* Says discovery in deepwater Gulf of Mexico
* Anadarko shares up 4 pct before the bell
* Plains Exploration, Mariner Energy hold stake in the well
* Plains Exploration shrs up 9 pct, Mariner up 17 pct
Jan 27 (Reuters) - Independent oil and natural gas company Anadarko Petroleum Corp (APC.N) said it had encountered 600 net feet of hydrocarbon bearing sands in one of its wells in the deepwater Gulf of Mexico, sending its shares up 4 percent in electronic trading.
The company said the Lucius sidetrack appraisal well in Keathley Canyon Block 875 was drilled to a depth of about 20,600 feet and encountered high quality oil pay with additional gas-condensate pay.
"We anticipate additional appraisal activity in 2010 as we continue to evaluate development options for this very large accumulation," Anadarko said in a statement.
The company has a 50 percent working interest in the Lucius well with Plains Exploration and Production Co PXP.N and Mariner Energy Inc ME.N holding 33.3 percent and 16.7 percent, respectively.
Shares of Anadarko were trading up $2.61 at $66.50 in trading before the bell. Plains Exploration was up 9 percent at $36.05, while Mariner Energy Inc ME.N was up 17 percent at $16.00 in electronic trading before the New York Stock Exchange opened. .
For the alerts, please double click [ID:nWNAB8965] (Reporting by Arup Roychoudhury in Bangalore; Editing by Hezron Selvi)