Reservoir volumes extracted from eclipse prt file:
eclipse/model/2_R001_REEK-0.PRT
---------  ---------------  ---------------  ---------------  ---------------  --------------- 
 REGION      TOTAL PORE       PORE VOLUME      PORE VOLUME     PORE VOLUME       PORE VOLUME   
              VOLUME          CONTAINING       CONTAINING      CONTAINING        CONTAINING    
                                 OIL             WATER            GAS            HYDRO-CARBON  
---------  ---------------  ---------------  ---------------  ---------------  --------------- 
   FIELD        399202846.        45224669.       353978177.               0.        45224669. 
       1         78802733.        17000359.        61802374.               0.        17000359. 
       2         79481140.               0.        79481140.               0.               0. 
       3         75757104.        17096867.        58660238.               0.        17096867. 
       4         74929403.               0.        74929403.               0.               0. 
       5         50120783.        11127443.        38993340.               0.        11127443. 
       6         40111683.               0.        40111683.               0.               0. 
           
