**Exhibit 21.1**

** **

**SUBSIDIARIES OF NEXEN AS AT JANUARY 31, 2008**

 

**1219391Alberta Ltd.**

Incorporatedpursuant to the laws of Alberta

 

**CanadianNexen Petroleum East Al Hajr Ltd.**

Incorporated pursuant to thelaws of Alberta

 

**CanadianNexen Petroleum Yemen**

A partnership doing businessin Yemen

 

**CanadianPetroleum Vietnam Ltd.**

Incorporated pursuant to thelaws of Barbados

 

**CanadianPetroleum Yemen Limited**

Incorporated pursuant to thelaws of Jersey

 

**CanadianOxyOffshore Production Co.**

Incorporated pursuant to thelaws of Delaware

 

**Canexus Limited Partnership**

A partnership formedpursuant to the laws of Alberta

 

**ICH CapitalManagement Hungary Limited Liability Company**

Incorporated pursuant to thelaws of Hungary

 

**ICMAssurance Ltd.**

Incorporated pursuant to thelaws of Barbados

 

**ICM CapitalLimited**

Incorporatedpursuant to the laws of Barbados

 

**InternationalCapital Holdings Limited**

Incorporated pursuant to thelaws of Malta

 

**Long LakeFinance Management Ltd.**

Incorporated pursuant to thelaws of Alberta

 

**Long LakeSynthetic Crude Management Company Ltd.**

Incorporated pursuant to thelaws of Alberta

 

**NexenChemicals Holdings U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

**NexenChemicals U.S.A.**

A partnership formedpursuant to the laws of Delaware

 

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**NexenChemicals U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

**NexenCrossfield Partnership**

A partnership formedpursuant to the laws of Alberta

 

**Nexen E &P Services Nigeria Limited**

Incorporated pursuant to thelaws of Nigeria

 

**NexenEnergy Holdings International Limited**

Incorporated pursuant to thelaws of Jersey

 

**Nexen Energy Marketing EuropeLimited**

Incorporated pursuant to thelaws of the United Kingdom

 

**Nexen Energy Marketing LondonLimited**

Incorporated pursuant to thelaws of the United Kingdom

 

**NexenEnergy Services International Ltd.**

Incorporated pursuant to thelaws of the United Kingdom

 

**NexenEttrick U.K. Limited**

Incorporated pursuant to thelaws of the United Kingdom

 

**Nexen Exploration Norge AS**

Incorporated pursuant to thelaws of Norway

 

**Nexen ExplorationU.K. Limited**

Incorporated pursuant to thelaws of the United Kingdom

 

**Nexen FieldServices Nigeria Limited**

Incorporated pursuant to thelaws of Nigeria

 

**NexenHoldings U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

**NexenHoldings West Africa Limited**

Incorporated pursuant to thelaws of Jersey

 

**NexenMarketing**

A partnership formedpursuant to the laws of Alberta

 

**NexenMarketing International Ltd.**

Incorporated pursuant to thelaws of Barbados

 

**NexenMarketing Singapore Pte Ltd.**

Incorporated pursuant to thelaws of Singapore

 

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**NexenMarketing U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

**Nexen MedHat-Hatton Partnership**

A partnership formedpursuant to the laws of Alberta

 

**Nexen No. 6 Ltd.**

Incorporated pursuant to thelaws of Alberta

 

**Nexen ofCalifornia, Inc.**

Incorporated pursuant to thelaws of Delaware

 

**Nexen Oiland Gas U.S.A. Inc.**

Incorporated pursuant to thelaws of Wyoming

 

**Nexen Oil Sands Partnership**

A partnership formedpursuant to the laws of Alberta

 

**Nexen OilfieldServices Nigeria Ltd.**

Incorporated pursuant to thelaws of Barbados

 

**NexenPetroleum Australia Pty Limited**

Incorporated pursuant to thelaws of Australia

 

**NexenPetroleum Capital Management U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

**NexenPetroleum Colombia Limited**

Incorporated pursuant to thelaws of Jersey

 

**Nexen Petroleum Deepwater NigeriaLimited**

Incorporated pursuant to thelaws of Nigeria

 

**NexenPetroleum do Brasil Ltda.**

Incorporated pursuant to thelaws of Brazil

 

**NexenPetroleum Equatorial Guinea Limited**

Incorporated pursuant to thelaws of Jersey

 

**NexenPetroleum Exploration and Production Nigeria Limited**

Incorporated pursuant to thelaws of Nigeria

 

**NexenPetroleum Holdings Australia Pty Limited**

Incorporated pursuant to thelaws of Australia

 

**NexenPetroleum Holdings U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

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**Nexen Petroleum International Co.**

Amalgamated pursuant to thelaws of Nova Scotia

 

**NexenPetroleum International (U.S.A.) Inc.**

Incorporated pursuant to thelaws of Delaware

 

**NexenPetroleum Libya Ltd.**

Incorporated pursuant to thelaws of Alberta

 

**Nexen Petroleum MadagascarLimited**

Incorporated pursuant to thelaws of Jersey

 

**NexenPetroleum Nigeria Limited**

Incorporated pursuant to thelaws of Nigeria

 

**NexenPetroleum Nigeria Offshore Ltd.**

Incorporated pursuant to thelaws of Alberta

 

**NexenPetroleum North Africa Limited**

Incorporated pursuant to thelaws of Jersey

 

**NexenPetroleum Offshore Equatorial Guinea Ltd.**

Incorporated pursuant to thelaws of Alberta

 

**NexenPetroleum Offshore U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

**NexenPetroleum Operations Yemen Limited**

Continued pursuant to thelaws of Jersey

 

**NexenPetroleum Sales U.S.A. Inc.**

Incorporated pursuant to thelaws of Texas

 

**NexenPetroleum U.K. Holdings Limited**

Incorporated pursuant to thelaws of the United Kingdom

 

**NexenPetroleum U.K. Limited**

Incorporated pursuant to thelaws of the United Kingdom

 

**NexenPetroleum U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

**NexenServices Jersey Limited**

Incorporated pursuant to thelaws of Jersey

 

**Quadra Energy 2006 Ltd.**

Incorporated pursuant to thelaws of Alberta

 

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**Quadra Energy Trading Ltd.**

Incorporated pursuant to thelaws of Alberta

 

**Quadra Fuel Trading, Inc.**

Incorporated pursuant to thelaws of Delaware

 

**Quadra Petroleum, Inc.**

Incorporated pursuant to thelaws of Delaware

 

**WascanaEnergy 2001 Ltd.**

Incorporated pursuant to thelaws of Saskatchewan

 

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