, Cline & Associates, be released to any third party in any form,
copied in any way or reproduced, nor utilized for any purpose except that for which it is intended, and must be returned upon request.

www.gaffney-cline.com



|           |  |            |  |                        
|---------- |  | ---------- |  | -----------------------
|PetroChina |  | Copy No. 1 |  | PS-12-2130 & PS-12-2133



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Gaffney,

Cline &

Associates



|             |  |                             |   |          |   | 
|------------ |  | --------------------------- | - | -------- | - | 
|             |  |                             |   | Page No. |  
|INTRODUCTION |  |                             |   |         
|METHODOLOGY  |  |                             | 2 |         
|1.           |  | RESULTS SUMMARY             |   |          | 3 | 
|             |  | 1.1    Net Reserves         |   |          | 3 | 
|             |  | 1.2    Gross Volumes        |   |          | 3 | 
|             |  | 1.3    Net Present Values   |   |          | 4 | 
|             |  | 1.4    Sensitivity Analysis |   |          | 4 | 
|2.           |  | BASIS OF OPINION            |   |          | 5 | 
|             | 
|APPENDIX     |  |                             |   |         
|I.           |  | Glossary                    |   |          |   | 



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Gaffney,

Cline &

Associates

Gaffney, Cline & Associates

(Consultants) Pte. Ltd.

80 Anson Road

#31-01C Fuji Xerox Towers

Singapore 079907

Telephone: +65 6225 6951

www.gaffney-cline.com



|                                          |  |                
|----------------------------------------- |  | ---------------
|DSR/dh/L0110/2013/PS-12-2130 & PS-12-2133 |  | 11thMarch, 2013

PetroChina Company Limited

9 Dongzhimen North Street, Dongcheng District

Beijing 100007

China

Dear Gentlemen,

THIRD PARTY REPORT

RESERVES ESTIMATION AND VALUATION OF

(CHAD AND ALGERIA)

AS OF 31stDECEMBER, 2012

INTRODUCTION

Gaffney, Cline & Associates (GCA) was requested by China National Oil and Gas Exploration and Development Corporation International Holding Ltd. (CNODCI), to conduct
reserves estimation and evaluation (as of
31stDecember, 2012) of selected petroleum assets in
Algeria, Chad, and Venezuela, in which CNODCI has current interests.

The SEC Executive and SEC Technical
Reports were submitted to CNODCI in January and March, 2013, respectively. The report is required for CNODCI internal management reporting purposes and is limited to Proved Reserves only. The report references are as follows:



|                      |  |                                                       |  |                                                   
|--------------------- |  | ----------------------------------------------------- |  | --------------------------------------------------
|Asset                 |  | SEC Executive Report                                  |  | SEC Technical Report                              
|Chad                  |  | DSR/dh/L0024/2013/PS-12-2130 dated 7thFebruary, 2013  |  | DSR/dh/L0039/2013/PS-12-2130 dated 8thMarch, 2013 
|                      |  |                                                      
|Algeria and Venezuela |  | DSR/jbi/L0029/2013/PS-12-2133 dated
7thFebruary, 2013 |  | DSR/jbi/L0044/2013/PS-12-2133 dated
8thMarch, 2013

Recently, CNODCI requested GCA to prepare a Third Party Report
intended to be submitted to PetroChina Company Limited (PetroChina). This report is to summarize the results of reserves estimation and valuation as of 31stDecember, 2012 as mentioned above of only selected petroleum assets. The selected petroleum assets determined by
CNODCI are in Chad and Algeria.



UEN:
198701453N



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METHODOLOGY

In carrying out the review, GCA relied upon information and data provided through CNODCI, which comprised: basic
engineering data; geoscience information and engineering interpretations associated with such data; other technical reports; costs and commercial data; and development plans. The available data and interpretations were reviewed for reasonableness
and the latter adjusted where appropriate.

The results presented in this report are
based upon information and data made available to GCA on or before 20thDecember, 2012. The Reserve Estimates, forward production estimates and Net Present Value (NPV) computations as presented herein are based upon these data and represent GCAs
opinion as of 31stDecember, 2012.

It is GCAs opinion that the estimates of oil and gas reserve volumes as of 31stDecember, 2012, presented in this document are, in aggregate,
reasonable and were prepared in accordance with the Final Rule of Modernization of Oil and Gas Reporting (17 CFR Parts 210, 211, 229 and 249) published by the US Securities and Exchange Commission (SEC) on 14thJanuary, 2009 on Federal Register/ Vol. 74, No. 9 (see web
version: http://www.sec.gov/rules/final/2010/33-8995fr.pdf). The definitions are applicable to the Proved reserve categories and sub-classifications.

Economic models were constructed based on terms of the applicable petroleum contracts as provided by CNODCI, in order to calculate CNODCIs net revenue interest Proved reserves. As of
31st December, 2012, all Proved SEC reserves were allocated up to the end of the license contract period only.

As per SEC guidelines, the oil prices which were used in the evaluation are the unweighted 12-month arithmetic averages of the first-day-of-the month price for each month within the 12-month period
(January to December, 2012) prior to the end of reporting period, unless prescribed by contract. Those prices were held constant throughout the evaluation period except where alternate prices are prescribed by contract. The report also summarises
the sensitivity results in which oil prices were escalated throughout the evaluation period except as prescribed by contract. The historical 12-month oil prices were supplied by CNODCI.

Future capital costs were derived from development program forecasts prepared by CNODCI for each production unit and
corresponding recent historical unit cost data. The recent historical cost data for each relevant production unit were utilised to determine current operating cost conditions. These costs were not escalated throughout the evaluation period in the
Base Case; however the future capital and operating costs were escalated in the sensitivity analysis.

CNODCIs net reserve volumes are derived by converting calculated net revenues accruing to CNODCI under the terms of
the relevant petroleum contract into equivalent barrels of oil utilising the average 2012 oil pricing explained above. The CNODCI net revenue interest volumes reported in this document represent those amounts that are determined to be attributable
to CNODCIs net economic interest after the deduction of amounts attributable to third parties (government and other working interest partners).

NPV computations were also undertaken and derived using cost and production profiles input to the
various economic models established for the different petroleum contracts. These NPVs represent future net revenue, after taxes, attributable to the interests of CNODCI, discounted over the economic life of the project at a specified discount rate
to a present value as of 31stDecember, 2012. NPV
results are also presented for the sensitivity analysis using the escalated oil and gas prices and Capital and Operating Costs. Unless otherwise stated, no opening tax positions were considered.

A glossary of abbreviations and key industry standard terms, some or all of which may be used in this report, is attached
as Appendix I.



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|1. | RESULTS SUMMARY
|-- | ---------------



|1.1 | Net Reserves
|--- | ------------

The following tables present the net entitlement Proved Developed, Proved Undeveloped and Total Proved oil reserves attributable to CNODCIs working interests (WI) estimated in accordance with SEC
guidelines.

As required under SEC guidelines, these estimates were prepared under the prevailing fiscal terms
and exclude any government share. The economic cut offs were applied using costs and prices which are unescalated throughout the period of calculation and constant prices, except where alternate prices are prescribed by contract. The oil prices used
for these computations were the un-weighted 12-month arithmetic average of the first-day-of-the month price for each month within the 12-month period (January to December, 2012).

NET ENTITLEMENT PROVED OIL RESERVES

AS OF 31stDECEMBER, 2012



|                |  |                         |        |  |                          |  |        |                     |  |  |        | 
|--------------- |  | ----------------------- | ------ |  | ------------------------ |  | ------ | ------------------- |  |  | ------ | 
|Country         |  | Proved 
Developed(Mstb) |        |  | ProvedUndeveloped(Mstb
) |  |        | Total Proved(Mstb
) | 
|Algeria  Adrar |  |                         | 5,546  |  |                          |  | 6,050  |                     |  |  | 11,596 | 
|Chad  Permit H |  |                         | 25,765 |  |                          |  | 50,068 |                     |  |  | 75,833 | 
|                |  |                         |        |  |                          |  |        |                     |  |  |        | 
|TOTAL CNODCI    |  |                         | 31,311 |  |                          |  | 56,118 |                     |  |  | 87,429 | 
|                |  |                         |        |  |                          |  |        |                     |  |  |        | 

Notes:

|1. | The net entitlement in Adrar is attributable to CNODCIs 49% net interest.
|-- | --------------------------------------------------------------------------

|2. | CNODCI holds 100% WI in Permit H. Royalty in Permit H is paid in kind; therefore, it is deducted from the Gross Reserves volumes.
|-- | ---------------------------------------------------------------------------------------------------------------------------------

|3. | Both assets produce oil only. Gas has been discovered in some structures in Permit H, but there is no market as yet.
|-- | --------------------------------------------------------------------------------------------------------------------



|1.2 | Gross Volumes
|--- | -------------

Gross production volumes are presented for reference information only. They represent a 100% working interest in commercially recoverable volumes, i.e. after economic cutoffs have been applied. Gross
volumes include volumes attributable to third parties, government and other working interest partners.

GROSS PROVED OIL
RESERVES

AS OF 31stDECEMBER, 2012



|                |  |                         |        |  |                          |  |        |                     |  |  |         | 
|--------------- |  | ----------------------- | ------ |  | ------------------------ |  | ------ | ------------------- |  |  | ------- | 
|Country         |  | Proved 
Developed(Mstb) |        |  | ProvedUndeveloped(Mstb
) |  |        | Total Proved(Mstb
) | 
|Algeria  Adrar |  |                         | 11,326 |  |                          |  | 12,356 |                     |  |  | 23,682  | 
|Chad  Permit H |  |                         | 29,446 |  |                          |  | 57,220 |                     |  |  | 86,666  | 
|                |  |                         |        |  |                          |  |        |                     |  |  |         | 
|TOTAL CNODCI    |  |                         | 40,772 |  |                          |  | 69,576 |                     |  |  | 110,348 | 
|                |  |                         |        |  |                          |  |        |                     |  |  |         | 



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|1.3 | Net Present Values
|--- | ------------------

The NPVs as of 31stDecember, 2012 of estimated cash flows discounted at 10%, after taxes, attributable to CNODCIs working
interest in the projects identified above (excluding any balance sheet adjustments or financing costs), are summarised below.

NET PRESENT VALUES ATTRIBUTABLE TO CNODCI

AS OF 31stDECEMBER, 2012

DISCOUNT RATE 10%



|                |  |                            |     |  |                             |  |     |                        |  |  |       | 
|--------------- |  | -------------------------- | --- |  | --------------------------- |  | --- | ---------------------- |  |  | ----- | 
|Country         |  | Proved Developed(U.S.$
MM) |     |  | ProvedUndeveloped(U.S.$
MM) |  |     | Total Proved(U.S.$
MM) | 
|Algeria  Adrar |  |                            | 71  |  |                             |  | 15  |                        |  |  | 86    | 
|Chad  Permit H |  |                            | 573 |  |                             |  | 440 |                        |  |  | 1,013 | 
|                |  |                            |     |  |                             |  |     |                        |  |  |       | 
|TOTAL CNODCI    |  |                            | 644 |  |                             |  | 455 |                        |  |  | 1,099 | 
|                |  |                            |     |  |                             |  |     |                        |  |  |       | 

Notes:

|1. | NPVs in Adrar and Permit H represent CNODCIs 49% and 100% WI, respectively.
|-- | ----------------------------------------------------------------------------

|2. | No opening tax positions or un-recovered balances are available for Adrar.
|-- | --------------------------------------------------------------------------

|3. | The average Adrar net-back price received in year 2012 per Contract is US$21.80/bbl.
|-- | ------------------------------------------------------------------------------------

|4. | Permit H domestic crude price per Contract is US$68.00/bbl. The average exported crude price is US$91.21/bbl.
|-- | -------------------------------------------------------------------------------------------------------------

|5. | Loss carried-forward in Permit H based on the CNODCI information as of 31 December, 2012 is US$427.62 MM.
|-- | ---------------------------------------------------------------------------------------------------------

|6. | Mid-year discounted cash flow.
|-- | ------------------------------

The NPVs were calculated on the basis of SEC guidelines under which the economic cut-offs were applied using unescalated costs and constant prices. The crude oil prices used for these computations were
the un-weighted 12-month arithmetic average of the first-day-of-the month price for each month within the 12-month period (January to December, 2012) except in instances where alternate prices are prescribed by contract.



|1.4 | Sensitivity Analysis
|--- | --------------------

Sensitivity analysis has been carried out on the oil prices. In the sensitivity analysis, a future crude oil price scenario was adopted and oil prices were also escalated throughout the evaluation period,
except where prescribed by contract. In addition to the escalated oil prices, CAPEX and OPEX were also escalated. The sensitivity results are summarised in the following table.

NET PRESENT VALUES ATTRIBUTABLE TO CNODCI

SENSITIVITY RESULTS

AS OF 31stDECEMBER, 2012

DISCOUNT RATE 10%



|                |  |                            |     |  |                             |  |     |                        |  |  |       | 
|--------------- |  | -------------------------- | --- |  | --------------------------- |  | --- | ---------------------- |  |  | ----- | 
|Country         |  | Proved Developed(U.S.$
MM) |     |  | ProvedUndeveloped(U.S.$
MM) |  |     | Total Proved(U.S.$
MM) | 
|Algeria  Adrar |  |                            | 73  |  |                             |  | 19  |                        |  |  | 92    | 
|Chad  Permit H |  |                            | 561 |  |                             |  | 365 |                        |  |  | 926   | 
|                |  |                            |     |  |                             |  |     |                        |  |  |       | 
|TOTAL CNODCI    |  |                            | 634 |  |                             |  | 384 |                        |  |  | 1,018 | 
|                |  |                            |     |  |                             |  |     |                        |  |  |       | 



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Notes:

|1. | NPVs in Adrar and Permit H represent CNODCIs 49% and 100% WI, respectively.
|-- | ----------------------------------------------------------------------------

|2. | No opening tax positions or un-recovered balances are available for Adrar.
|-- | --------------------------------------------------------------------------

|3. | Loss carried-forward in Permit H based on the CNODCI information as of 31stDecember, 2012 is US$427.62 MM.
|-- | ----------------------------------------------------------------------------------------------------------

|4. | Mid-year discounted cash flow.
|-- | ------------------------------



|2. | BASIS OF OPINION
|-- | ----------------

This report has been compiled under the supervision of Mr. Rawdon J.H. Seager and Mr. David S. Ahye. Mr. Rawdon J.H. Seager is a Technical Director, who is based in Houston, USA.
Mr. Ahye is a Principal Advisor for the Asia Pacific region, based in Singapore. Both Mr. Seager and Mr. Ahye have over 30 years experience in the petroleum industry and have managed numerous reserves audits. Mr. Seager has
a Masters Degree in Petroleum Engineering and is a Chartered Petroleum Engineer in the U.K., and is registered as a European Engineer with FEANI. Mr. Ahye holds a Bachelors Degree (Honours) in Chemical Engineering.

This assessment was conducted within the context of GCAs understanding of the effects of petroleum legislation,
taxation and other regulations that currently pertain to the various properties. However, GCA is not in a position to attest to the property title, financial interest relationships or encumbrances thereon for any part of the properties reviewed.

It must be clearly understood that any assessment of resources volumes, particularly involving continuing
field development, will be subject to significant variations over short periods of time as new information becomes available and perceptions change. Not only are such estimates of Reserves based on that information which is currently available, but
such estimates are also subject to uncertainties inherent in the application of judgmental factors in interpreting such information. Those quantities that might actually be recovered may differ significantly from the estimates presented herein.

It should be clearly noted that the Net Present Values (NPVs) of future revenue potential of a petroleum
property, such as those discussed in this report, do not represent a GCA opinion as to the market value of that property, nor any interest in it. In assessing a likely market value, it would be necessary to take into account a number of additional
factors including: reserves risk (i.e. that Proved Reserves may not be realised within the anticipated timeframe for their exploitation); perceptions of economic and sovereign risk; potential upside, such as in this case exploitation of reserves
beyond the Proved level; other benefits, encumbrances or charges that may pertain to a particular interest; and the competitive state of the market at the time. GCA has explicitly not taken such factors into account in deriving the reference NPVs
presented herein.

GCA is not aware of any potential changes in regulations applicable to these fields that
could affect the ability of CNODCI to produce the estimated reserves.

GCAs audit involved reviewing
pertinent facts, interpretations and assumptions made by CNODCI or others in preparing estimates of reserves. GCA carried out procedures necessary to enable it to render an opinion on the appropriateness of the methodologies employed, adequacy and
quality of the data relied upon, the depth and thoroughness of the reserves estimation process, the classification of reserves appropriate to the relevant definitions used and the reasonableness of the estimated reserves.

GCA acted as independent reserve auditors. The firms employees have no direct or indirect interest holding in
either CNODCI/PetroChina or its affiliated companies. GCAs remuneration was not in any way contingent upon reported reserve estimates.



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This report has been prepared for
CNODCI/PetroChina and should not be used for purposes other than those for which it is intended. This report should not be reproduced, either in whole or part, without the written permission of GCA. CNODCI/PetroChina will obtain GCAs prior
written or email approval for the use with third parties and context of the use with third parties of any results, statements or opinions expressed by GCA to CNODCI, which are attributed to GCA. Such requirement of approval shall include, but not be
confined to, statements or references in documents of a public or semi-public nature such as loan agreements, prospectuses, reserve statements, websites, press releases, etc.

Yours faithfully,

GAFFNEY, CLINE & ASSOCIATES (CONSULTANTS) PTE LTD



Rawdon J. H. Seager

Technical Director



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APPENDIX I

GLOSSARY



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List of Standard Oil Industry Terms and Abbreviations



|              |  |                                                 |  |       |  |                                                               
|------------- |  | ----------------------------------------------- |  | ----- |  | --------------------------------------------------------------
|ABEX          |  | Abandonment Expenditure                         |  | g/cc  |  | grams per cubic centimetre                                    
|ACQ           |  | Annual Contract Quantity                        |  | Gal   |  | gallon                                                        
|°API          |  | Degrees API (American Petroleum Institute)      |  | gal/d |  | gallons per day                                               
|AAPG          |  | American Association of Petroleum Geologists    |  | G&A   |  | General and Administrative costs                              
|AVO           |  | Amplitude versus Offset                         |  | GBP   |  | Pounds Sterling                                               
|A$            |  | Australian Dollars                              |  | GDT   |  | Gas Down to                                                   
|B             |  | Billion (109)                                   |  | GIIP  |  | Gas initially in place                                        
|Bbl           |  | Barrels                                         |  | GJ    |  | Gigajoules (one billion Joules)                               
|/Bbl          |  | per barrel                                      |  | GOR   |  | Gas Oil Ratio                                                 
|BBbl          |  | Billion Barrels                                 |  | GTL   |  | Gas to Liquids                                                
|BHA           |  | Bottom Hole Assembly                            |  | GWC   |  | Gas water contact                                             
|BHC           |  | Bottom Hole Compensated                         |  | HDT   |  | Hydrocarbons Down to                                          
|Bscf or Bcf   |  | Billion standard cubic feet                     |  | HSE   |  | Health, Safety and Environment                                
|Bscfd or Bcfd |  | Billion standard cubic feet per day             |  | HSFO  |  | High Sulphur Fuel Oil                                         
|Bm3           |  | Billion cubic metres                            |  | HUT   |  | Hydrocarbons up to                                            
|Bcpd          |  | Barrels of condensate per day                   |  | H2S   |  | Hydrogen Sulphide                                             
|BHP           |  | Bottom Hole Pressure                            |  | IOR   |  | Improved Oil Recovery                                         
|Blpd          |  | Barrels of liquid per day                       |  | IPP   |  | Independent Power Producer                                    
|Bpd           |  | Barrels per day                                 |  | IRR   |  | Internal Rate of Return                                       
|Boe           |  | Barrels of oil equivalent @ xxx mcf/Bbl         |  | J     |  | Joule (Metric measurement of energy) 1 kilojoule = 0.9478 BTU)
|boepd         |  | Barrels of oil equivalent per day @ xxx mcf/Bbl |  | k     |  | Permeability                                                  
|BOP           |  | Blow Out Preventer                              |  | KB    |  | Kelly Bushing                                                 
|Bopd          |  | Barrels oil per day                             |  | KJ    |  | Kilojoules (one Thousand Joules)                              
|Bwpd          |  | Barrels of water per day                        |  | kl    |  | Kilolitres                                                    
|BS&W          |  | Bottom sediment and water                       |  | km    |  | Kilometres                                                    
|BTU           |  | British Thermal Units                           |  | km2   |  | Square kilometres                                             
|Bwpd          |  | Barrels water per day                           |  | kPa   |  | Thousands of Pascals (measurement of pressure)                
|CBM           |  | Coal Bed Methane                                |  | KW    |  | Kilowatt                                                      
|CO2           |  | Carbon Dioxide                                  |  | KWh   |  | Kilowatt hour                                                 
|CAPEX         |  | Capital Expenditure                             |  | LKG   |  | Lowest Known Gas                                              
|CCGT          |  | Combined Cycle Gas Turbine                      |  | LKH   |  | Lowest Known Hydrocarbons                                     
|cm            |  | centimetres                                     |  | LKO   |  | Lowest Known Oil                                              
|CMM           |  | Coal Mine Methane                               |  | LNG   |  | Liquefied Natural Gas                                         
|CNG           |  | Compressed Natural Gas                          |  | LoF   |  | Life of Field                                                 
|Cp            |  | Centipoise (a measure of viscosity)             |  | LPG   |  | Liquefied Petroleum Gas                                       
|CSG           |  | Coal Seam Gas                                   |  | LTI   |  | Lost Time Injury                                              
|CT            |  | Corporation Tax                                 |  | LWD   |  | Logging while drilling                                        
|DCQ           |  | Daily Contract Quantity                         |  | m     |  | Metres                                                        
|Deg C         |  | Degrees Celsius                                 |  | M     |  | Thousand                                                      
|Deg F         |  | Degrees Fahrenheit                              |  | m3    |  | Cubic metres                                                  



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|       |  |                                                              |  |              |  |                                                                   
|------ |  | ------------------------------------------------------------ |  | ------------ |  | ------------------------------------------------------------------
|DHI    |  | Direct Hydrocarbon Indicator                                 |  | Mcf orMscf   |  | Thousand standard cubic feet                                      
|DST    |  | Drill Stem Test                                              |  | MCM          |  | Management Committee Meeting                                      
|DWT    |  | Dead-weight ton                                              |  | MMcf orMMscf |  | Million standard cubic feet                                       
|E&A    |  | Exploration & Appraisal                                      |  | m3d          |  | Cubic metres per day                                              
|E&P    |  | Exploration and Production                                   |  | mD           |  | Measure of Permeability in millidarcies                           
|EBIT   |  | Earnings before Interest and Tax                             |  | MD           |  | Measured Depth                                                    
|EBITDA |  | Earnings before interest, tax, depreciation and amortisation |  | MDT          |  | Modular Dynamic Tester                                            
|EI     |  | Entitlement Interest                                         |  | Mean         |  | Arithmetic average of a set of numbers                            
|EIA    |  | Environmental Impact Assessment                              |  | Median       |  | Middle value in a set of values                                   
|EMV    |  | Expected Monetary Value                                      |  | MFT          |  | Multi Formation Tester                                            
|EOR    |  | Enhanced Oil Recovery                                        |  | mg/l         |  | milligrams per litre                                              
|EUR    |  | Estimated Ultimate Recovery                                  |  | MJ           |  | Megajoules (One Million Joules)                                   
|FEED   |  | Front End Engineering and Design                             |  | Mm3          |  | Thousand Cubic metres                                             
|FPSO   |  | Floating Production, Storage and Offloading                  |  | Mm3d         |  | Thousand Cubic metres per day                                     
|FSO    |  | Floating Storage and Offloading                              |  | MM           |  | Million                                                           
|Ft     |  | Foot/feet                                                    |  | MMBbl        |  | Millions of barrels                                               
|Fx     |  | Foreign Exchange Rate                                        |  | MMBTU        |  | Millions of British Thermal Units                                 
|G      |  | gram                                                         |  | Mode         |  | Value that exists most frequently in a set of values = most likely
|Mscfd  |  | Thousand standard cubic feet per day                         |  | scf/ton      |  | Standard cubic foot per ton                                       
|MMscfd |  | Million standard cubic feet per day                          |  | SL           |  | Straight line (for depreciation)                                  
|MW     |  | Megawatt                                                     |  | So           |  | Oil Saturation                                                    
|MWD    |  | Measuring While Drilling                                     |  | SPE          |  | Society of Petroleum Engineers                                    
|MWh    |  | Megawatt hour                                                |  | SPEE         |  | Society of Petroleum Evaluation Engineers                         
|mya    |  | Million years ago                                            |  | Ss           |  | Subsea                                                            
|NGL    |  | Natural Gas Liquids                                          |  | Stb          |  | Stock tank barrel                                                 
|N2     |  | Nitrogen                                                     |  | STOIIP       |  | Stock tank oil initially in place                                 
|NPV    |  | Net Present Value                                            |  | Sw           |  | Water Saturation                                                  
|OBM    |  | Oil Based Mud                                                |  | T            |  | Tonnes                                                            
|OCM    |  | Operating Committee Meeting                                  |  | TD           |  | Total Depth                                                       
|ODT    |  | Oil down to                                                  |  | Te           |  | Tonnes equivalent                                                 
|OPEX   |  | Operating Expenditure                                        |  | THP          |  | Tubing Head Pressure                                              
|OWC    |  | Oil Water Contact                                            |  | TJ           |  | Terajoules (1012Joules)                                           
|p.a.   |  | Per annum                                                    |  | Tscf orTcf   |  | Trillion standard cubic feet                                      
|Pa     |  | Pascals (metric measurement of pressure)                     |  | TCM          |  | Technical Committee Meeting                                       
|p.a.   |  | Per annum                                                    |  | TOC          |  | Total Organic Carbon                                              
|Pa     |  | Pascals (metric measurement of pressure)                     |  | TOP          |  | Take or Pay                                                       
|P&A    |  | Plugged and Abandoned                                        |  | Tpd          |  | Tonnes per day                                                    
|PDP    |  | Proved Developed Producing                                   |  | TVD          |  | True Vertical Depth                                               



AI.2



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##### Table of Contents

|                                                                          |  |                            
|------------------------------------------------------------------------- |  | ---------------------------
|DSR/dh/L0110/2013/PS-12-2130 & PS-12-2133 PetroChina (Third Party Report) |  | Gaffney, Cline & Associates



|            |  |                                 |  |       |  |                                                    
|----------- |  | ------------------------------- |  | ----- |  | ---------------------------------------------------
|PI          |  | Productivity Index              |  | TVDss |  | True Vertical Depth Subsea                         
|PJ          |  | Petajoules (1015Joules)         |  | USGS  |  | United States Geological Survey                    
|PSDM        |  | Post Stack Depth Migration      |  | US$   |  | United States Dollar                               
|Psi         |  | Pounds per square inch          |  | VSP   |  | Vertical Seismic Profiling                         
|Psia        |  | Pounds per square inch absolute |  | WC    |  | Water Cut                                          
|Psig        |  | Pounds per square inch gauge    |  | WI    |  | Working Interest                                   
|PUD         |  | Proved Undeveloped              |  | WPC   |  | World Petroleum Council                            
|PVT         |  | Pressure volume temperature     |  | WTI   |  | West Texas Intermediate                            
|P10         |  | 10% Probability                 |  | wt%   |  | Weight percent                                     
|P50         |  | 50% Probability                 |  | 1H05  |  | First half (6 months) of 2005 (example of date)    
|P90         |  | 90% Probability                 |  | 2Q06  |  | Second quarter (3 months) of 2006 (example of date)
|Rf          |  | Recovery factor                 |  | 2D    |  | Two dimensional                                    
|RFT         |  | Repeat Formation Tester         |  | 3D    |  | Three dimensional                                  
|RT          |  | Rotary Table                    |  | 4D    |  | Four dimensional                                   
|Rw          |  | Resistivity of water            |  | 1P    |  | Proved Reserves                                    
|SCAL        |  | Special core analysis           |  | 2P    |  | Proved plus Probable Reserves                      
|cf or scf   |  | Standard Cubic Feet             |  | 3P    |  | Proved plus Probable plus Possible Reserves        
|cfd or scfd |  | Standard Cubic Feet per day     |  | %     |  | Percentage                                         



AI.3