Apache Corp., Houston, (NYSE, Nasdaq: APA) has closed or is in the process of closing on London-based BP's (NYSE: BP) remaining producing properties on the outer continental shelf of the Gulf of Mexico for US$845 million in cash. The combined acquisition will include 13 producing fields, nine of which are operational, with estimated proved reserves of 19.5 million barrels of liquids and 148 billion cubic feet of gas.