**Exhibit21.1**

**SUBSIDIARIESOF NEXEN AS AT JANUARY 31, 2007**

**1219391 Alberta Ltd.**

Incorporated pursuant to thelaws of Alberta

**Canadian Nexen Petroleum East Al HajrLtd.**

Incorporated pursuant to the laws of Alberta

**Canadian Nexen Petroleum Yemen**

A partnership doing business in Yemen

**Canadian Petroleum Vietnam Ltd.**

Incorporated pursuant to the laws of Barbados

**Canadian Petroleum Yemen Limited**

Incorporated pursuant to the laws of Jersey

**CanadianOxy Offshore Production Co.**

Incorporated pursuant to the laws of Delaware

**Canexus Limited Partnership**

A partnership formed pursuant to the laws of Alberta

**ICH Capital Management HungaryLimited Liability Company**

Incorporated pursuant to the laws of Hungary

**ICM Assurance Ltd.**

Incorporated pursuant to the laws of Barbados

**ICM Capital Limited**

Incorporated pursuant to thelaws of Barbados

**InternationalCapital Holdings Limited**

Incorporated pursuant to the laws of Malta

**Long Lake Finance Management Ltd.**

Incorporated pursuant to the laws of Alberta

**Long Lake Synthetic Crude ManagementCompany Ltd.**

Incorporated pursuant to the laws of Alberta

**Nexen Canada No. 2**

A partnership formed pursuant to the laws of Alberta

**Nexen Canada No. 6**

A partnership formed pursuant to the laws of Alberta

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**Nexen Chemicals Holdings U.S.A. Inc.**

Incorporated pursuant to the laws of Delaware

**Nexen Chemicals U.S.A.**

A partnership formed pursuant to the laws of Delaware

**Nexen Chemicals U.S.A. Inc.**

Incorporated pursuant to the laws of Delaware

**Nexen E & P Services NigeriaLimited**

Incorporated pursuant to the laws of Nigeria

**Nexen Energy Holdings InternationalLimited**

Incorporated pursuant to the laws of Jersey

**Nexen Energy Marketing Europe Limited**

Incorporated pursuant to the laws of the UnitedKingdom

**Nexen Energy Marketing London Limited**

Incorporated pursuant to the laws of the UnitedKingdom

**Nexen Energy Services InternationalLtd.**

Incorporated pursuant to the laws of the UnitedKingdom

**Nexen Ettrick U.K. Limited**

Incorporated pursuant to the laws of the UnitedKingdom

**Nexen Exploration Norge AS**

Incorporated pursuant to the laws of Norway

**Nexen Exploration U.K. Limited**

Incorporated pursuant to the laws of the UnitedKingdom

**Nexen Field Services Nigeria Limited**

Incorporated pursuant to the laws of Nigeria

**Nexen Holdings U.S.A. Inc.**

Incorporated pursuant to the laws of Delaware

**Nexen Holdings West Africa Limited**

Incorporated pursuant to the laws of Jersey

**Nexen Marketing**

A partnership formed pursuant to the laws of Alberta

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**Nexen Marketing International Ltd.**

Incorporated pursuant to the laws of Barbados

**Nexen Marketing Singapore Pte Ltd.**

Incorporated pursuant to the laws of Singapore

**Nexen Marketing U.S.A. Inc.**

Incorporated pursuant to the laws of Delaware

**Nexen No. 6 Ltd.**

Incorporated pursuant to the laws of Alberta

**Nexen of California, Inc.**

Incorporated pursuant to the laws of Delaware

**Nexen Oil and Gas U.S.A. Inc.**

Incorporated pursuant to the laws of Wyoming

**Nexen Oil Sands Partnership**

A partnership formed pursuant to the laws of Alberta

**Nexen Oilfield Services Nigeria Ltd.**

Incorporated pursuant to the laws of Barbados

**Nexen Petroleum Australia Pty Limited**

Incorporated pursuant to the laws of Australia

**Nexen Petroleum Capital ManagementU.S.A. Inc.**

Incorporated pursuant to the laws of Delaware

**Nexen Petroleum Colombia Limited**

Incorporated pursuant to the laws of Jersey

**Nexen Petroleum Deepwater Nigeria Limited**

Incorporated pursuant to the laws of Nigeria

**Nexen Petroleum do Brasil Ltda.**

Incorporated pursuant to the laws of Brazil

**Nexen Petroleum Equatorial GuineaLimited**

Incorporated pursuant to the laws of Jersey

**Nexen Petroleum Exploration andProduction Nigeria Limited**

Incorporated pursuant to the laws of Nigeria

**Nexen Petroleum Holdings AustraliaPty Limited**

Incorporated pursuant to the laws of Australia

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**Nexen Petroleum Holdings U.S.A. Inc.**

Incorporated pursuant to the laws of Delaware

**Nexen Petroleum International Co.**

Amalgamated pursuant to the laws of Nova Scotia

**Nexen Petroleum International(U.S.A.) Inc.**

Incorporated pursuant to the laws of Delaware

**Nexen Petroleum Libya Ltd.**

Incorporated pursuant to the laws of Alberta

**Nexen Petroleum Madagascar Limited**

Incorporated pursuant to the laws of Jersey

**Nexen Petroleum Nigeria Limited**

Incorporated pursuant to the laws of Nigeria

**Nexen Petroleum Nigeria Offshore Ltd.**

Incorporated pursuant to the laws of Alberta

**Nexen Petroleum North Africa Limited**

Incorporated pursuant to the laws of Jersey

**Nexen Petroleum Offshore EquatorialGuinea Ltd.**

Incorporated pursuant to the laws of Alberta

**Nexen Petroleum Offshore SystemsU.S.A. Inc.**

Incorporated pursuant to the laws of Delaware

**Nexen Petroleum Offshore U.S.A. Inc.**

Incorporated pursuant to the laws of Delaware

**Nexen Petroleum Operations YemenLimited**

Continued pursuant to the laws of Jersey

**Nexen Petroleum Sales U.S.A. Inc.**

Incorporated pursuant to the laws of Texas

**Nexen Petroleum U.K. Holdings Limited**

Incorporated pursuant to the laws of the UnitedKingdom

**Nexen Petroleum U.K. Limited**

Incorporated pursuant to the laws of the UnitedKingdom

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**Nexen Petroleum U.S.A. Inc.**

Incorporated pursuant to the laws of Delaware

**Nexen Services Jersey Limited**

Incorporated pursuant to the laws of Jersey

**Quadra Energy 2006 Ltd.**

Incorporated pursuant to the laws of Alberta

**Quadra Energy Trading, Inc.**

Incorporated pursuant to the laws of Delaware

**Quadra Energy Trading Ltd.**

Incorporated pursuant to the laws of Alberta

**Quadra Fuel Trading, Inc.**

Incorporated pursuant to the laws of Delaware

**Quadra Petroleum, Inc.**

Incorporated pursuant to the laws of Delaware

**Wascana Energy 2001 Ltd.**

Incorporated pursuant to the laws of Saskatchewan

**Wittig Energy Resources, L.L.C**

Organized pursuant to the laws of Kansas

 

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