TIDMENDV 
 
Endeavour Reports Fourth Cygnus Appraisal Success 
 
           Cygnus gas field reserve estimates continue to grow 
 
    HOUSTON, April 16 -- Endeavour International Corporation (NYSE Amex: END) 
(LSE: ENDV) today announced successful appraisal drilling in the western area of 
the Cygnus gas field in block 44/11a has led to increased reserves and 
prospective resource estimates and extended the field boundary to the north and 
west.  Preliminary estimates of Cygnus reserves and prospective resources could 
potentially be as high as 2 trillion cubic feet of gas based on new well 
information making Cygnus one of the largest gas fields ever discovered in the 
United Kingdom sector of the southern North Sea. 
 
    "This significant extension of the Cygnus field allows us to develop the 
area with a simplified, compressed, and lower-cost development and higher 
initial production rates that will accelerate to peak production levels more 
quickly," said William L. Transier, chairman, chief executive officer and 
president.  "This very positive increase in Cygnus reserves is another 
indication of the underlying value of our UK portfolio of assets." 
 
    The 44/11a-4 well was drilled to a depth of 12,207 feet vertical depth 
subsea, encountered a high quality, gas-saturated Leman sand reservoir 54 feet 
high to prognosis with a sand thickness of 130 feet gross and 85 feet net.  The 
well was flow tested at a rate of 28 million cubic feet of gas per day. 
 
    The discovery well and five appraisal wells drilled in the Cygnus field 
support a common field-wide gas water contact within approximately 10 feet with 
the exception of the 44/11-2 well in the extreme southwest. 
 
    When operations cease on this well, the rig will be mobilized to the 
southern part of the Cygnus field to drill a sixth well, the 44/12a-E appraisal 
well.   The Cygnus group plans to acquire a new field-wide 3-D seismic survey 
covering the expanded boundaries of the field. 
 
    Endeavour holds a 12.5 percent interest in blocks 44/11a and 12a.  License 
partners are GDF Suez E&P, the operator, and Centrica. 
 
    Endeavour International Corporation is an 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. 
 
    Certain statements in this news release should be regarded as "forward- 
looking" statements within the meaning of the securities laws. These statements 
speak only as of the date made. Such statements are subject to assumptions, risk 
and uncertainty. Actual results or events may vary materially. The estimates of 
recoverable resources per well and completed well costs included herein are 
based upon other typical results in these shale plays and may not be indicative 
of actual results. 
 
SOURCE  Endeavour International Corporation 
 
    CONTACT:  Investor Relations, Mike Kirksey, of Endeavour, +44 (0) 207-451- 
2381, +1-713-307-8788; or UK Broker, Jeffrey Auld of Canaccord Adams, +44 (0) 
207 050 6500, for Endeavour International Corporation; or UK Media, Philip 
Dennis, +44 (0) 20 7337 1516, or Henry Lerwill, +44 (0) 20 7337 1526, both of 
Pelham Bell Pottinger, for Endeavour International Corporation 
 
 
 
 
END
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