TORONTO (Standard&Poor's) May 28, 2009--Standard&Poor's Ratings Services today said it assigned its 'BBB' debt rating to Calgary, Alta.-based Talisman Energy Inc.'s US$700 million senior unsecured notes due 2019. "The ratings on Talisman reflect a well-diversified portfolio of upstream assets, the growth potential inherent in the company's undeveloped acreage, and a history of fairly moderate financial policies," said Standard&Poor's credit analyst Jamie Koutsoukis. "However, we believe a continued trend of weak reserve replacement economics, which has resulted in falling internal reserve replacement statistics despite relatively high exploration and development spending, somewhat offsets these strengths," Ms. Koutsoukis added. Officials expect to use proceeds to fund operations and repay fixed-debt maturities. In addition, the company could also