Exhibit 23 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation of our report dated June 22, 2001, included in this Form 11-K for the year ended December 31, 2000, into Occidental Petroleum Corporation's previously filed Registration Statement No. 333-72719. /s/ ARTHUR ANDERSEN LLP Arthur Andersen LLP Los Angeles, California June 28, 2001 28