HOUSTON, Sept. 23, 2004 - Environmental Remediation Holding Corporation (ERHC) (OTCBB:ERHC) announced today that it has signed a participation agreement with Noble Energy International, Ltd., a subsidiary of Noble Energy Inc. (NYSE:NBL) whereby the companies will jointly evaluate and negotiate participation in Block 4 of the Nigeria/Democratic Republic of Sao Tome and Principe Joint Development Zone ("JDZ") in the Gulf of Guinea, offshore West Africa.

This will continue Noble's recent expansion in West Africa and should complement its successful activities in Equatorial Guinea. Noble's successes in production and marketing of natural gas, condensate and gas utilization give it additional flexibility in evaluating and monetizing hydrocarbon discoveries.

Mr. Ali Memon, president and CEO of ERHC, said today: "Noble's experience and superior performance in deep water and participation in record setting offshore operations are factors that make Noble an excellent choice for ERHC."

ERHC is an oil and gas company focused on exploration in the Gulf of Guinea offshore West Africa. ERHC's headquarters are in Houston. For more information, visit ERHC's Web site at www.erhc.com.

Noble Energy, based in Houston, ranks as one of the largest independent exploration and production companies in the United States with operations throughout the major basins in the United States including the deepwater Gulf of Mexico, as well as internationally, in Argentina, China, Ecuador, Equatorial Guinea, the Mediterranean Sea and the North Sea. Noble Energy markets natural gas and crude oil through its subsidiary, Noble Energy Marketing Inc. For more information, visit Noble's Web site at www.nobleenergyinc.com.

The statements in this document are forward-looking statements made pursuant to the Safe Harbor Provisions of the Private Securities Litigation Reform Act of 1995. These statements and the business prospects of ERHC are subject to a number of risks and uncertainties that may cause actual results in future periods to differ materially from the forward-looking statements. These risks and uncertainties are described on Forms 10-Q and 10-K filed with the Securities and Exchange Commission.