MELBOURNE -- Standard&Poor's CreditWire 9/6/96 -- Standard&Poor's today has assigned its single-`A' long-term rating to PTTEP International Ltd.'s (PTTEP International) proposed US$200 million 144A notes due 2006. The notes will be guaranteed unconditionally by the parent company, PTT Exploration and Production Public Co. Ltd. (PTTEP). The proceeds from the offering will be used to fund PTTEP International's exploration, development, and production activities, as well as for working capital and other general corporate purposes. PTTEP International was established by PTTEP to invest in oil and gas projects in Thailand and neighboring countries. The rating reflects PTTEP's key public policy role, its close operational ties to the government of Thailand, and a good competitive position in the oil