Reservoir volumes extracted from eclipse prt file:
eclipse/model/2_R001_REEK-2.PRT
---------  ---------------  ---------------  ---------------  ---------------  --------------- 
 REGION      TOTAL PORE       PORE VOLUME      PORE VOLUME     PORE VOLUME       PORE VOLUME   
              VOLUME          CONTAINING       CONTAINING      CONTAINING        CONTAINING    
                                 OIL             WATER            GAS            HYDRO-CARBON  
---------  ---------------  ---------------  ---------------  ---------------  --------------- 
   FIELD        399189010.        51653425.       347535586.               0.        51653425. 
       1         78796150.        19457782.        59338368.               0.        19457782. 
       2         79481140.               0.        79481140.               0.               0. 
       3         75753007.        19126683.        56626325.               0.        19126683. 
       4         74929403.               0.        74929403.               0.               0. 
       5         50117627.        13068960.        37048667.               0.        13068960. 
       6         40111683.               0.        40111683.               0.               0. 
           
