Isotopic evidence of TSR origin for natural gas bearing high H2S contents within the Feixianguan Formation of the northeastern Sichuan Basin, southwestern China

Zhu, Guangyou; Zhang, Shuichang; Yingbo, Liang; Dai, Jianhua; Li, Jian

doi:10.1360/082004-147

Cited by 113 publications

(74 citation statements)

References 20 publications

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“…In other words, water may not act as an important hydrogen source for H2S origin in a typical natural gas reservoir. This is consistent with most previous studies that high contents of H2S in petroleum reservoirs are mainly derived from interactions between sulfur bearing minerals and hydrocarbons [3,[11][12][13][14][33][34][35][36].…”

Section: Fig 4 Possible Formation Mechanism Of Pyrrhotite During Thesupporting

confidence: 93%

“…Pyrite is widespread in sediments and ore deposits [20][21][22][23][24], often comprising in excess of 5% of total rock volume [25]. It has long been accepted that pyrite is a by-product of bacterial sulfate reduction (BSR) [3,[26][27][28][29][30][31][32] and/or thermochemical sulfate reduction [3,[11][12][13][14][33][34][35][36]. Xie et al [37] found that large amounts of H2S were released from the reaction between n-hexane and pyrite at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Hydrolysis of Pyrite: a Possible Pathway for Generation of High Concentrations of H2S Gas in Deep-buried Reservoirs?

Ding¹,

Liu²

2017

Development in Earth Science

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Sulfates are conventionally regarded as the main sulfur source for H2S gas in sedimentary basins. In recent years, however, some theoretical insights and laboratory experiments indicate that accumulation of H2S in carbonate gas reservoirs may be associated with pyrite. In this paper, thermodynamic analysis and simulation experiments on the interactions between pyrite and water were carried out to investigate the possibility of pyrite hydrolysis in diagenetic environments. The results show that hydrolysis of pyrite possibly takes place above 275 o C. When temperature is above 425 o C, the reaction can proceed spontaneously. The temperature range favoring the occurrence of pyrite hydrolysis is far higher than that for typical oil and gas reservoirs. Thermodynamically pH has negligible influence on the formation of H2S during hydrolysis of pyrite in sedimentary basins. The results of our simulation experiments strongly imply that a small amount of pyrrhotite (FeS1.13) was formed during pyrite decomposition. Nevertheless, significant hydrolysis of pyrite did not occur under closed experimental conditions. Water may not act as an important hydrogen source for H2S generation in a typical natural gas reservoir.

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Section: Fig 4 Possible Formation Mechanism Of Pyrrhotite During Thesupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Hydrolysis of Pyrite: a Possible Pathway for Generation of High Concentrations of H2S Gas in Deep-buried Reservoirs?

Ding¹,

Liu²

2017

Development in Earth Science

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“…TSR produces a toxic and corrosive H 2 S which reduced oil quality and value, and also it may take great adverse effect on health and equipment. Moreover scholars discovered that TSR may improve the porosity and permeability [10,11] , so TSR has received much concern recently in China in the exploration of carbonate rocks and organic geochemistry.…”

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confidence: 99%

Detection of 2-thiaadamantanes in the oil from Well TZ-83 in Tarim Basin and its geological implication

et al. 2008

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Thermochemical sulfate reduction (TSR) causes increasing of sulfur content in the oils, reduction of oil quality, and produces a toxic and corrosive H 2 S which may take great adverse effect on health and equipment. Although there are several ways to identify presence of TSR in gas field, yet in the case of oil with low H 2 S content, it is still very difficult to identify TSR. 2-thiaadamantanes is one of the most effective indicators of TSR. This paper for the first time discovers 2-thiaadamantanes in the oil from Well TZ-83 in Tarim Basin. A silver nitrate silica gel chromatography was used to enrich the oil from low 2-thiaadamantanes content to the level that GC/MS and GC/MS/MS can detect. 2-thiaadamantanes were assigned by comparison of mass spectra with published data, and the fragmental ions in mass spectra were confirmed by MRM mode of GC/MS/MS. H 2 S gas produced in Tazhong area is thought to be generated from TSR since 2-thiaadamantanes were present in the oil.

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“…Therefore, the occurrence and scale of faults have become the important factors affecting the degree of gas washing action and the effect of migration and fractionation. The faults significantly promoted the development of karsts, in close relation to the change of tectonic stress in fault zones and the nature of structural activities (Kim, 2005;Zhu et al, 2005b;. Faults developed in multiple stages are more helpful for the development of karsts along fault zones, because they facilitate opening of faults and allow for smooth water circulation (Gartrell et al, 2004;Brita et al, 2006).…”

Section: Analysis Of Accumulation Process Of Quasi-layered Reservoirsmentioning

confidence: 99%

Characteristics and Accumulation Mechanism of Quasi-Layered Ordovician Carbonate Reservoirs in the Tazhong Area, Tarim Basin

Wang

Jin

Zhu

et al. 2013

Energy Exploration & Exploitation

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Weathered crust reservoirs of marine carbonate rocks and large-area quasilayered carbonate reservoirs controlled by massive unconformity surfaces have become an important play for exploration of marine hydrocarbons across China. In the Tazhong area, oil and gas originating from the marine facies of the Ordovician Yingshan formation, present large-scale integrated continuous accumulation along massive structures. In particular, they are accumulated continuously in layered form in carbonate fracture-cavity reservoir system, and not controlled by tertiary structural belts. Moreover, the Yingshan reservoirs are complex in types, comprising cross distribution of high gas/oil ratio (GOR) condensate gas reservoirs, volatile oil reservoirs and normal oil reservoirs, and large burial depth span and high heterogeneity of quasi-layered reservoirs. The complexity in diagenesis and accumulation lead to the unique distribution and enrichment of carbonate reservoirs in the Tazhong area. The analysis of blowdown and leakage depths, heterogeneity, and physical properties of pores, caves and fractures of the Yingshan formation carbonate reservoirs indicates that the interstratal karsts have superimposed with faults and fractures to form fracture zones, so that the reservoir bodies present integrated continuous distribution characteristics spatially, providing favorable conditions for quasi-layered continuous enrichment of oil and gas. During late periods, a massive amount of natural gas had been filled along the gas-source faults. Based on the variations of relative contents of light hydrocarbons and aromatic naphthalene homologs in crude oil, it is found that the quasi-layered continuous carbonate reservoirs in the Tazhong area are different in terms of the properties of oil and gas and the types of oil reservoirs as a result of the formation of high GOR high-yield condensate gas reservoirs near the oil/gas-source faults due to gas washing, migration and fractionation. Late gas charge and transformation process acting on earlier oil reservoirs is an important geochemical action in the formation mechanism of carbonate reservoirs in the Tazhong area.

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Isotopic evidence of TSR origin for natural gas bearing high H2S contents within the Feixianguan Formation of the northeastern Sichuan Basin, southwestern China

Cited by 113 publications

References 20 publications

Hydrolysis of Pyrite: a Possible Pathway for Generation of High Concentrations of H2S Gas in Deep-buried Reservoirs?

Hydrolysis of Pyrite: a Possible Pathway for Generation of High Concentrations of H2S Gas in Deep-buried Reservoirs?

Detection of 2-thiaadamantanes in the oil from Well TZ-83 in Tarim Basin and its geological implication

Characteristics and Accumulation Mechanism of Quasi-Layered Ordovician Carbonate Reservoirs in the Tazhong Area, Tarim Basin

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