TIDMENDV 
 
Endeavour Announces Record Reserve Growth in 2009 
 
HOUSTON, Feb. 16 -- Endeavour International Corporation (NYSE Amex: END) (LSE: 
ENDV) today announced a 49 percent increase in proved and probable reserves as 
of December 31, 2009 resulting in a record reserve replacement rate of 980 
percent of 2009 production, based on 2P reserves. 
 
"This increase is attributable to the success of our North Sea exploration and 
appraisal programs and demonstrates our ability to grow the company through the 
drill bit," said William L. Transier, chairman, chief executive officer and 
president.  "We now have four field developments underway in the United Kingdom. 
These longer-cycle projects complement our expanded U.S. onshore initiative that 
we expect to contribute significantly to reserve growth in 2010." 
 
Proved and probable reserves at year-end 2009 increased to 38.9 million barrels of 
oil equivalent (mmboe) compared to 26.1 mmboe a year ago.  Extensions, 
discoveries and upward revisions to prior estimates and purchases added 13.7 
mmboe during 2009. Production for the year was 1.4 mmboe. 
 
The upward revisions in 2P reserves were a result of the drilling of two wells in 
Cygnus Fault Blocks 2b and 3, the 2007 Bacchus discovery maturing to 
development status and better-than-expected performance from several producing 
assets. 
 
 
 
 
 
 
                      Net Reserves at December 31, 
                      ---------------------------- 
                                                  2009 
                                                  ---- 
Audited by: Netherland, Sewell 
 and Associates, Inc.            Oil       NGL        Gas    Equivalents 
                                (mbbl)    (mbbl)     (mmcf)     (mboe) 
                                ------    ------     ------     ------ 
Proved Developed 
  Producing                     1,212        26       4,458       1,981 
  Non-Producing                   150         -       4,578         913 
Proved Undeveloped              1,973         5      80,064      15,322 
                                -----       ---      ------      ------ 
  Proved (1P)                   3,335        31      89,100      18,216 
Probable                        7,352        20      79,919      20,692 
                                -----       ---      ------      ------ 
  Proved + Probable 
   (2P)                        10,687        51     169,019      38,908 
Possible                        7,859        34      89,478      22,806 
                                -----       ---      ------      ------ 
  Proved + Probable + 
   Possible (3P)               18,546        85     258,497      61,714 
 
                                               2008* 
                                               ----- 
Prepared by: Netherland, 
 Sewell and Associates, Inc.     Oil       NGL        Gas    Equivalents 
                                (mbbl)    (mbbl)     (mmcf)     (mboe) 
                                ------    ------     ------     ------ 
Proved Developed 
   Producing                      989         -       6,657       2,099 
   Non-Producing                  466        19         338         542 
Proved Undeveloped                675         -      20,825       4,146 
                                  ---       ---      ------       ----- 
   Proved (1P)                  2,130        19      27,820       6,787 
Probable                        5,777         7      81,375      19,347 
                                -----       ---      ------      ------ 
   Proved + Probable 
    (2P)                        7,907        26     109,195      26,134 
Possible                       11,034         6     107,090      28,889 
                               ------       ---     -------      ------ 
   Proved + Probable + 
    Possible (3P)              18,941        32     216,285      55,023 
 
*Reserve information has been restated for the disposition of 
 its Norwegian operations in May 2009 (5.6 mmboe). 
 
 
Endeavour International Corporation is an international oil and gas exploration 
and production company focused on the acquisition, exploration and development 
of energy reserves in the North Sea and United States.  For more 
information, visit http://www.endeavourcorp.com. 
 
Source: Netherland, Sewell and Associates, Inc 
 
Certain statements in this news release should be regarded as "forward-looking" 
statements within the meaning of the securities laws. These statements speak 
only of as of the date made. Such statements are subject to assumptions, risk 
and uncertainty. Actual results or events may vary materially. 
 
As of January 1, 2010, the Securities and Exchange Commission (SEC) changed its 
rules to permit oil and gas companies, in their filings with the SEC, to 
disclose not only proved reserves, but also probable reserves and possible 
reserves.  Proved oil and gas reserves are those quantities of oil and gas, 
which, by analysis of geoscience and engineering data, can be estimated with 
reasonable certainty to be economically producible - from a given date forward, 
from known reservoirs, and under existing economic conditions, operating 
methods, and government regulations - prior to the time at which contracts 
providing the right to operate expire.  Probable reserves include those 
additional reserves that a company believes are as likely as not to be recovered 
and possible reserves include those additional reserves that are less certain to 
be recovered than probable reserves.  We use may use certain terms in 
our news releases, such as "reserve potential," that the SEC's guidelines 
strictly prohibit us from including in filings with the SEC. In addition, we do 
not represent that the probable or possible reserves described herein meet the 
recoverability thresholds established by the SEC in its new definitions. 
Investors are urged to also consider closely the disclosure in our filings with 
the SEC, available from our website at www.endeavourcorp.com.  Endeavour is also 
subject to the requirements of the London Stock Exchange and considers the 
disclosures in this release to be appropriate and/or required under the 
guidelines of that exchange. 
 
SOURCE  Endeavour International Corporation 
 
 
CONTACT:  Investor Relations, Mike Kirksey of Endeavour, +44 (0) 207 451 2364, 
or +1-713-307-8788; or United Kingdom Broker, Jeffrey Auld of Canaccord Adams, 
+44 (0) 207 050 6500, for Endeavour; or UK Media, Philip Dennis, +44 (0) 207 743 
6363, or Henry Lerwill, +44 (0) 203 178 6242, both of Pelham Public Relations, 
for Endeavour 
 
 
 
 
 
 
END 
 

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