Alamo Resources	Edge Petroleum	McMoran O & G
Anadarko Petroleum Corporation	EnCana O & G	Medco Energy US
Apache Corporation	Endeavor Natural Gas	Merit Energy
APEX Oil & Gas	Energy Partners	Murphy Exploration
Arena Offshore	Energy XXI	Newfield Exploration
Aries Resources	ENI US Operating	Noble Energy
ATP Oil & Gas	Enron	ORX Exploration
Badger Oil Corporation	EOG Resources	Plains Exploration
Basin Exploration	EXCO Resources	Range Energy Ventures
Bass Enterprises	Extex Operating	Renaissance Petroleum
BEPCO	Felice Exploration	Ridgelake Energy
Beryl Oil & Gas	Flex Energy	Samson Contour Energy
Block “T”	Gold King Operating	Samson Lone Star
Boss E & P	GOM Shelf	Sanchez O&G
BP	Hallwood Petroleum	Southwestern Energy
Breton Energy	HESS Corporation	SPN Resources
Burlington Resources	Hilcorp Energy	St. Mary Land & Exploration
Centurion Exploration	Hunt Petroleum	Stone Energy Corporation
Century Exploration	Jordan O & G	Summit Energy
Chesapeake Energy	Kerr-McGee O & G	TANA Exploration
Chevron	Kerr-McGee China	Texas Petroleum Investments
Cheyenne Petroleum	Kosmos Energy	Toce Operating
Cimarex Energy	Layline Petroleum	Tullow Ghana Limited
Clovelly Oil Company	LEED Petroleum	Ultra Petroleum
ConocoPhillips	LLOG Exploration	US Liquids
Cornerstone E&P	Mack Energy	VENOCO
Devon Energy	Manti Operating	Woodside Energy
Dominion E & P	Mariner Energy	XTO Energy
Dune Operating	Maritech Resources
Dynamic Offshore Resources	Marlin Coastal