Occidental Petroleum 1st Quarter 2013 Results to be Announced April 25, 2013

Occidental
Petroleum Corporation (NYSE:OXY) will hold a conference call on
Thursday, April 25, 2013, following the release of its first quarter
2013 financial results. The conference call, which will begin at 11:30
a.m. Eastern, may be accessed by calling 800-473-6123 (for international
callers dial 973-582-2710). The conference call also can be heard live
on the company's website, www.oxy.com.

All remarks made during the conference call will be current at the time
of the call and may not be updated to reflect subsequent material
developments.

First quarter 2013 financial results will be available through the
Investor Relations section of the company's website concurrent with the
SEC filing. An archived edition of the conference call also will be
available on the website within several hours after the call is
completed.

About Oxy

Occidental
Petroleum Corporation (OXY) is an international oil and gas
exploration and production company with operations in the United States,
the Middle East region and Latin America. Oxy is one of the largest U.S.
oil and gas companies, based on equity market capitalization. Oxy's
wholly owned subsidiary OxyChem manufactures and markets chlor-alkali
products and vinyls. Oxy is committed to safeguarding the environment,
protecting the safety and health of employees and neighboring
communities and upholding high standards of social responsibility in all
of the company's worldwide operations.

Occidental Petroleum Corporation

Media

Melissa E. Schoeb

310-443-6504

melissa_schoeb@oxy.com

or

Investors

Chris
Stavros

212-603-8184

chris_stavros@oxy.com

On
the web: www.oxy.com