Geochemical features and genesis of shale gas in the Jiaoshiba Block of Fuling Shale Gas Field, Chongqing, China

Wei, Xianjun; Guo, Tonglou; Liu, Ruobing

doi:10.1016/j.jnggs.2016.11.005

Cited by 22 publications

(46 citation statements)

References 14 publications

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“…Carbon isotopic composition is also related to ethane Rayleigh Figure 11. Diagram distribution of d 13 C 1 and d 13 C 2 values of shale gases from Changning gas field (a, b), and Fuling gas field (c, d), Sichuan Basin (data sources: Dai et al, 2014aDai et al, , 2016aDai et al, , 2016cLiu, 2015;Wei et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…This phenomenon is also observed for Lower Paleozoic Majiagou gas in western Jingbian in the Ordos Basin (Kong et al, 2016). Thomson, 1987;data sources: Dai et al, 2014adata sources: Dai et al, , 2016adata sources: Dai et al, , 2016cHill et al, 2007;Liu, 2015;Pashin et al, 2012;Stra poć et al, 2010;Tilley and Muehlenbachs, 2013;Wei et al, 2016;Wu et al, 2015;Zumberge et al, 2012). Figure 10 shows that data points of North American shale gas with relatively low maturity coincide with Schoell's maturity trend; carbon and hydrogen isotopes become heavy with maturity.…”

Section: Partial Reversal Of D 13 C 1 >D 13 Cmentioning

confidence: 96%

“…Isotopic variations with thermal maturity from To zone (with typical oil-asscociated gas) and Ms zone (with composition variations caused by shallow migration) to TT (m) zone (with dry oil-asscociated gas originating in marine sapropelic organic matter) are in agreement with kerogen types and thermal evolution. Tilley and Muehlenbachs, 2013;data sources: Dai et al, 2014adata sources: Dai et al, , 2016adata sources: Dai et al, , 2016cLiu, 2015;Wei et al, 2016). Figure 6.…”

Section: Abnormal Carbon and Hydrogen Isotopic Compositionsmentioning

confidence: 99%

“…After more than three periods of hydrocarbon generation and migration in the Longmaxi Formation in the Sichuan Basin, the d 13 C 1 value (À29.2% on the average) for Silurian gas Figure 10. Schoell plot of d 13 C 2 versus C 2 H 6 (a), d 13 C 1 versus CH 4 (b) of shale gases from North America and the Longmaxi shale gas of Sichuan Basin (modified after Burruss and Laughrey, 2010;Thomson, 1987;data sources: Dai et al, 2014adata sources: Dai et al, , 2016adata sources: Dai et al, , 2016cHill et al, 2007;Liu, 2015;Pashin et al, 2012;Stra poć et al, 2010;Tilley and Muehlenbachs, 2013;Wei et al, 2016;Wu et al, 2015;Zumberge et al, 2012).…”

Section: Carbon Isotopic Reversal Caused By High Geotemperaturementioning

confidence: 99%

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Longmaxi shale gas geochemistry in Changning and Fuling gas fields, the Sichuan Basin

Feng

Huang

et al. 2017

Energy Exploration & Exploitation

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This paper focuses on Longmaxi shale gas geochemistry and carbon isotopic reversal in Changning and Fuling gas fields through comparative study of shale gas composition and carbon and hydrogen isotopes in North America and Changning and Fuling gas fields. Longmaxi shale gas in Changning and Fuling gas fields exhibits the features of dry gas. Specifically, the average methane (CH 4) content is 98.72 and 98.17%, respectively. The humidity is less than 0.5%. Nonhydrocarbon gases include a small amount of CO 2 and N 2. Extremely heavy d 13 C 1 value, average d 13 C 2 value of À33.3 and À34.6% for Changning and Fuling, and sapropelic organic matter indicate the properties of petroliferous dry gas. Carbon isotopic reversal, i.e. d 13 C 1 >d 13 C 2 >d 13 C 3 , may be caused by combined secondary effects at high maturity and high geotemperature. The reversal may also be related to ethane Rayleigh fractionation and late methane generation by water and transition metals reaction. Geologic setting in these two gas fields may have an impact on carbon isotopes distribution.

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Section: Discussionmentioning

confidence: 99%

Section: Partial Reversal Of D 13 C 1 >D 13 Cmentioning

confidence: 96%

Section: Abnormal Carbon and Hydrogen Isotopic Compositionsmentioning

confidence: 99%

Section: Carbon Isotopic Reversal Caused By High Geotemperaturementioning

confidence: 99%

See 2 more Smart Citations

Longmaxi shale gas geochemistry in Changning and Fuling gas fields, the Sichuan Basin

Feng

Huang

et al. 2017

Energy Exploration & Exploitation

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“…All 16 samples were analyzed with the Matrix-MG gas analyzer for composition: the 8 gas samples from Jiaoye-1 well were analyzed with the Trace GCULTRA-MAT 253 IRMS gas isotope analyzer for carbon isotope composition and the 8 gas samples from Youye-1 well were analyzed with the same for nitrogen isotope analysis. Some data are quoted from previous studies [38][39][40].…”

Section: Carbon and Nitrogen Isotopic Analysis And Gas Component Diffmentioning

confidence: 99%

Effect of organic maturity on shale gas genesis and pores development: A case study on marine shale in the upper Yangtze region, South China

et al. 2020

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The marine shale in southern China has undergone complex tectonic evolution with a high thermal evolution degree. Excessive thermal evolution brings certain risks to shale gas exploration and development. With the advancement of experimental methods, the evolution process of shale reservoirs can be better understood from the micro-nanoscale. This work takes the Ordovician-Silurian Wufeng and the first member of Longmaxi Formation in the Sichuan Basin and Lower Cambrian Niutitang Formation in Outer Margin of the Sichuan Basin to study the impact of maturity upon the genesis of shale gas and development features of the reservoir. A series of geochemical research methods, including TOC, gas component and gas isotope, were adopted to study the impact of different thermal evolution stages of organic matter upon the genesis of shale gas. The nanoscale micro-imaging technique, such as FIB-SEM and FIB-HIM, was used to analyze the development of OM-hosted pores. As shown from the results, when Ro = 1.2–3.5%, the marine shale gas is dominated by methane and other hydrocarbon gases, since the mixture of cracking gas from liquid hydrocarbons and kerogen-cracking gas cause the carbon isotope reversal. Besides, the pyrobitumen pores characterized by the strong connectivity and storage capacity were primarily developed. When Ro > 3.5%, the organic matter is at the graphitization stage. The shale gas is mainly composed of nitrogen at this stage. The nitrogen is originated from the atmosphere and the thermal evolution process, and the OM-hosted pores (pyrobitumen and kerogen pores) characterized by the bad connectivity and storage capacity are developed. Finally, the main component of shale gas, the genesis of shale gas and the pattern of OM-hosted pores under different thermal evolution stages of organic matter are summarized, which provide technical support for the exploration and development of shale gas.

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Variations of yields and molecular and isotopic compositions in gases generated from Miocene strata of the Carpathian Foredeep (Poland) as determined by hydrous pyrolysis

Kotarba

Bilkiewicz

Bajda

et al. 2022

Int J Earth Sci (Geol Rundsch)

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Geochemical features and genesis of shale gas in the Jiaoshiba Block of Fuling Shale Gas Field, Chongqing, China

Cited by 22 publications

References 14 publications

Longmaxi shale gas geochemistry in Changning and Fuling gas fields, the Sichuan Basin

Longmaxi shale gas geochemistry in Changning and Fuling gas fields, the Sichuan Basin

Effect of organic maturity on shale gas genesis and pores development: A case study on marine shale in the upper Yangtze region, South China

Variations of yields and molecular and isotopic compositions in gases generated from Miocene strata of the Carpathian Foredeep (Poland) as determined by hydrous pyrolysis

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