2014
DOI: 10.1111/gfl.12105
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Thermochemical and bacterial sulfate reduction in the Cambrian and Lower Ordovician carbonates in the Tazhong Area, Tarim Basin, NW China: evidence from fluid inclusions, C, S, and Sr isotopic data

Abstract: Petrographic features, C, O, S, and Sr isotopes were determined, and fluid inclusions (FI) were analyzed on various stages of vug‐ and fracture‐fillings from the Cambrian and Lower Ordovician reservoirs in the Tazhong area, Tarim basin, NW China. The aim was to assess the origin of pyrite and anhydrite and the processes affecting sulfur during diagenesis of the carbonates. Pyrite from seven wells has δ34S values from −22‰ to +31‰. The pyrites with low δ34S values from −21.8‰ to −12.3‰ were found close to fract… Show more

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Cited by 38 publications
(36 citation statements)
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“…Dissolved sulfates in formation water may have been the reactive reactants of TSR as proposed previously (Cai et al, , 2009bBasuki et al, 2008;Wynn et al, 2010). The H 2 S d 34 S values, mainly from 12 to 18‰, are similar to those of the Upper Cambrian anhydrite veins in the paleo-high in the eastern Tazhong uplift and are a possible source of the H 2 S (Jia et al, 2015). Anhydrite veins have been found only in the Upper Cambrian not in the Ordovician, and are limited to two wells (TZ75 and TC1); thus, it is quite possible that this anhydrite is not to be the main sulfur source for the H 2 S.…”
Section: Origin Of Sour Gassupporting
confidence: 65%
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“…Dissolved sulfates in formation water may have been the reactive reactants of TSR as proposed previously (Cai et al, , 2009bBasuki et al, 2008;Wynn et al, 2010). The H 2 S d 34 S values, mainly from 12 to 18‰, are similar to those of the Upper Cambrian anhydrite veins in the paleo-high in the eastern Tazhong uplift and are a possible source of the H 2 S (Jia et al, 2015). Anhydrite veins have been found only in the Upper Cambrian not in the Ordovician, and are limited to two wells (TZ75 and TC1); thus, it is quite possible that this anhydrite is not to be the main sulfur source for the H 2 S.…”
Section: Origin Of Sour Gassupporting
confidence: 65%
“…Some of the sulfides may have precipitated from the present H 2 S and show d 34 S values ranging from 14.6 to 22.3‰ (n ¼ 6; Cai et al, 2009b;Jia et al, 2015) similar to the H 2 S in the Ordovician. This is expected as no significant S isotope fractionation during pyrite precipitation.…”
Section: H 2 S Precipitation As Metal Sulfides and Incorporation Intomentioning
confidence: 74%
“…4 2− by TSR. TSR is ubiquitous in the carbonate reservoirs the Tazhong area [13,20,21,29,39,40]. TSR in the Cambrian is more extensive than that in the Ordovician, as higher H 2 S concentration, higher TAs concentration, and lower SO 4 /Cl ratio were observed (Table 1).…”
Section: Effects Of Water Evolution On So 4 /Cl Ratiomentioning
confidence: 96%
“…The general stratigraphic columns of the Tazhong area were described previously [20,25,28,29]. Briefly, the Cambrian strata are composed of tidal, platform, and platformmarginal carbonates.…”
Section: Structural Units and Stratigraphymentioning
confidence: 99%
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