Research Article
Occurrence and Origin of H2S from Volcanic Reservoirs in Niudong Area of the Santanghu Basin, NW China
Table 3
Hydrochemistry of the formation water from the Niudong area, Santanghu Basin.
| | Sample no. | Stratum | Sampling date | H2S (ppm/m3 air) | mg/L | Type | pH | | K++Na+ | Ca2+ | Mg2+ | Cl- | SO42- | HCO3- | CO32- | Total salinity |
| | ND8-14 | C2k | 2008/8/7 | n.d. | 410 | 864 | 291 | 1755 | 920 | 710 | 268 | 5218 | CaCl2 | 9.3 | | ND78-9 | C2k | 2008/8/6 | 115 | 592 | 545 | 1 | 1652 | 32 | 164 | n.d. | 2986 | NaCl2 | 7.3 | | ND78-812 | C2k | 2010/8/7 | 6 | 371 | 123 | 10 | 512 | 283 | 168 | n.d. | 1467 | NaCl | 6.0 | | ND89-10 | C2k | 2010/10/8 | 44 | 647 | 442 | 24 | 1375 | 329 | 397 | n.d. | 3214 | CaCl2 | 7.0 | | ND8-11 | C2k | 2008/8/7 | 35 | 1008 | 683 | 67 | 1955 | 434 | 1171 | n.d. | 5318 | NaCl | 6.5 | | ND89-9 | C2k | 2008/11/4 | 31 | 592 | 521 | 14 | 1544 | 349 | 123 | n.d. | 3143 | NaCl2 | 6.0 | | ND8-111 | C2k | 2010/5/1 | 13 | 194 | 566 | 98 | 1272 | 47 | 482 | n.d. | 2659 | CaCl2 | 7.0 | | ND89-812 | C2k | 2010/8/24 | 25 | 69 | 315 | 21 | 309 | 495 | 85 | n.d. | 1294 | CaSO4 | 6.0 | | ND9-9 | C2k | 2010/3/7 | 50 | 547 | 384 | 15 | 1393 | 188 | 57 | n.d. | 2584 | CaCl2 | 7.0 | | ND89-91 | C2k | 2010/6/5 | 44 | 869 | 369 | 15 | 1324 | 495 | 596 | n.d. | 3668 | NaCl | 6.0 | | ND 8-71 | C2k | 2007/12/21 | 120 | 386 | 396 | 7 | 1264 | 27 | 36 | 10 | 2126 | CaCl2 | 9.0 | | ND8-10 | C2k | 2007/10/16 | 13 | 394 | 873 | 122 | 1475 | 1288 | 143 | n.d. | 4295 | CaCl2 | 7.7 | | ND8-8 | C2k | 2008/8/7 | 10 | 537 | 404 | 51 | 1368 | 255 | 234 | n.d. | 2849 | NaCl2 | 6.5 |
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Note: these data were provided by the Santanghu Oil Production Plant of Tuha Oilfield Company. pH was tested at room temperature.
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