Equilibrium modeling of water-gas systems in Jurassic-Cretaceous reservoirs of the Arctic petroleum province, northern West Siberia

NOVIKOV Dmitry Anatolievich

Table 1. Chemical characteristics of formation waters in northern West Siberia

Strata pH Content/(mg•L-1) HCO3- SO42- Cl- Br- I- F- Na+ Ca2+ Mg2+ Aptian-Albian- Cenomanian 6.1-8.7 (7.6) 31-4882 (737) 1-165 0.3-15.1 0.5-70.3 (27.9) 0.4-29.9 (7.8) 0.1-10.0 (2.1) 0.3-10.0 (4.6) 4-1 672 (316) 2-383 (78) Neocomian 6.0-9.3 (7.6) 84-5490 (929) 1-198 0.3-36.8 0.5-231.8 (28.6) 0.2-114.7 (7.8) 0.1-12.0 (2.4) 0.3-20.6 (4) 5-3 406 (393) 1-680 (29) Upper Jurassic 6.2-9.3 (7.5) 12-3709 (833) 1-248 1.8-37.6 6.7-207.9 (40.6) 0.4-45.0 (5.2) 0.3-8.9 (1.2) 0.4-24.5 (6.3) 8-3 250 (502) 1-680 (29) Middle Jurassic 6.4-9.5 (8.1) 37-3477 (1347) 1-272 1.5-39.6 9.5-214.9 (32.1) 0.3-135.9 (8.1) 0.3-6.0 (1.8) 0.3-23.5 (4.8) 2-3 110 (263) 1-350 (34) Lower Jurassic 7.6-8.9 (8.6) 94-3184 4-213 1.1-28.4 2.0-106.0 (30) 0.5-40.6 (8.5) 0.5-3.9 (2.5) 0.3-16.2 (4.3) 8-1 640 (207) 2-170 (32) Strata Content/(mg•L-1) TDS/(g•L-1) Na+/Cl- Cl-/Br- Ca2+/Cl- B+/Br- K+ NH4+ SiO2 B+ Sr- Aptian-Albian- Cenomanian 4-425 (43) 0.1-39.2 (14.3) 0.9-74.0 (19.2) 0.2-39.4 (6.9) 0.6-200.0 (31.1) 1.5-25.3 (13.85) 0.42-4.28 (1.08) 70-1923 (247) 0.01-0.54 (0.04) 0.01-4.25 (0.04) Neocomian 3-690 (60) 0.2-90.0 (16.5) 1.0-115.0 (33.8) 0.2-87.3 (11.3) 0.4-290.0 (56.6) 2.0-53.0 (11.6) 0.26-4.79 (1.16) 12-1970 (234) 0.01-0.38 (0.06) 0.01-9.79 (0.66) Upper Jurassic 3-502 (114) 0.2-150.0 (39.4) 3.0-86.0 (25.8) 0.3-200.0 (10.1) 1.6-1 320.0 (154.6) 2.0-63.3 (19.9) 0.52-2.28 (1.00) 52-547 (264) 0.01-0.80 (0.05) 0.02-6.23 (0.36) Middle Jurassic 5-840 (110) 3.0-112.5 (23.1) 5.0-130.0 (36.6) 0.5-75.0 (9.9) 1.2-290 (77.6) 2.0-53.1 (14.5) 2.0-3.99 (2.87) 274-1641 (317) 0.01-0.57 (0.04) 0.01-3.44 (0.50) Lower Jurassic 10-380 (108) 7.5-18.0 (11.4) 7.0-85.0 (35.3) 2.6-107.5 (11.1) 2.5-46.8 (12.0) 0.86-1.91 (1.16) 94-724 (253) 0.01-0.27 (0.04) 0.04-3.13 (0.80)