Occidental Petroleum to Hold 1st Quarter 2011 Earnings Conference Call

Occidental Petroleum Corporation (NYSE:OXY) will hold a conference call
on Thursday, April 28, 2011, following the release of its first quarter
2011 financial results. The conference call, which will begin at 11:30
a.m. Eastern, may be accessed by calling 800-473-6123. 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 will not be updated to reflect subsequent material
developments.

First quarter 2011 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 is an international oil and gas
exploration and production company with operations in the United States,
Middle East/North Africa and Latin America regions. Oxy is the fourth
largest U.S. oil and gas company, based on equity market capitalization.
Oxy's wholly owned subsidiary, OxyChem, manufactures and markets
chlor-alkali products and vinyls. Occidental 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

Richard S. Kline (media)

richard_kline@oxy.com

310-443-6249

or

Chris
Stavros (investors)

chris_stavros@oxy.com

212-603-8184

On
the web: www.oxy.com