Origins and fates of H2S in the Cambrian and Ordovician in Tazhong area: Evidence from sulfur isotopes, fluid inclusions and production data

Cai, Chunfang; Hu, Guoyi; Li, Hongxia; Jiang, Lei; He, Wenjun; Zhang, Baoshou; Jia, Lina; Wang, Tiankai

doi:10.1016/j.marpetgeo.2015.05.007

Cited by 39 publications

(28 citation statements)

References 43 publications

(74 reference statements)

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“…34 [10,21,34]. The large differences indicate that the H 2 S in the Ordovician was probably generated from in situ TSR rather than TSR that happened in the Cambrian [13,21]. A positive relationship exists between 34 S H2S values and 34 S SO4 values ( Figure 5(a)).…”

Section: Sulfur Isotopic Compositionmentioning

confidence: 95%

“…Bedded anhydrites of 44 m∼98 m thick are present in the eastern ZS1 and ZS5 wells [21]. No anhydritic carbonate was observed in the Ordovician, which makes the geological background of TSR in the Tazhong area differentiate from the northeast Sichuan Basin.…”

Section: Structural Units and Stratigraphymentioning

confidence: 96%

“…34 S SO4 values of the O 1-2 y formation water range from 22.7‰ to 29.8‰ with an average of 26‰ which is slightly heavier than that of coeval seawater (Figure 4). 34 [10,21,34]. The large differences indicate that the H 2 S in the Ordovician was probably generated from in situ TSR rather than TSR that happened in the Cambrian [13,21].…”

Section: Sulfur Isotopic Compositionmentioning

confidence: 99%

“…H 2 S, common in the Ordovician carbonate reservoir in the Tazhong area, is generated by TSR [20,21]. H 2 S concentration from the Ordovician in the Tazhong area is less than 10%, which is lower than that in the Khuff formation in Abu Dhabi (up to 50% [6]), the Nisku Formation in western Canada (up to 31% [22]), and the Feixianguan Formation in the northeastern Sichuan basin (up to 17% [23,24]).…”

Section: Geofluidsmentioning

confidence: 99%

“…Sulfur isotopic of bedded anhydrite is from Cai et al [10]. Sulfur isotopic of H 2 S in the Cambrian is from Cai et al [21].…”

Section: North Depressionmentioning

confidence: 99%

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The Effect of Water Chemistry on Thermochemical Sulfate Reduction: A Case Study from the Ordovician in the Tazhong Area, Northwest China

Cai

Jia

et al. 2017

Geofluids

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Formation water chemistry, sulfate sulfur isotopes, and associated H 2 S contents and sulfur isotopes were measured from the Ordovician in Tazhong area, Tarim Basin. The aim is to elucidate the effects of geochemical composition of formation water on thermochemical sulfate reduction (TSR) and potential usage of SO 4 /Cl ratios as a new proxy for TSR extents in areas, where H 2 S and thiaadamantanes (TAs) data are not available. The formation water has SO 4 /Cl ratios from 0.0002 to 0.016, significantly lower than 0.04 to 0.05 from 3 to 7 times evapoconcentrated seawater. Thus, the low values are explained to result from TSR. Furthermore, the SO 4 /Cl ratios show negative correlation relationships to TAs and H 2 S concentrations, indicating that TSR occurred in a relatively closed system and SO 4 /Cl ratio can be used to indicate TSR extents in this area. Extensive TSR in the Cambrian in the Tazhong area, represented by low SO 4 /Cl ratios and high H 2 S and TAs concentrations, is accompanied by formation water with high TDS and Mg concentrations, indicating the effects of water chemistry on TSR under a realistic geological background. In contrast, the low TSR extent in the Ordovician may have resulted from limited TSR reaction duration and total contribution of aqueous SO 4 2− .

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Section: Sulfur Isotopic Compositionmentioning

confidence: 95%

Section: Structural Units and Stratigraphymentioning

confidence: 96%

Section: Sulfur Isotopic Compositionmentioning

confidence: 99%

Section: Geofluidsmentioning

confidence: 99%

“…Sulfur isotopic of bedded anhydrite is from Cai et al [10]. Sulfur isotopic of H 2 S in the Cambrian is from Cai et al [21].…”

Section: North Depressionmentioning

confidence: 99%

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The Effect of Water Chemistry on Thermochemical Sulfate Reduction: A Case Study from the Ordovician in the Tazhong Area, Northwest China

Cai

Jia

et al. 2017

Geofluids

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Hydrocarbon reservoir development in reef and shoal complexes of the Lower Ordovician carbonate successions in the Tazhong Uplift in central Tarim basin, NW China: constraints from microfacies characteristics and sequence stratigraphy

Ngia

Gao

2020

J Petrol Explor Prod Technol

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The analyses of hydrocarbon reservoirs in the high-frequency reef and shoal facies of the Lower Ordovician carbonate successions in the Penglaiba Formation (O1P) and Yingshan Formation (O1–2Y) in the Tazhong (Katake) Uplift in central Tarim basin showed three types of hydrocarbon reservoirs: type 1 associated with synsedimentary facies, type 2 developed by hot active basinal dissolution fluids [mesogenetic fluids, geothermal/hydrothermal fluids and thermochemical sulfate reduction-related fluids] and tectonic activity, and type 3 are hypogenic–epigenetic karst reservoirs formed by meteoric and mesogenetic dissolution fluids. Porosity and permeability development in the reef and shoal facies in the highstand system tracts (HST) of the third-order sequence cycles (SQ1–SQ3) correlates well with regression peaks in O1P and O1–2Y, mostly related to multiphase tectonic activity, long-term exposure, denudation and dissolution in near-surface to shallow burial settings. The carbonate successions in the O1P and O1–2Y are composed of seventeen microfacies (MF-1 to MF-17) deposited on a shallow marine platform. Six main groups of microfacies associations (MFA-1 to MFA-6) were recognized, with each microfacies association corresponding to the transgressive system tracts and HST of SQ1–SQ4 in O1P and O1–2Y. The microfacies represent specific sedimentary environment including platform interior and platform margin deposited under particular hydrodynamic conditions. Tectonics and frequent relative sea-level fluctuation associated with rapid transgression and slow regression favored the deposition of the large-scale vertical stacking, high-frequency reef and shoal facies across the carbonate platforms in this uplift. The hydrocarbon reservoirs in this study have relatively moderate porosity and low permeability, and are somewhat potential reservoirs for hydrocarbon exploration in the Tazhong Uplift.

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A Helmholtz free energy equation of state for the vapor-liquid equilibrium and PVTx properties of the H2S H2O mixture and its application to the H2S H2O NaCl system

Peng

Mao

et al. 2019

Applied Geochemistry

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Origins and fates of H2S in the Cambrian and Ordovician in Tazhong area: Evidence from sulfur isotopes, fluid inclusions and production data

Cited by 39 publications

References 43 publications

The Effect of Water Chemistry on Thermochemical Sulfate Reduction: A Case Study from the Ordovician in the Tazhong Area, Northwest China

The Effect of Water Chemistry on Thermochemical Sulfate Reduction: A Case Study from the Ordovician in the Tazhong Area, Northwest China

Hydrocarbon reservoir development in reef and shoal complexes of the Lower Ordovician carbonate successions in the Tazhong Uplift in central Tarim basin, NW China: constraints from microfacies characteristics and sequence stratigraphy

A Helmholtz free energy equation of state for the vapor-liquid equilibrium and PVTx properties of the H2S H2O mixture and its application to the H2S H2O NaCl system

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