press release

Unocal tests giant gas and condensate discovery on deepwater Ganal PSC offshore Indonesia

El Segundo, Calif., March 22, 2002 -- Unocal Corporation (NYSE: UCL) today said that its Unocal Ganal, Ltd., subsidiary has successfully tested an appraisal well on the giant deepwater Gendalo-Gandang gas field complex offshore Indonesia.

"The gas rates are impressive, but we are most encouraged by the high condensate rates tested from the appraisal well in the Gendalo field," said Charles R. Williamson, Unocal chairman and chief executive officer. "The results demonstrate that this is a world class gas-condensate resource, which could supply gas to Indonesia's Bontang liquefied natural gas (LNG) facilities by the end of the decade, and, more importantly, produce significant liquids even sooner."

Drilling results

The Gendalo-3 well flowed at a daily rate of 30 million cubic feet (mmcf) of gas and 2,200 barrels of condensate from a single interval between 11,559 feet (3,523 meters) and 11,638 feet (3,547 meters) true vertical depth subsea (TVDS). The drillstem test had flowing tubing pressure of 4,114 pounds per square inch on a 40/64-inch choke.

The well has an estimated potential daily production rate at upwards of 90 million cubic feet of gas and 6,000 barrels of condensate per day.

The Gendalo-3 well encountered 102 feet (31 meters) of net pay. The well was drilled in 5,082 feet (1,549 meters) of water to 13,070 feet (3,984 meters) TVDS. The well is located 2.8 miles (4.5 kilometers) east of the Gendalo-1 discovery well in the central portion of the Gendalo-Gandang gas field complex.

Another appraisal well, Gandang-2, was drilled in the northern portion of the complex. This well encountered 185 feet (56 meters) of net gas pay. The well was drilled to 12,000 feet (3,658 meters) TVDS in 5,613 feet (1,711 meters) of water. The Gandang-2 well is located 2.2 miles (3.5 kilometers) south of the Gandang-1 discovery well.

Williamson noted that the reservoirs for the Gendalo and Gandang appraisal wells are both in pressure communication with previous wells, indicating significant resource potential and the robustness of the high quality sand deposition.

Unocal estimates the gross resource potential for the Gendalo-Gandang complex is at least 2.0 to 2.5 trillion cubic feet of gas, plus an associated 50 to 150 million barrels of condensate. Work to certify this resource and plan its development began in early 2001 and will continue.

Unocal Ganal is operator of the Ganal production-sharing contract area. It holds an 80-percent working interest, while Lasmo Ganal, Limited, a subsidiary of ENI, holds the remaining 20-percent working interest.

About Unocal Corporation

Unocal is one of the world's leading independent natural gas and crude oil exploration and production companies. The company's oil and gas activities are in North America, Asia, Latin America, the North Sea, and West Africa. Unocal is one of the world's largest producers of geothermal energy with operations in the Philippines and Indonesia.

This news release contains certain forward-looking statements about Unocal's future production plans, LNG processing capacity and resource potential. Resource potential is a speculative estimate of ultimate recovery (including non-proved resource) based on engineering, geophysical, and geological studies and may include market risk. These statements are not guarantees of future performance. The statements are based upon Unocal's current expectations and beliefs and are subject to a number of known and unknown risks and uncertainties that could cause actual results to differ materially from those described in the forward looking statements. Actual results could differ materially as a result of factors discussed in Unocal's 2001 Annual Report on Form 10-K and subsequent reports filed with the Securities and Exchange Commission.

Cautionary Note to U.S. Investors: The U.S. Securities and Exchange Commission permits oil and gas companies, in their filings with the SEC, to disclose only proved reserves that a company has demonstrated by actual production or conclusive formation tests to be economically and legally producible under existing economic and operating conditions. Unocal uses certain terms in this news release, such as "resource potential," that the SEC's guidelines strictly prohibit Unocal from including its filings with the SEC. U.S. investors are urged to consider closely the disclosure in Unocal's 2001 Annual Report on Form 10-K (SEC File No. 1-8483). Copies of the company's SEC filings are available from the company by calling 800-252-2233. The reports are also available on the Unocal web site. You can also obtain this form from the SEC by calling 800-SEC-0330.

Under the terms of the PSCs, Unocal Indonesia Company and its affiliates, including Unocal Ganal, Ltd., as contractors to Pertamina, the Indonesia national oil company, are entitled to varying shares of the oil and gas produced from commercial discoveries.

Updated: March 2002