
 Dec 19,2006 13:54:19                                                                                               Page 1








                                         HydroCarbonPoreVolume Computation for Hammerhead2


                                                          Scott Cranswick


                                                            bft_sc_logs







                                                           SUMMARY REPORT











 Dec 19,2006 13:54:19                                                                                               Page 2







                                             LAYER SUMMATION DATA - TRUE VERTICAL DEPTH
                                                       (All Processed Wells)
                                             ------------------------------------------











 +------------------------+-----------------------+------------------------------+-------------------------------------------------+
 |Layer Data              |Net - Average          |Net Reservoir - Average       |Net Pay - Average                                |
 +------------------------+-----------------------+------------------------------+-------------------------------------------------+
 |             Avg    Avg | Net        Shale      |      PHI-         Avg   Net /|      PHI-  HPHI- Perm-           Avg       Net /|
 |            Gross  Gross|Thick  Net  Thick Shale|Thick Thick  Avg   Clay  Gross|Thick Thick Thick Thick  Avg  Avg Clay Avg  Gross|
 |Name        Thick   PHI | (ft)   %    (ft)   %  | (ft) (ft)   PHI   Vol   Ratio| (ft)  (ft)  (ft)(mD-ft) PHI  Sw  Vol  Perm Ratio|
 +------------------------+-----------------------+------------------------------+-------------------------------------------------+
 |HCPV_Layer 3719.00 1190.8|2023.52023.51695.51695.|2020.501361468.673.828653.729-0.000|1934.512453111139076N/A643.7454.92638.10N/A-0.000|
 +------------------------+-----------------------+------------------------------+-------------------------------------------------+

 Dec 19,2006 13:54:19                                                                                               Page 3
                                                          WELL INFORMATION
                                                          ----------------









                                        Project:        bft_sc_logs                                                                 

                                        Field:          beaufort                                                                    

                                        Operator:       AMOCO PRODUCTION                                                            

                                        Well:           y00849_002_hammerhead                                                       

                                        Well Location:  Lat/Long (deg):  70.2751   /-141.516                                        
                                                        X/Y (m):         930348    /7.83732e+06                                     
                                                        Legal:           N/A                                                        
                                                        State:           OFFSHORE FEDERAL WATERS ALASKA                             
                                                        Country:         N/A                                                        

                                        Elevation:      KB (ft):          40.000                                                    
                                                        GL (ft):         N/A                                                        
                                                        MSL (ft):        N/A                                                        




 Dec 19,2006 13:54:19                                                                                               Page 4



                                                       y00849_002_hammerhead






                               SUMMARY FOR RESERVOIR RESERVOIR MODEL NOT IN USE SUMMATION MODEL HCPV
                               ---------------------------------------------------------------------






                                                                            MD               TVD             TVT             TST    
                                                                            --               ---             ---             ---    

                 Top of zones:                                          2700            2700            N/A             N/A         
                 Base of zones:                                         6419            6419            N/A             N/A         

                 Total gross thickness for all zones:                   N/A             N/A             N/A             N/A         
                 Total net thickness for all zones:                     N/A             N/A             N/A             N/A         
                 Total net reservoir thickness for all zones:           N/A             N/A             N/A             N/A         
                 Total net pay thickness for all zones:                 N/A             N/A             N/A             N/A         
                 Thickness-weighted net reservoir to gross ratio:       N/A             N/A             N/A             N/A         
                 Thickness-weighted average net pay porosity:           N/A             N/A             N/A             N/A         
                 Thickness-weighted average net pay Sw:                 N/A             N/A             N/A             N/A         

                 Cumulative porosity thickness for all zones:           N/A             N/A             N/A             N/A         
                 Cumulative permeability thickness for all zones:       N/A             N/A             N/A             N/A         
                 Cumulative hydrocarbon thickness for all zones:        N/A             N/A             N/A             N/A         

 Dec 19,2006 13:54:19                                                                                               Page 5
                                                     ZONE SUMMATION PARAMETERS
                                                     -------------------------






  Well:   y00849_002_hammerhead                                                                                                     
                                                                     Curves used:    Clay Volume:        VSH [A183011]              
                                                                                     Porosity:           PIGN [A41317]              
                                                                                     Water Saturation:   SUWI [A41319]              
                                                                                     Permeability:       Not used                   
                                                                                     Discriminator 1:    Not used                   
                                                                                     Discriminator 2:    Not used                   

                                                                     Discriminator Application Point 1:  Initial                    
                                                                     Discriminator Application Point 2:  Initial                    

                                                                     Averaging used for Permeability:    Geometric                  


  +-------------------------------------------------------------------+----------+--------------------------------------------------+
  |                       Top      Bottom   Gross    Net Res. Net Pay |Dip       |                                 Discr1  Discr2   |
  |                      Depth     Depth    Thick.   Thick.   Thick.  |Correction|VSH      PIGN    SUWI    KINT    Not     Not      |
  |Zone Name             (feet)    (feet)   (feet)   (feet)   (feet)  |Factors   |max      min     max     min     used    used     |
  +-------------------------------------------------------------------+----------+--------------------------------------------------+
  |HCPV_Zone              2700.00   6419.00 3719.000 2020.500 1934.500|          |   0.500   0.100   0.700   1.000 N/A     N/A      |
  |                                         3719.000 2020.500 1934.500|TVD 1.000 |                                                  |
  +-------------------------------------------------------------------+----------+--------------------------------------------------+

 Dec 19,2006 13:54:19                                                                                               Page 6
                                                       y00849_002_hammerhead






                                                ZONE SUMMATION DATA - MEASURED DEPTH
                                                ------------------------------------












 +---------------------------------------+------------------------------+-----------------------------------------------------------+
 |Zone / Interval Data                   |Net Reservoir                 |Net Pay                                                    |
 +---------------------------------------+------------------------------+-----------------------------------------------------------+
 |                Top      Bottom  Gross |       PHI-              Avg  |       PHI-   HPHI-  Perm-               Avg         Net / |
 |                Depth    Depth   Thick.|Thick. Thick.   Avg      Clay |Thick. Thick. Thick. Thick.  Avg    Avg  Clay   Avg  Gross |
 |Zone Name       (feet in MD)     (feet)|(feet) (feet)   PHI      Vol  |(feet) (feet) (feet) (mD-ft) PHI    Sw   Vol    Perm Ratio |
 +---------------------------------------+------------------------------+-----------------------------------------------------------+
 |HCPV_Zone     2700.00  6419.00 3719.00 |2020.50  673.83  0.333  0.324 |1934.50643.74 588.82 N/A     0.33   0.09   0.33 N/A   0.52 |
 +---------------------------------------+------------------------------+-----------------------------------------------------------+
 |TOTALS/AVERAGES OVER ALL ZONES:3719.00 |2020.50  673.83  0.333  0.324 |1934.50643.74 588.82 N/A     0.33   0.09   0.33 N/A   0.52 |
 +---------------------------------------+------------------------------+-----------------------------------------------------------+

 Dec 19,2006 13:54:19                                                                                               Page 7
                                                       y00849_002_hammerhead






                                             ZONE SUMMATION DATA - TRUE VERTICAL DEPTH
                                             -----------------------------------------












 +---------------------------------------+------------------------------+-----------------------------------------------------------+
 |Zone / Interval Data                   |Net Reservoir                 |Net Pay                                                    |
 +---------------------------------------+------------------------------+-----------------------------------------------------------+
 |                Top      Bottom  Gross |       PHI-              Avg  |       PHI-   HPHI-  Perm-               Avg         Net / |
 |                Depth    Depth   Thick.|Thick. Thick.   Avg      Clay |Thick. Thick. Thick. Thick.  Avg    Avg  Clay   Avg  Gross |
 |Zone Name       (feet in TVD)    (feet)|(feet) (feet)   PHI      Vol  |(feet) (feet) (feet) (mD-ft) PHI    Sw   Vol    Perm Ratio |
 +---------------------------------------+------------------------------+-----------------------------------------------------------+
 |HCPV_Zone     2700.00  6419.00 3719.00 |2020.50  673.83  0.333  0.324 |1934.50643.74 588.82 N/A     0.33   0.09   0.33 N/A   0.52 |
 +---------------------------------------+------------------------------+-----------------------------------------------------------+
 |TOTALS/AVERAGES OVER ALL ZONES:3719.00 |2020.50  673.83  0.333  0.324 |1934.50643.74 588.82 N/A     0.33   0.09   0.33 N/A   0.52 |
 +---------------------------------------+------------------------------+-----------------------------------------------------------+

 Dec 19,2006 13:54:19                                                                                               Page 8
                                                              GLOSSARY
                                                              --------

    Abbreviations                                                                                                                   
        Avg.                            Average                                                                                     
        GL                              Ground Level                                                                                
        h                               Depth Increment within Zone                                                                 
        HPHI                            Hydrocarbon pore-thickness                                                                  
        KB.                             Kelly Bushing                                                                               
        MSL                             Mean Sea Level                                                                              
        Perm.                           Permeability                                                                                
        PHI                             Porosity                                                                                    
        Sw                              Water Saturation                                                                            
        Thick.                          Thickness                                                                                   
        TST                             True Stratigraphic Thickness                                                                
        TVT                             True Vertical Thickness                                                                     
        Vcl                             Clay Volume                                                                                 
        ZGH                             Gross Thickness for zone                                                                    
        ZH                              Zone Thickness                                                                              
        ZNRH                            Net Reservoir Thickness for Zone                                                            
        ZPHI                            Average Porosity for Zone                                                                   

    Calculations/Cutoffs                                                                                                            
        Gross                           Depths passing 'Initial' discriminator                                                      
        Net                             Depths passing Gross, Clay Volume cutoffs and 'Net' discriminator                           
        Net Reservoir                   Depths passing Net, Porosity cutoffs and 'Net_Reservoir' discriminator                      
        Net Pay                         Depths passing Net Reservoir, Sw, Permeability cutoffs and 'Net_Pay' discriminator          

    Summations                                                                                                                      
        Thick.                          Sum(h)                                                                                      
        PHI-Thick.                      Sum(Porosity * h)                                                                           
        HPHI-Thick.                     Sum(Porosity * h * (1 - Water saturation))                                                  
        Perm-Thick.                     Sum(Permeability * h)                                                                       

    Averages                                                                                                                        
        Avg PHI                         Sum(Porosity * h)/Sum(h)                                                                    
        Avg Clay Vol                    Sum(Clay Volume * h)/Sum(h)                                                                 
        Avg Perm (Arithmetic)           Sum(Permeability * h)/Sum(h)                                                                
        Avg Perm (Geometric)            10**(Sum(LOG10(Permeability) * h)/Sum(h))                                                   
        Avg Perm (Harmonic)             Sum(h) / Sum(h/Permeability)                                                                
        Avg Sw                          Sum(Porosity * Water Saturation * h)/Sum(Porosity * h)                                      

    Thickness-weighted Averages                                                                                                     
        Net Reservoir to Gross Ratio    Sum(ZNRH/ZGH * ZH)/Sum(ZH)                                                                  
        Average Porosity                Sum(ZPHI * ZH)/Sum(ZH)                                                                      
        Average Sw                      Sum(ZSW * ZH)/Sum(ZH)                                                                       

    Ratios                                                                                                                          
        Net / Gross Ratio               Net Pay Thickness / Gross Thickness                                                         

    Output                                                                                                                          
        SFLG                            Sand Flag Curve                                                                             
        RFLG                            Reservoir Flag Curve                                                                        
        PFLG                            Pay Flag Curve                                                                              
