Exhibit 15.1
 DeGolyer and MacNaughton  5001 Spring Valley RoadSuite800 EastDallas, Texas75244




---



##### 



DeGolyer and MacNaughton  5001 Spring Valley RoadSuite800 East
Dallas, Texas75244




---



##### 



DeGolyer and MacNaughton
     Methodology and Procedures




---



##### 



DeGolyer and MacNaughton
      Definition of Reserves




---



##### 



DeGolyer and MacNaughton
  Proved oil and gas reserves 




---



##### 



DeGolyer and MacNaughton
     Developed oil and gas reserves




---



##### 



DeGolyer and MacNaughton
 Undeveloped reserves 
    Primary Economic Assumptions
  Oil, Condensate, and LPG Prices




---



##### 



DeGolyer and MacNaughton
  Natural Gas Prices
  Operating Expenses and Capital Costs
  Taxes




---



##### 



DeGolyer and MacNaughton
    Estimated by DeGolyer and MacNaughtonNet Proved Reserves as ofDecember 31, 2009Oil and
    
    
    
    
    
    
    NaturalCondensate
    
    
    LPG
    
    
    Gas(Mbbl)
    
    
    (Mbbl)
    
    
    (MMcf)ChinaProved Developed
    
    
    7,447,052
    
    
    
    0
    
    
    
    30,092,878Proved Undeveloped
    
    
    3,068,537
    
    
    
    0
    
    
    
    32,284,047Total Proved China
    
    
    10,515,589
    
    
    
    0
    
    
    
    62,376,925Other CountriesAsianProved Developed
    
    
    332,270
    
    
    
    8,212
    
    
    
    852,745Proved Undeveloped
    
    
    281,900
    
    
    
    305
    
    
    
    11,010North AmericanProved Developed
    
    
    417
    
    
    
    0
    
    
    
    3,158Proved Undeveloped
    
    
    0
    
    
    
    0
    
    
    
    0Total Other CountriesProved Developed
    
    
    332,687
    
    
    
    8,212
    
    
    
    855,903Proved Undeveloped
    
    
    281,900
    
    
    
    305
    
    
    
    11,010Total Proved Other Countries
    
    
    614,587
    
    
    
    8,517
    
    
    
    866,913
  1.
    
    The PetroChina net proved reserves in Other Countries include
249,474 Mbbl of oil and condensate reserves, 4,259 Mbbl of LPG reserves,
and 413,086 MMcf of natural gas reserves that are attributable to
minority interests owned by others.2.
    
    Natural gas reserves in Other Countries, except in Mongolia,
are reported as sales-gas reserves. Sales gas is defined as marketable gas
less fuel gas. Gas reserves for Mongolia are reported as marketable gas
reserves of 10,382 MMcf, which will be used for field fuel.




---



##### 



DeGolyer and MacNaughton
  Estimated by DeGolyer and MacNaughtonProved
    
    Proved
    
    TotalDeveloped
    
    Undeveloped
    
    ProvedFuture Net Revenue, MM U.S. $
    
    
    
    237,736

    
    

    
    92,193
    
    

    
    329,929Present Worth at 10 Percent, MM U.S. $
    
    

    
    130,851
    
    

    
    21,598
    
    

    
    152,449
  Estimated by DeGolyer and MacNaughtonProved
    
    
    Proved
    
    
    TotalDeveloped
    
    
    Undeveloped
    
    
    ProvedAsianFuture Net Revenue, MM U.S.$
    
    
    4,521
    
    
    
    3,638
    
    
    
    8,159Present
Worth
at 10 Percent, MM
U.S.$
    
    
    3,110
    
    
    
    1,215
    
    
    
    4,325North AmericanFuture Net Revenue, MM U.S.$
    
    
    19
    
    
    
    0
    
    
    
    19Present Worth at 10 Percent, MM U.S.$
    
    
    10
    
    
    
    0
    
    
    
    10Total Other CountriesFuture Net Revenue, MM U.S.$
    
    
    4,540
    
    
    
    3,638
    
    
    
    8,178Present Worth at 10 Percent, MM U.S.$
    
    
    3,120
    
    
    
    1,215
    
    
    
    4,335
 Extractive
Industries Oil and Gas (Topic 932): Oil and Gas Reserve Estimation and Disclosures




---



##### 



DeGolyer and MacNaughton
    Submitted,-s- DeGOLYER and MacNAUGHTON 
DeGOLYER and MacNAUGHTON
Texas Registered Engineering Firm F-716(SEAL)
    
    -s- R. M. Shuck, P.E.R. M. Shuck, P.E.
Senior Vice President
DeGolyer and MacNaughton




---



##### 



DeGolyer and MacNaughton
 CERTIFICATE of QUALIFICATION
  1.
    
    That I am a Senior Vice President with DeGolyer and MacNaughton, which company did
prepare the letter report addressed to PetroChina Company Limited dated March 20, 2010,
and that I, as Senior Vice President, was responsible for the preparation of this report.2.
    
    That I attended the University of Houston, and that I graduated with a Bachelor of
Science degree in Chemical Engineering in the year 1977; that I am a Registered
Professional Engineer in the State of Texas; that I am a member of the Society of
Petroleum Engineers; and that I have in excess of 32 years of experience in oil and gas
reservoir studies and evaluations.
  (SEAL)
    
    -s- R. M. Shuck, P.E.R. M. Shuck, P.E.
Senior Vice President 
DeGolyer and MacNaughton