Webcast Alert: ATP Oil & Gas Corporation Announces Its Presentation Webcast for the IPAA Oil & Gas Investment Symposium West, San Francisco

Business Wire, Oct 4, 2005

WASHINGTON -- ATP Oil & Gas Corporation (NASDAQ: ATPG) announces the following Webcast:

What: ATP Oil & Gas Corporation's Presentation Webcast for the
IPAA Oil & Gas Investment Symposium West, San Francisco

   When: October 5, 2005 @ 02:25 PM Eastern

   Where: www.atpog.com or at
   http://www.vcall.com/CEPage.asp?ID=95079

   How: Live over the Internet -- Simply log on to the web at either
address above.

   Contact: Sheila Thornton, 713-403-5534 or sthornton@atpog.com

If you are unable to participate during the live webcast, a replay of ATP's presentation will be available on the Company's website at www.atpog.com or at http://www.vcall.com/ClientPage.asp?ID=95079 and at http://www.investorcalendar.com/