UPDATE 1-Oil cos pull workers, shut port ahead of Ida

* Fast-moving Hurricane Ida strengthens

* Louisiana Offshore Oil Port stops tanker offloading

* Chevron, Anadarko evacuating workers, no output shut (Adds Chevron, Anadarko evacuating workers, Conoco operations normal, byline)

By Erwin Seba

HOUSTON, Nov 8 (Reuters) - Fast-moving, strengthening Hurricane Ida led oil companies to begin evacuating workers on Sunday from the Gulf of Mexico and prompted the nation's only offshore oil port to stop taking foreign crude from tankers.

Chevron Corp (CVX.N: Quote, Profile, Research) and Anadarko Petroleum Corp (APC.N: Quote, Profile, Research) said workers were being evacuated from platforms in the Gulf of Mexico on Sunday, but no oil production was shut in.

The Louisiana Offshore Oil Port, or LOOP, which takes in an average of 1 million barrels of foreign crude from cargo ships daily, stopped offloading tankers shortly after noon CST Sunday (1800 GMT) due to deteriorating sea conditions, according to a spokeswoman.

The LOOP is the only U.S. port capable of handling the largest crude oil tankers.