(Reuters) - Chevron Corp said on Friday it would buy smaller rival Anadarko Petroleum Corp for $33 billion (25.24 billion pounds) in cash and stock to strengthen its presence in the Permian basin and beef up its LNG business.The offer of $65 per share represents a 39 percent premium to Anadarko's Thursday close. Anadarko's shares soared 33 percent in light premarket trading, while Chevron shares fell 1.5 percent. "The combination of Anadarko's premier, high-quality assets with our advantaged..