Établissements Maurel & Prom

A.I.S. Resources Limited
A2D Technologies
Abbot Group Limited
Abington Resources Ltd.
Abraxas Energy Partners, L.P.
Abu Dhabi National Oil Company
Action Energy Inc.
Addax Petroleum Corporation
Aera Energy LLC
Afren plc
AKITA Drilling Ltd.
AltaCanada Energy Corp.
American Natural Energy Corporation
Amerisur Resources PLC
Aminex PLC
Anadarko Algeria Company, LLC
Anderson Energy
Antrim Energy Inc.
Apache North Sea Limited
Arawak Energy Ltd.
Arcis Corporation
Aurado Energy Inc.

Bankers Petroleum Ltd.
Belden & Blake Corporation
Bella Media PLC
Birchcliff Energy Ltd.
Blue Ridge Group, Inc.
Bonavista Energy Trust
BP (China) Holdings Limited
BP Brasil Ltda
BP Exploration Operating Company Limited
BP NGL
Bridge Resources Corp.
Bucking Horse Energy Inc.
BUE Marine Limited

C & C Technologies, Inc.
Cairn Energy PLC
Calfrac Well Services Ltd.
CAMAC International Corporation
CanArgo Energy Corporation
Celtic Exploration Ltd.
Century Energy Ltd.
CEP International Petroleum Ltd.
Cequence Energy Ltd.
Chaparral Energy, Inc.
Chevron U.K. Ltd
China National Offshore Oil Corporation
China National Petroleum Corporation
China North East Petroleum Holdings Limited
Chugach Alaska Corporation
CNPC (Hong Kong) Limited
Cobalt International Energy, L.P.
Cobra Venture Corporation
Connacher Oil and Gas Limited
ConocoPhillips Alaska, Inc.
Consolidated Beacon Resources Ltd.
Corridor Resources Inc.
Crescent Point Energy Corp.
Crew Energy Inc.
Crusader Energy Group Inc.
Cygam Energy Inc.
Cyries Energy Inc.

Dakota Gasification Company
Dana Petroleum plc
Desire Petroleum plc
Destiny Resource Services Corp.
Diaz Resources Ltd.
Dolphin A/S
Doyon, Limited
Dragon Oil PLC

EGPI Firecreek, Inc.
Ellora Energy Inc.
Emerald Energy Plc
EnCana Oil & Gas (USA) Inc.
EnCore Oil plc
Energy Corporation of America
EnerJex Resources, Inc.
Ensign Energy Services Inc.
Ensign United States Drilling Inc.
EQT Production
Eurogas Corporation
Excelsior Energy Limited

Fairborne Energy Ltd.
FairWest Energy Corporation
Falcon Oil & Gas Ltd.
Faroe Petroleum plc
First Calgary Petroleums Ltd.
Flint Hills Resources, LP
Fortress Energy Inc.
Fugro N.V.

Gale Force Petroleum Inc.
Galleon Energy Inc.
GE Oil & Gas
GeoTomo LLC
Global Energy Development PLC
Global Geophysical Services, Inc.
Great Plains Exploration Inc.
Guardian Exploration Inc.
Gulfside Minerals Ltd.

Habanero Resources Inc.
Harbison-Fischer Manufacturing Company
Hardy Oil and Gas plc
Helmerich & Payne International Drilling Co.
Heritage Oil Corporation
Hess Limited
Hilcorp Energy Company
Howard Energy Corp.
Hunt Consolidated Inc.
Hunt Oil Company
Husky Energy Inc.

Imperial Energy Corporation PLC
INPEX Corporation
Insignia Energy Ltd.
Iteration Energy Ltd.

Japan Petroleum Exploration Co. Ltd.
JKX Oil and Gas plc
Jura Energy Corporation

Kaiser-Francis Oil Company
KCA DEUTAG Drilling Limited
Kuwait Petroleum Corporation

Lundin Petroleum AB

Marathon Oil Company
Marathon Oil UK Ltd.
Matador Resources Company
Matrix Energy Services Corporation
Melrose Resources plc
Meridian Petroleum plc
Merit Energy Company
Metalore Resources Limited
Midnight Oil Exploration Ltd.
Montello Resources Ltd.
Mooncor Oil and Gas Corp.
Murphy Exploration & Production Company - International
Murphy Exploration & Production Company - USA
Mustang Fuel Corporation

Nabors Drilling USA, LP
Nabors Well Services
National Iranian Oil Company
National Oil Corporation
Nicklos Drilling Company
Niko Resources Ltd.
Noble Drilling (U.S.) Inc.
North West Oil Group Inc.
NuTech Energy Alliance Corporation
NuVista Energy Ltd.
NXT Energy Solutions Inc.

OAO Gazprom
OAO NOVATEK
OAO Rosneft Oil Company
OAO Tatneft
Occidental Oil and Gas Corporation
Occidental Permian, Ltd.
Oil & Natural Gas Corporation Limited
Oil and Gas Development Company Limited
Oil Search Limited
OJSC Surgutneftegas
One World Investments Inc.

Pacific Energy Resources Ltd.
Pacific Rubiales Energy Corp.
Pan Andean Resources PLC
Paradigm B.V.
Paramount Resources Ltd.
Peak Energy Services Trust
Pebercan Inc.
Perusahaan Pertambangan Minyak Dan Gas Bumi Negara
Petrel Resources plc
Petro Andina Resources Inc.
Petro-Hunt, L.L.C.
PetroBakken Energy Ltd.
Petrobank Energy and Resources Ltd.
Petrobras America Inc.
Petroceltic International plc
PetroKazakhstan Inc.
Petrolifera Petroleum Limited
Peyto Energy Trust
Phoenix Technology Income Fund
Pioneer Oil and Gas
Premier Oil plc
Progress Energy Resources Corp.
Pulse Seismic Inc.
Pyramid Oil Company

Questar Market Resources, Inc.
Questerre Energy Corporation

RAM Energy Resources, Inc.
Ramco Energy plc
Regal Petroleum plc
Rider Resources Ltd.
Rival Energy Ltd.
Roc Oil Company Limited
Rock Energy Inc.
Rocky Old Man Energy Inc.
RPS Energy
RPS Scotia
RWE-DEA Aktiengesellschaft für Mineraloel und Chemie

Saipem America, Inc.
Saipem S.p.A.
Sakhalin Energy Investment Company Ltd.
Samson Investment Company
Saxon Energy Services Inc.
Secunda Marine Services
Sefton Resources, Inc.
Seitel, Inc.
Seneca Resources Corporation
Serica Energy plc
Sharon Energy Ltd.
Shell Canada Limited
Shell Exploration & Production Company
Signa Engineering Corp.
SOCO International plc
Softrock Minerals Ltd.
Spectrum ASA
Sperry Drilling Services
Sterling Energy plc
Sterling Resources Ltd.
Stetson Oil & Gas Ltd.
Stratic Energy Corporation
Sundance Resources, Inc.
Sure Energy Inc.
Sword Energy Inc.
Syncrude Canada Ltd.

TAQA North Ltd.
Texalta Petroleum Ltd.
Texas American Resources Company
TG World Energy Corp.
TGS-NOPEC Geophysical Company ASA
THUMS Long Beach Company
Titan Logix Corp.
Torque Energy Inc.
Total E&P Joslyn Ltd
Total Energy Services Inc.
TRAFINA Energy Ltd.
TransAtlantic Petroleum Corp.
Trek Resources, Inc.
Tribute Resources Inc.
Trican Well Service Ltd.
Trident Resources Corp.
Trinidad Drilling Ltd.
Triple 8 Energy Ltd.
Trivello Energy Corp.
True Energy Trust
TrueStar Petroleum Corporation
Tullow Oil plc
Tuscany Energy Ltd.
Twin Butte Energy Ltd.
TXO plc

Urals Energy PLC
UTS Energy Corporation

Venture Production plc
Verenex Energy Inc.
Vero Energy Inc.

West Energy Ltd.
Western Canada Energy Ltd.
Western States International, Inc.
WesternGeco
Windsor Energy Resources, Inc.
Winstar Resources, Ltd.
Wintershall Holding AG
Woburn Energy Plc

XXL Energy Corp.

Yangarra Resources Ltd.
Yoho Resources Inc.

Zapata Energy Corporation