Part I DESIGNATED OWNERS

Amerada Hess Ltd., whose registered office is at 2 Stephen Street, Tottenham Court Road, London W1P 1PL.

Amoco (U.K.) Exploration Company, whose principal place of business in the United Kingdom is at Amoco House, Westgate, Ealing, London W5 1XL.

ARCO British Ltd., whose principal place of business in the United Kingdom is at ARCO House, 48 Grosvenor Street, London W1X 0AN.

Britoil p.l.c., whose registered office is at 301 St. Vincent Street, Glasgow G2 5DD.

Britoil (Alpha) Ltd., whose registered office is at 5 Upper Belgrave Street, London SW1X 8BD.

Chevron U.K Ltd., whose registered office is at 2 Portman Street, London W1H 0AN.

Chevron (UK) Offshore Investments Ltd., whose registered office is at 2 Portman Street, as aforesaid.

Conoco (U.K.) Ltd., whose registered office is at Park House, 116 Park Street, London W1Y 4NN.

Deminex UK Oil and Gas Ltd., whose registered office is at Bowater House, 68 Knightsbridge, London SW1X 7LD.

Enterprise Oil p.l.c., whose registered office is at 5 Strand, London WC2N 5HU.

Esso Exploration and Production UK Ltd., whose registered office is at Esso House, Victoria Street, London SW1E 5JE.

Fina Petroleum Development Ltd., whose registered office is at Petrofina House, 1 Ashley Avenue, Epsom, Surrey KT18 5AD.

Mobil North Sea Ltd., whose registered office is at Mobil Court, 3 Clements Inn, London WC2A 2EB.

Premier Oil Exploration Ltd., whose registered office is at 25 Charlotte Square, Edinburgh EH2 4EZ.

Santa Fe Minerals (UK) Inc., whose principal place of business in the United Kingdom is at Parnell House, 19/28 Wilton Road, London SW1V 1LW.

Shell U.K. Ltd., whose registered office is at Shell-Mex House, Strand, London WC2R 0DX.

Texas Eastern North Sea Inc., whose principal place of business in the United Kingdom is at Berkeley Square House, Berkeley Square, London W1X 5LE.

Ultramar Exploration Ltd., whose registered office is at 141 Moorgate, London EC2M 6TX.