New indexes and charts for genesis identification of multiple natural gases

Li, Jian; Li, Zhisheng; Wang, Xiaobo; Wang, Dongliang; Xie, Zengye; Jin, Li; Wang, Yifeng; Han, Zhongxi; Ma, Chenghua; Wang, Zhihong; Cui, Huiying; Wang, Rong; Hao, Aisheng

doi:10.1016/s1876-3804(17)30062-9

Cited by 50 publications

(15 citation statements)

References 19 publications

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“…Helium isotopic compositions have been widely used to trace the mantle-derived volatiles (Wakita and Sano, 1983;Oxburgh et al, 1986;Poreda et al, 1988;Xu et al, 1997). It is commonly considered that R/Ra >1 suggests the input of considerable mantle-derived helium, whereas R/Ra ≤0.1 implies typical crustal helium (Xu et al, 1998;Li et al, 2017;Chen et al, 2021).…”

Section: Origin Of Heliummentioning

confidence: 99%

“…Helium Relationship With Argon and Neon Isotopes Li et al (2017) have proposed a diagram of 3 He/ 4 He versus 40 Ar/ 36 Ar to identify gases of crustal and mantle origins, which determines different participation degrees of mantle-derived components according to the 3 He/ 4 He ratios (Figure 6). The natural gas from Subei Basin generally has a higher 3 He/ 4 He ratio than the air, i.e., R/Ra >1, suggesting the mixed crust-mantle origin with considerable mantle helium (Figure 6).…”

Section: Origin Of Heliummentioning

confidence: 99%

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Geochemical Characteristics of Helium in Natural Gas From the Daniudi Gas Field, Ordos Basin, Central China

Liu

Jia

et al. 2022

Front. Earth Sci.

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Helium-bearing gas is accumulated in the Lower Ordovician, Upper Carboniferous, and Lower Permian reservoirs of the Daniudi gas field in Ordos Basin, and the helium concentrations and isotopic compositions are investigated in order to reveal the abundance and origin of helium. Geochemical characteristics indicate that the natural gas from the Daniudi gas field has helium concentrations of 0.0271–0.1273%, with R/Ra ratios of 0.007–0.072. The 4He/20Ne ratios range from 848 to 17,000, which are substantially higher than the ratio of air or air saturated water. The proved helium reserves of the Daniudi gas field exceed 100 × 106 m3, suggesting an extra-large helium gas field. Helium in the field is of crustal origin and derived from the radioactive decay of U and Th in the rocks and minerals, with no significant contribution by atmospheric or mantle-derived helium. The natural gas in the Daniudi gas field displays the characteristics of typical crustal helium, which is consistent with the gases from cratonic basins (Ordos, Sichuan, and Tarim) in China, whereas the gases from rift basins (Songliao, Bohai Bay, and Subei) have experienced a significant addition of mantle-derived helium.

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Section: Origin Of Heliummentioning

confidence: 99%

Section: Origin Of Heliummentioning

confidence: 99%

Geochemical Characteristics of Helium in Natural Gas From the Daniudi Gas Field, Ordos Basin, Central China

Liu

Jia

et al. 2022

Front. Earth Sci.

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“…Natural gas in the marine strata of the Sichuan Basin is predominantly composed of oil-cracking gas (Hao et al, 2008;Liu et al, 2012;Liu et al, 2013;Liu et al, 2014). Theoretical and experimental studies indicate that kerogen cracking gas and oil cracking gas follow different evolution trends in the correlation diagram between ln (C 2 /C 3 ) and ln (C 1 /C 2 ) values (Prinzhofer and Huc, 1995;Li et al, 2017). The Chuanxi T 2 l 4 oil-associated gas displays the characteristics of oil cracking gas (Wu et al, 2020b), whereas the coal-derived gas from the Zhongba and Qiongxi T 3 x 2 and Xinchang T 3 x 5 reservoirs primarily follows the trend of kerogen cracking gas (Figure 7).…”

Section: Genetic Types Of Natural Gasmentioning

confidence: 99%

“…FIGURE 7 |The cross-plot of ln (C 2 /C 3 ) versus ln (C 1 /C 2 ) of the T 3 x 2 gas from the Western Sichuan Depression (modified afterLi et al, 2017).…”

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confidence: 99%

Geochemical Characteristics and Origin of Tight Gas in Member Two of the Upper Triassic Xujiahe Formation in Western Sichuan Depression, Sichuan Basin, SW China

Liu

Chen

et al. 2022

Front. Earth Sci.

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Natural gas in the tight sandstone reservoirs in Member two of the Upper Triassic Xujiahe Formation in the Western Sichuan Depression of the Sichuan Basin has complex geochemical characteristics, and the origin and source of the tight gas are revealed based on the geochemical analysis and comparison in this study. The tight gas has the dryness coefficient of 0.950–0.994, which is positively correlated with the CH4 content. The gaseous alkanes display positive carbon isotopic series, with the δ13C1 and δ13C2 values ranging from −35.6‰ to −30.3‰ and from −29.1‰ to −21.0‰, respectively, and the δD1 values range from −176‰ to −155‰. Genetic identification based on the carbon and hydrogen isotopic compositions indicates that a small amount of tight gas is typically coal-derived gas, whereas most of the tight-gas samples have experienced mixing by oil-associated gas. Geochemical comparisons suggest that the tight gas displays distinct differences with the typical oil-associated gas in Member four of the Middle Triassic Leikoupo Formation in the Chuanxi gas field and the typical coal-derived gas in Member five of Xujiahe Formation in the Xinchang gas field. It is also apparently different from the typical coal-derived gas in Member two of Xujiahe Formation in both Zhongba and Qiongxi gas fields. Among the tight gas in Member two of the Xujiahe Formation from the Western Sichuan Depression, the coal-derived gas is generated mainly by the humic mudstone in the Upper Triassic Ma’antang and Xiaotangzi formations, with assistance of the humic mudstone in Member two of the Xujiahe Formation, whereas the oil-associated gas is derived from the sapropelic limestone in the Ma’antang Formation.

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“…За даними (Li et al, 2017), які спираються на дослідження масиву фактичного матеріалу, співвідношення метану, етану та пропану у викопних газах утворюють певні області значень, які віддзеркалюють первинний матеріал, з якого утворювався газ. Точніше було б сказати, що це індикатор шляху походження, адже газ, що утворився при деструкції нафти, є вторинним (Тиссо, Вельте, 1981).…”

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Kerogen amount calculation required for the formation of hydrocarbon deposits in the Western oil and gas region of Ukraine

Khokha¹,

Lyubchak²,

Yakovenko³

et al. 2020

ggcm

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This paper considers the issue of determining the maximum hydrocarbons amount that can be generated by kerogen using thermodynamic methods. It is shown that the chemical composition of natural gas or gas condensate contains information about the generative capacity of kerogen from which it was formed. Based on experiments of type II and I kerogen pyrolysis and thermodynamic calculations by entropy maximization method, we propose a new method for determining the amount of kerogen from which gas was formed, which contains 1 dm3 of methane at a given ratio of butane isomers. The obtained data are interpreted as an indicator of kerogen maturity in the context of the depth of its destruction. This method is applied to theWestern oil and gas region of Ukraine hydrocarbon deposits. The analysis of kerogen transformations in the region sedimentary strata, using criteria of the GASTAR diagram, is carried out. We assessed the trends of kerogen conversion in the region in the areas of “maturity” and “biodegradation” in the ratio of ethane/propane (C2/C3) to ethane/isobutane (C2/i-C4). It is shown that the majority of deposits in the Western oil and gas region developed in the direction of maturation and only a small group of gas deposits – biodegradation. To establish the gases genesis in the region, we built a graph of the two geochemical indicators dependence – the methane/ethane ratio (C1/C2) and ethane/propane ratio (C2/C3). It is shown that some of the gas fields is formed due to the conversion of organic material of oil deposits. At the same time, gas condensate fields in the region, with few exceptions, are formed due to the primary destruction of kerogen. Based on the results of the calculations, maps of the methane (generated by type II kerogen) amount distribution were constructed. It is established that kerogen, which was the source material for hydrocarbon deposits of Boryslav-Pokuts oil and gas region, has practically exhausted its gas generation potential. Instead, kerogen from gas and gas condensate fields in the Bilche-Volytska oil and gas district still retains the potential to generate hydrocarbons.

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New indexes and charts for genesis identification of multiple natural gases

Cited by 50 publications

References 19 publications

Geochemical Characteristics of Helium in Natural Gas From the Daniudi Gas Field, Ordos Basin, Central China

Geochemical Characteristics of Helium in Natural Gas From the Daniudi Gas Field, Ordos Basin, Central China

Geochemical Characteristics and Origin of Tight Gas in Member Two of the Upper Triassic Xujiahe Formation in Western Sichuan Depression, Sichuan Basin, SW China

Kerogen amount calculation required for the formation of hydrocarbon deposits in the Western oil and gas region of Ukraine

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