================================================================================ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (date of earliest event reported): March 21, 2006 NEXEN INC. - -------------------------------------------------------------------------------- (Exact Name of Registrant as Specified in Its Charter) CANADA - -------------------------------------------------------------------------------- (State or Other Jurisdiction of Incorporation) 1-6702 98-6000202 - -------------------------------------------------------------------------------- (Commission File Number) (IRS Employer Identification No.) 801 - 7TH AVENUE S.W. CALGARY, ALBERTA, CANADA T2P 3P7 - -------------------------------------------------------------------------------- (Address of Principal Executive Offices) (Zip Code) (403) 699-4000 - -------------------------------------------------------------------------------- (Registrant's Telephone Number, Including Area Code) NOT APPLICABLE - -------------------------------------------------------------------------------- (Former Name or Former Address, if Changed Since Last Report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (SEE General Instruction A.2. below): [_] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) [_] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) [_] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) [_] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) ================================================================================ ITEM 8.01. OTHER EVENTS. On March 21, 2006, Nexen Inc. announced that drilling and logging operations on the sidetrack well at the Knotty Head discovery on Green Canyon 512 had concluded. The sidetrack encountered all reservoirs seen in the discovery well and approximately 400 feet of net oil pay were logged. Based on results from the first exploration well, Nexen Inc.'s resource estimate for the field is 200 to 500 million barrels of oil equivalent. Nexen believes the majority of the resources are located on its leasehold. Nexen Inc. is the operator of the block with a 25% working interest. Other owners, each with a 25% interest, include Anadarko Petroleum Corporation, BHP Billiton and Chevron. On March 21, 2006, Nexen Inc. issued the press release attached as Exhibit 99.1 hereto. ITEM 9.01. FINANCIAL STATEMENTS AND EXHIBITS. The following Exhibit is filed as part of this report: 99.1 Press Release of Nexen Inc. dated March 21, 2006 SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report on Form 8-K to be signed on its behalf by the undersigned, thereunto duly authorized. Dated: March 22, 2006 NEXEN INC. By: /s/ Rick Beingessner ---------------------------- Name: Rick Beingessner Title: Assistant Secretary EXHIBIT INDEX EXHIBIT DESCRIPTION ------- ----------- 99.1 Press Release of Nexen Inc. dated March 21, 2006