Document:

Brigham
      Exploration Announces Williston Basin Joint Venture

     

    Monday
      April 23, 7:00 am ET 

     

    AUSTIN,
      Texas, April 23 /PRNewswire-FirstCall/ -- Brigham Exploration Company (Nasdaq:
      BEXP
      -
News)
      announced the closing of a joint venture agreement with Northern Oil and Gas
      (OTC: NOGS
      -
News)
      providing for Brigham's participation in approximately 30,300 gross and 24,350
      net acres in the Williston Basin. Roughly 5,120 gross and 3,000 net acres are
      located in Mountrail County North Dakota, providing potential step out and
      extensional drilling to recent high rate producing EOG Resources, Inc. (NYSE:
      EOG
      -
News)
      Bakken
      oil discoveries. In Sheridan County Montana, Brigham and Northern will develop
      and explore an area with existing production from multiple producing horizons.
      A
      portion of the Sheridan County acreage is under approximately 85 square miles
      of
      3-D seismic data previously acquired by Brigham. Brigham anticipates drilling
      at
      least four 2007 wells as part of the joint venture. 

     

    Mountrail
      County, North Dakota Acreage 

     

    Brigham
      expects to participate in at least two horizontal Mountrail County Bakken tests
      this year, the first of which should commence in the third quarter, in an
      attempt to extend Bakken productivity established in the area by EOG. Brigham
      and Northern jointly control acreage in 5,120 gross and 3,000 net acres spread
      across 19 sections, and in three of the sections the companies control a
      majority interest. The southernmost acreage tract is within four miles of EOG's
      production, and is adjacent to currently drilling and recently permitted
      sections. Based on subsurface well control and mapping of the area, Brigham
      and
      Northern believe that their acreage has a good probability for strong Bakken
      production. 

     

    Given
      Northern's acreage investments in the area, terms of the agreement provide
      Brigham with the opportunity to drill to earn in the acreage block. As such,
      Brigham must commence at least one well in 2007 and must drill a total of 3
      net
      wells to earn the balance of the acreage. Under the agreement, Northern has
      the
      right to participate and/or back-in with up to a total of 37% in the first
      net
      well and up to 32.5% in the second two net wells. Brigham will own a minimum
      of
      75% in the balance of the acreage, with Northern owning and having the right
      to
      participate with the other 25%. 

     

    Based
      on
      current data obtained from the North Dakota Industrial Commission, Department
      of
      Mineral Resources, EOG has drilled six Bakken wells in the area, with three
      additional wells currently drilling, and another twelve wells permitted to
      be
      drilled. Initial production rates for four of the wells have been reported
      to
      date, ranging from 463 barrels of oil and 128 Mcf of natural gas per day to
      1,800 barrels of oil and 457 Mcf of natural gas per day, with an average initial
      rate of 1,049 barrels of oil and 278 Mcf of natural gas per day. The first
      well,
      which tested at an initial rate of 463 barrels per day, was last reported to
      be
      producing approximately 304 barrels of oil per day after 10 months of
      production. After producing for three to ten months, production from the three
      initial wells appears to have averaged 303 barrels of oil per day, and the
      three
      wells have reportedly produced a combined 133,430 barrels of oil to date.

     

    Brigham
      currently anticipates at least two Mountrail County joint venture wells
      commencing in 2007, the first during the third quarter, with the second expected
      to commence early in the fourth quarter. Although Brigham's working interest
      in
      the first two wells is still to be determined based on the ultimate location
      of
      the wells, it's anticipated that Brigham's working interest in these wells
      will
      range between 10% and 51%. Assuming all of the acreage is successfully drilled
      on 640 acre spacing, 19 gross or 4.7 net wells could be drilled by Brigham
      and
      Northern to fully develop the joint venture acreage. 

     

    
      
         

      

      
         

        
          

        

      

      
         

      

    

    Sheridan
      County, Montana Acreage 

     

    Brigham
      expects to drill at least two wells in the Sheridan County joint venture acreage
      during 2007, the first of which is expected to commence in the third quarter.
      Brigham and Northern jointly control approximately 25,180 gross or 21,350 net
      acres as part of the joint venture. In addition, Brigham controls approximately
      70,000 additional net acres to the south, all of which is located in Sheridan
      and Roosevelt Counties, Montana. 

     

    As
      part
      of the Northern joint venture in Sheridan County, Brigham expects to operate
      both 2007 Sheridan County wells. The first well is likely to be a Mission Canyon
      development well offsetting another operator's Mission Canyon well that has
      produced approximately 200,000 barrels of oil to date. The Mission Canyon
      objective is found at a depth of approximately 7,600 feet, and it's likely
      Brigham will drill this well horizontally with approximately 3,000 feet of
      lateral displacement. The second well in Sheridan County may also be a Mission
      Canyon test, or possibly a test of a Red River structure, which has established
      quality Red River production. The Red River is encountered at a depth of
      approximately 11,600 feet, and quality Red River producers in the area have
      produced from 250,000 to over 1,000,000 barrels of oil. Based on existing
      production combined with subsurface and 3-D seismic mapping, Brigham believes
      that the Sheridan County acreage provides excellent potential for the discovery
      and development of significant oil and natural gas. 

     

    Given
      Northern's acreage investments in the area, terms of the agreement also provide
      Brigham with the opportunity to drill to earn in the acreage block. As such,
      Brigham is to commence one well by year end 2007 and by 2008 will be subject
      to
      a 120 day continuous development provision in order to earn additional acreage.
      In the first well, Brigham will have a 90% working interest, with Northern
      expected to participate with a 10% working interest. Northern will also retain
      a
      30% back in after payout on Brigham's interest. Brigham will own a 75% working
      interest in the second net well drilled, with Northern having the right to
      participate with the 25% working interest it retains and Northern will receive
      a
      10% back in after payout. In all other wells, Brigham will retain 75% with
      Northern retaining a 25% working interest. Brigham currently anticipates
      commencing its first Sheridan County joint venture well in the third quarter,
      with the second well expected to commence during the fourth quarter.

     

    Bud
      Brigham, the Chairman, President and CEO stated, "We're very excited about
      our
      joint venture with Northern. Subsequent to these joint ventures, we now control
      approximately 160,000 gross and over 144,000 net acres in the Williston Basin,
      providing substantial option value for our shareholders. Importantly, this
      joint
      venture provides us with specific opportunities to drill and develop significant
      proved reserves to positively impact our finding costs and provide net asset
      value growth in 2007. Furthermore, our activity and experience here will benefit
      us as we continue to develop our larger Williston Basin acreage position."
      

     

    About
      Brigham Exploration 

     

    Brigham
      Exploration Company is a leading independent exploration and production company
      that applies 3-D seismic imaging and other advanced technologies to
      systematically explore and develop onshore domestic natural gas and oil
      provinces. For more information about Brigham Exploration, please visit our
      website at www.bexp3d.com
      or
      contact Investor Relations at 512-427- 3444. 

     

    Forward
      Looking Statement Disclosure 

     

    Except
      for the historical information contained herein, the matters discussed in this
      news release are forward looking statements within the meaning of the federal
      securities laws. Important factors could cause our actual results to differ
      materially from those contained in the forward looking statements including
      our
      growth strategies, our ability to successfully and economically explore for
      and
      develop oil and gas resources, anticipated trends in our business our liquidity
      and ability to finance our exploration and development activities market
      conditions in the oil and gas industry our ability to make and integrate
      acquisitions, the impact of governmental regulation and other risks more fully
      described in the company's filings with the Securities and Exchange Commission.
      Forward-looking statements are typically identified by use of terms such as
      "may," "will," "expect," "anticipate," "estimate" and similar words, although
      some forward- looking statements may be expressed differently. All forward
      looking statements contained in this release, including any forecasts and
      estimates, are based on management's outlook only as of the date of this
      release, and we undertake no obligation to update or revise these forward
      looking statements, whether as a result of subsequent developments or otherwise.
      

     

    Contact:
      Rob Roosa, Finance Manager 

     

    512-427-3300EXECUTION

    
 

    AMENDMENT
      NO. 1

     

    to

     

    TRUST
      AGREEMENT

     

    by
      and
      among

     

    STRUCTURED
      ASSET SECURITIES CORPORATION, as Depositor,

     

    AURORA
      LOAN SERVICES LLC, as Master Servicer,

     

    and

     

    LASALLE
      BANK NATIONAL ASSOCIATION, as Trustee

     

    

     

    LEHMAN
      XS
      TRUST

    MORTGAGE
      PASS-THROUGH CERTIFICATES,

    SERIES
      2007-1

    

     

    Dated
      and
      effective as of April 1, 2007

     

    

      
        
           

        

        
           

          
            

          

        

        
           

        

      

    This
      Amendment No. 1 to Trust Agreement, dated and effective as of April 1, 2007,
      by
      and among Structured Asset Securities Corporation, as Depositor, Aurora Loan
      Services LLC, as Master Servicer, and LaSalle Bank National Association, as
      Trustee, recites and provides as follows: 

     

    RECITALS

     

    WHEREAS,
      in connection with the issuance of the Lehman XS Trust Mortgage Pass-Through
      Certificates, Series 2007-1 (the “Certificates”), Structured Asset Securities
      Corporation, as Depositor, Aurora Loan Services LLC, as Master Servicer, and
      LaSalle Bank National Association, as Trustee, have entered into a Trust
      Agreement, dated as of January 1, 2007 (the “Trust Agreement”), for the purpose
      of creating a trust fund (the “Trust Fund”), the assets of which consist
      primarily of a two pools of Mortgage Loans; 

     

    WHEREAS,
      the Depositor, the Master Servicer, and the Trustee desire to amend the Trust
      Agreement as set forth herein; 

     

    WHEREAS,
      Section 11.03(b) of the Trust Agreement provides that the Trust Agreement may
      be
      amended from time to time by the Depositor, the Master Servicer and the Trustee
      and with the consent of the Holders of not less than 66 2/3% of the Class
      Principal Amount (or Percentage Interest) of each Class of Certificates affected
      thereby for the purpose of adding any provisions to or changing in any manner
      or
      eliminating any of the provisions of the Trust Agreement or of modifying in
      any
      manner the rights of the Holders, provided such amendment, as evidenced by
      an
      Opinion of Counsel delivered to the Trustee, does not adversely affect the
      status of any REMIC created pursuant to the Trust Agreement or cause a tax
      to be
      imposed on any REMIC; 

     

    WHEREAS,
      the Trustee has received the Opinion of Counsel required pursuant to Section
      11.03 in the form annexed as Exhibit A hereto; and 

     

    WHEREAS,
      the Trustee has received the consent of the Holders of 100% of the Percentage
      Interest of the Class X Certificates, such Class of Certificates being the
      sole
      Class affected by this Amendment annexed as Exhibit B hereto.

     

    NOW,
      THEREFORE, in consideration of the foregoing and other good and valuable
      consideration, the receipt and sufficiency of which are hereby acknowledged
      by
      the parties, it is mutually covenanted and agreed as follows:

     

    ARTICLE
      I. 

    AMENDMENTS
      TO THE TRUST AGREEMENT

     

    Section
      1.01 Amendments
      to Section 1.01.

     

    (a) The
      definition of Basis
      Risk Shortfall
      is
      hereby deleted in its entirety and replaced with the following: 

     

    “With
      respect to any Distribution Date and any Class of Offered Certificates, the
      amount by which the amount of interest calculated at the Certificate Interest
      Rate applicable to such Class for such date (determined without regard to the
      applicable Net Funds Cap for such date) exceeds the amount of interest
      calculated at the applicable Net Funds Cap.”

     

    
      
         

      

      
        2

        
          

        

      

      
         

      

    

    (b) The
      definition of Maximum
      Interest Rate
      is
      hereby deleted in its entirety.

     

    (c) The
      definition of Unpaid
      Basis Risk Shortfall
      is
      hereby deleted in its entirety and replaced with the following: 

     

    “With
      respect to any Distribution Date and any Class of Offered Certificates, the
      aggregate of all Basis Risk Shortfalls with respect to such Class remaining
      unpaid from previous Distribution Dates, plus interest accrued thereon at the
      applicable Certificate Interest Rate computed without regard to the applicable
      Net Funds Cap.”

     

    ARTICLE
      II. 

    MISCELLANEOUS
      PROVISIONS

     

    Section
      2.01 Capitalized
      Terms.

     

    For
      all
      purposes of this Amendment No. 1, except as otherwise stated herein, terms
      used
      in capitalized form in this Amendment No. 1 and defined in the Trust Agreement
      have the meanings specified in the Trust Agreement.

     

    Section
      2.02 Continuing
      Effect.

     

    Except
      as
      expressly amended by this Amendment No. 1, the Trust Agreement shall remain
      in
      full force and effect in accordance with its terms.

     

    Section
      2.03 References
      to Trust Agreement.

     

    From
      and
      after the execution and delivery of this Amendment No. 1, all references to
      the
      Trust Agreement in the Trust Agreement, any Certificate or any other document
      executed or delivered in connection therewith shall be deemed a reference to
      the
      Trust Agreement as amended hereby, unless the context expressly requires
      otherwise.

     

    Section
      2.04 Severability
      of Provisions.

     

    If
      any
      one or more of the covenants, agreements, provisions or terms of this Amendment
      No. 1 shall be for any reason whatsoever held invalid, then such covenants,
      agreements, provisions or terms shall be deemed severable from the remaining
      covenants, agreements, provisions or terms of this Amendment No. 1 and shall
      in
      no way affect the validity or enforceability of the other provisions of this
      Amendment No. 1 or of the Certificates or the rights of the Holders
      thereof.

     

    Section
      2.05 Counterparts.

     

    This
      Amendment No. 1 may be executed in one or more counterparts, each of which
      shall
      be deemed to be an original, and all of which together shall constitute one
      and
      the same instrument.

     

    
      
         

      

      
        3

        
          

        

      

      
         

      

    

    Section
      2.06 Binding
      Nature of Amendment No. 1.

     

    This
      Amendment No. 1 shall be binding upon and inure to the benefit of the parties
      hereto and their respective successors and permitted assigns. 

     

    Section
      2.07 Headings
      Not To Affect Interpretation.

     

    The
      headings contained in this Amendment No. 1 are for convenience of reference
      only, and shall not be used in the interpretation hereof.

     

    Section
      2.08 Effectiveness.

     

    This
      Amendment No. 1 shall become effective as of the date first written
      above.

     

    Section
      2.09 Governing
      Law.

     

    THIS
      AMENDMENT NO. 1 SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS
      OF THE STATE OF NEW YORK, WITHOUT REFERENCE TO ITS CONFLICT OF LAW PROVISIONS
      (OTHER THAN SECTION 5-1401 OF THE GENERAL OBLIGATIONS LAW), AND THE OBLIGATIONS,
      RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER SHALL BE DETERMINED IN ACCORDANCE
      WITH SUCH LAWS.

      
        
           

        

        
          4

          
            

          

        

        
           

        

      

    IN
      WITNESS WHEREOF, the Depositor, the Master Servicer and the Trustee have caused
      their names to be signed hereto by their respective officers hereunto duly
      authorized as of the day and year first above written.

     

    STRUCTURED
      ASSET SECURITIES

    CORPORATION,
      as Depositor

    

    

    By: /s/
      Nicholas Stimola_              

    Name:
      Nicholas Stimola

    Title:
      Vice President

    

    

    AURORA
      LOAN SERVICES LLC,

    as
      Master
      Servicer

    

    By: /s/
      Linda A. Sherman               

    Name:
      Linda A. Sherman

    Title:
      Senior Vice President

    

    

    LASALLE
      BANK NATIONAL ASSOCIATION,

    as
      Trustee

    

    

    By: /s/
      Andy Streepey                

    Name:
      Andy Streepey

    Title:
      Assistant Vice President

     

    
      
         

      

      
         

        
          

        

      

      
         

      

    

    Exhibit
      A

     

    FORM
      OF OPINION OF COUNSEL

    DELIVERED
      PURSUANT TO SECTION 11.03 

    OF
      THE TRUST AGREEMENT

    

    

    
      	 	
               

               

              April
                20, 2007

            
	
              LaSalle
                Bank National Association

              135
                South LaSalle Street, Suite 1511, 

              Chicago,
                Illinois, 60603

              Attention:
                Global Securities and Trust Services - LXS 2007-1

            	 

    

     

    
      	 	
              Re:    Amendment
                No. 1 to Trust Agreement

            	 

    

     

    Ladies
      and Gentlemen:

     

    You
      have
      requested our opinion in connection with the execution of Amendment No. 1,
      dated
      as of April 1, 2007 (“Amendment No. 1”), to the Trust Agreement (the “Original
      Agreement”) dated as of January 1, 2007, among Structured Asset Securities
      Corporation, in its capacity as Depositor, Aurora Loan Services LLC, as Master
      Servicer, and LaSalle Bank National Association, as Trustee.

     

    Section
      11.03(b) of the Original Agreement provides that the Agreement may be amended
      from time to time by the parties thereto with the consent of the Holders of
      not
      less than 66 2/3% of the Class Principal Amount (or Percentage Interest) of
      each
      Class of Certificates affected thereby for the purpose of “adding any provisions
      to or changing in any manner or eliminating any of the provisions of this
      Agreement or of modifying in any manner the rights of the Holders” and provided
      that such amendment does not adversely affect the status of any REMIC created
      pursuant to the Original Agreement. Section 11.03(b) provides further that,
      prior to entering into any such amendment, the Trustee may require an Opinion
      of
      Counsel to the effect that such amendment is permitted under such
      Section.

     

    As
      special counsel for the Depositor, we have examined and relied upon originals
      or
      copies, certified or otherwise identified to our satisfaction, of such
      instruments, certificates, records and other documents, and have made such
      examination of law, as we have deemed necessary or appropriate for the purpose
      of this opinion. In our examination, we have assumed the legal capacity of
      all
      natural persons, the genuineness of all signatures, the authenticity of all
      documents submitted to us as originals, the conformity to original documents
      of
      all documents submitted to us as certified or photostatic copies or by facsimile
      or other means of electronic transmission, and the authenticity of the originals
      of such latter documents. With your express consent and approval, we have made
      all assumptions in connection with this opinion without further investigation
      or
      inquiry, unless and to the extent otherwise specified. As to facts relevant
      to
      the opinions expressed herein and the other statements made herein, we have
      relied without independent investigation upon certificates and oral or written
      statements and representations of officers and other representatives of the
      Depositor and others. We have assumed that there is not and will not be at
      any
      time any agreement among the parties to Amendment No. 1 that modifies or
      otherwise supplements the agreements of those parties as expressed in the
      Original Agreement and Amendment No. 1.

     

    
      
         

      

      
         

        
          

        

      

      
         

      

    

    Capitalized
      terms used and not defined herein have the meanings assigned to them in the
      Original Agreement.

     

    _____________________________________

     

    The
      advice below was not written to be used, is not intended to be used and cannot
      be used by any taxpayer for purposes of avoiding United States federal income
      tax penalties that may be imposed. The advice is written to support the
      promotion or marketing of the transaction addressed in this opinion. Each
      taxpayer should seek advice based on the taxpayer’s particular circumstances
      from an independent tax advisor. 

     

    We
      are
      providing the foregoing disclaimer to satisfy obligations we have under Circular
      230, governing standards of practice before the Internal Revenue
      Service.

     

    _______________________________________

     

    Based
      upon the foregoing, we are of the opinion that:

     

    (i) The
      execution of Amendment No. 1 by the Trustee is permitted under Section 11.03(b)
      of the Original Agreement; and

     

    (ii) For
      federal income tax purposes, the amendment of the Original Agreement by
      Amendment No. 1 will not result in an Adverse REMIC Event under the Original
      Agreement. 

     

    The
      foregoing opinions deal only with the specific legal issues that each opinion
      explicitly addresses. Accordingly, the express opinions set forth above
      concerning a particular legal issue do not address any other
      matters.

     

    The
      foregoing opinions and other statements are subject to the following
      qualifications, exceptions, assumptions and limitations:

     

    
      	 	
              A.

            	
              Members
                of our firm are admitted to the bar of the State of New York and
                the
                foregoing opinions are limited to matters arising under the federal
                laws
                of the United States of America and the laws of the State of New
                York. We
                express no opinion as to the laws, rules or regulations of any other
                jurisdiction, or as to the municipal laws or the laws, rules or
                regulations of any local agencies or governmental authorities of
                or within
                the State of New York, or in each case as to any matters arising
                thereunder or relating thereto. The opinions set forth in this letter
                express our professional judgment as to how the highest court of
                the
                applicable jurisdiction would appropriately resolve the issues in
                question.

            

    

     

    
      
         

      

      
        A-2

        
          

        

      

      
         

      

    

    
      	 	
              B.

            	
              With
                respect to the Original Agreement, Amendment No. 1 and any other
                instrument or agreement (each, an “Agreement”) executed or to be executed
                by any party (each, a “Party”), we have assumed, to the extent relevant to
                the opinions set forth herein, that (i) such Party (if not a natural
                person) has been duly organized and is validly existing and in good
                standing under the laws of the jurisdiction of its organization and
                has
                full right, power and authority to execute, deliver and perform its
                obligations under each Agreement to which it is a party and (ii)
                each
                Agreement has been duly authorized (if applicable), executed and
                delivered
                by, and is a valid, binding and enforceable agreement or obligation,
                as
                the case may be, of such Party.

            

    

     

    
      	 	
              C.

            	
              In
                rendering the opinion set forth in subparagraph (ii) above, we have
                relied
                on the Internal Revenue Code of 1986, as amended, U.S. Department
                of
                Treasury regulations issued pursuant thereto in temporary or final
                form,
                and various judicial and administrative precedents, any or all of
                which
                are subject to change, which change may be retroactively effective.
                We
                undertake no obligation to update this opinion in the event of any
                such
                changes.

            

    

     

    This
      letter is solely for your benefit in connection with the transaction described
      in the first paragraph above and may not be relied upon by any other person,
      nor
      may this letter be relied upon by you for any other purpose, without our prior
      written consent. We confirm, however, that we are placing no limitation on
      disclosure of the tax treatment or tax structure of the transaction that is
      the
      subject of this opinion.

    

     

    Very
      truly yours,

    

    /s/
      McKee
      Nelson LLP

    

    
 

    
      
         

      

      
        A-3

        
          

        

      

      
         

      

    

    Exhibit
      B

     

    

    LETTER
      OF CONSENT

    (CLASS
      X CERTIFICATES)

    
      
         

      

      
        B-1

        
          

        

      

      
         

      

    

    

    April
      1,
      2007

    

     

    LaSalle
      Bank National Association

    135
      South
      LaSalle Street, Suite 1511, 

    Chicago,
      Illinois, 60603

    Attention:
      Global Securities and Trust Services - LXS 2007-1

    

    Re:    Lehman
      XS Mortgage Pass-Through Certificates, Series 2007-1

     

    Ladies
      and Gentlemen:

     

    Reference
      is made to the Trust Agreement dated as of January 1, 2007 (the “Trust
      Agreement”) among Structured Asset Securities Corporation, as depositor (the
“Depositor”), Aurora Loan Services LLC, as master servicer (the “Master
      Servicer”) and LaSalle Bank National Association, as trustee (the “Trustee”),
      and Amendment No. 1 to the Trust Agreement, (the “Amendment”) dated and
      effective as of April 1, 2007, by and among the Depositor, the Master Servicer
      and the Trustee. Unless otherwise defined herein, all capitalized terms used
      herein shall be defined as set forth in the Trust Agreement.

     

    The
      undersigned, as Holders of 100% of the Percentage Interest of the Class X
      Certificates, such Class of Certificates being a Class affected by the
      Amendment, hereby consent to the Amendment, a copy of which is attached hereto
      as Exhibit A.

     

    

     

    *
      * * *
      *

     

    
      
         

      

      
        B-2

        
          

        

      

      
         

      

    

    Very
      truly yours,

     

    LEHMAN
      PASS-THROUGH SECURITIES INC.

    

    

    

    By:
      _/s/
      Michael Hitzmann____________________

    Name:
      Michael Hitzmann

    Title:
      Authorized Signatory

    

    
      
         

      

      
        B-3

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