Genetic origin of sour gas condensates in the Paleozoic dolomite reservoirs of the Tazhong Uplift, Tarim Basin

Zhang, Shuichang; Jin, Sheng; Huang, Haiping; He, Kun; Yü, Wang; Wang, Huitong; Zhang, Bin; Wang, Xiaomei; Hu, Junru

doi:10.1016/j.marpetgeo.2015.08.016

Cited by 33 publications

(19 citation statements)

References 39 publications

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“…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]). The low concentrations of H 2 S in the Tazhong area are considered to result from TSR process which is limited by the burial temperature [25,26]. Besides, TSR process can be limited by water chemistry [8].…”

Section: Geofluidsmentioning

confidence: 99%

“…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%

“…# Note that n is from Cai et al [10], * is from Cai et al [21], # is Cai et al [13], & is from Li and Cai [33], ¶ is from Zhang et al [25], and "-" represents no data available. Ordovician carbonate reservoir has 34 S H2S values lighter than coeval seawater (22∼26‰, [36]) and formation water (Figure 4).…”

Section: 6mentioning

confidence: 99%

“…The relatively lower H 2 S concentration and higher 34 S SO4-H2S differences in the O 1-2 y Formation than those in the Cambrian may indicate that only part of the dissolved SO 4 2− was reduced in situ in the Tazhong area, and TSR in the Ordovician is in the early stage. Zhang et al [25] and Su et al [26] also suggested that the overall TSR extent in the Ordovician of the Tazhong area is limited by the burial temperatures that reservoirs experienced. In other words, TSR extent is low and dissolved SO 4 2− is excessive for in situ TSR in the Ordovician of the Tazhong area.…”

Section: 6mentioning

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: Geofluidsmentioning

confidence: 99%

Section: Structural Units and Stratigraphymentioning

confidence: 99%

Section: 6mentioning

confidence: 99%

Section: 6mentioning

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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“…Diamondoid hydrocarbons have been found in petroleum (e.g. Landa and Machacek, 1933;Wingert, 1992;Zhang et al, 2015) and also in organic-rich sedimentary rocks including coals (Schulz et al, 2001;Wei et al, 2006b). Due to their cage structure, diamondoids are relatively stable molecules and may therefore become concentrated in an oil during thermal cracking (e.g.…”

Section: Introductionmentioning

confidence: 99%

Composition of Diamondoids in Oil Samples From the Alpine Foreland Basin, Austria: Potential as Indices of Source Rock Facies, Maturity and Biodegradation

Pytlak

Kowalski

Groß

et al. 2017

Journal of Petroleum Geology

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Twenty‐seven oil samples from Cretaceous, Eocene and Rupelian reservoir rocks in the Alpine Foreland Basin (Austria) were analysed to evaluate the composition of diamondoid hydrocarbons using gas chromatography – triple quadrupole mass spectrometry. The oils were generated from marly and shaly Oligocene source rocks buried beneath the nappes of the Alpine foldbelt to the south of the study area. Diamondoid hydrocarbons were detected in the saturated fraction of all the analysed oils. A biodegraded oil sample from a shallow reservoir in the NE part of the study area showed an enrichment in diamondoids due to the molecule's high resistance to microbial degradation. Variations in the organic matter type of the source rock facies and differences in maturity are known to influence the composition of diamondoids. However in this study, biomarker‐derived maturity parameters do not show a convincing correlation with diamondoid maturity parameters. Moreover, no cracking trend based on biomarkers and diamondoid concentrations was observed. The results indicate that the composition of diamondoids in oils from the Austrian part of the Alpine Foreland Basin is mainly controlled by heterogeneities in the Lower Oligocene source rocks, including the occurrence of a redeposited source rock succession in the western part of the study area. By contrast, EAI‐1 (the ethyladamantane index) shows a good correlation with various maturity parameters and seems to be independent of source rock facies.

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Detection and significance of higher thiadiamondoids and diamondoidthiols in oil from the Zhongshen 1C well of the Tarim Basin, NW China

Jin

Zhu

et al. 2018

Sci. China Earth Sci.

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Genetic origin of sour gas condensates in the Paleozoic dolomite reservoirs of the Tazhong Uplift, Tarim Basin

Cited by 33 publications

References 39 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

Composition of Diamondoids in Oil Samples From the Alpine Foreland Basin, Austria: Potential as Indices of Source Rock Facies, Maturity and Biodegradation

Detection and significance of higher thiadiamondoids and diamondoidthiols in oil from the Zhongshen 1C well of the Tarim Basin, NW China

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