Anadarko to Sell Gulf Assets for \$1.3 Bln  NEW YORK (Reuters) - Anadarko Petroleum Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=APC.N target=/stocks/quickinfo/fullquote"&gt;APC.N&lt;/A&gt; has  agreed to sell oil properties in the Gulf of Mexico to Apache  Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=APA.N target=/stocks/quickinfo/fullquote"&gt;APA.N&lt;/A&gt; and a royalty interest to Morgan Stanley Capital  Group Inc. for a total of \$1.31 billion as part of its plan to  slash debt and buy back stock, the company said on Friday.