Geochemistry and occurrence of inorganic gas accumulations in Chinese sedimentary basins

Dai, Jiajun; Yang, Shufeng; Chen, Hanlin; Shen, Xiaohua

doi:10.1016/j.orggeochem.2005.08.007

Cited by 117 publications

(73 citation statements)

References 15 publications

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“…Furthermore, desorption which was initiated by the uplift of the coal seams during the last 42 million years may also have led to an enrichment of 13 C, as 12 C rich compounds are more mobile then 13 C-compounds. Hence, both bacterial oxidation and desorption can be considered for the reason of unusually heavy ethane, which is also observed in some other coal basins (Thielemann et al, 2004;Dai et al, 2005;Zou et al, 2006). It is inferred that isotopically lighter ethane formed by secondary bacterial gas generation is overwhelmed by heavier ethane, formed by bacterial oxidation and desorption processes.…”

Section: Discussionmentioning

confidence: 80%

Origin and secondary alteration of coalbed and adjacent rock gases in the Zonguldak Basin, western Black Sea Turkey

Hoşgörmez

2007

Geochem. J.

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Section: Discussionmentioning

confidence: 80%

Origin and secondary alteration of coalbed and adjacent rock gases in the Zonguldak Basin, western Black Sea Turkey

Hoşgörmez

2007

Geochem. J.

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“…On the base of geochemical statistics of recognized abiogenic gas compositions, enriched δ 13 C value for CH 4 , reversed isotopic trend in 13 C with increasing carbon number, and a high 3 He/ 4 He ratio, are commonly considered to be indicative of the occurrence of abiogenic hydrocarbons (Dai et al, 2005;2008;2009a;Jenden et al, 1993a;Sherwood Lollar et al, 2002;. Abiogenic gases are isotopically heavier than biogenic origin gases, however, there is no definitive threshold of isotopic value of methane between biogenic and abiogenic origin.…”

Section: Discussion About the Origin Of Hydrocarbon Gases In Deep Laymentioning

confidence: 99%

“…So, some researchers suggested that reversal pattern of carbon isotopic of natural gases is for their abiogenic genesis (Guo et al, 1997;Dai et al, 2005;2008;Jin et al, 2009;Ni and Dai, 2009;Wang et al, 2009). However, some investigations believed that gas pooled in volcanic rocks are biogenic origin since sedimentary organic matters are fully involved, the reversed pattern of carbon isotope of hydrocarbon gases is caused by all kinds of epigenesises, such as mixing of between organic gases from different source rocks and some abiogenic hydrocarbon gases from the mantle or transudation (Li et al, 1999;Huang et al, 2004;Feng 2008;Luo et al, 2009).…”

Section: Backgrounds About Deep Gases Originmentioning

confidence: 99%

“…However, abiogenic methane is frequently found in certain regimes such as oceanic mid-ridges, mud volcanoes and areas adjacent to abyssal fault zones (Abrajano et al, 1988;Charlou et al, 2002;Hosgormez et al, 2005). These abiogenic natural gases generally show a reversal pattern of carbon isotopic values for methane and their molecular homologues (i.e., 13 C 1 > 13 C 2 > 13 C 3 > 13 C 4 , Des Marais et al, 1981;Jenden et al, 1993a;Dai et al, 2005;Sherwood Lollar et al, 2002;2008). Abiogenic natural gases were thought forming by Fischer-Tropsch Synthesis (FTS) under subsurface ( Hu et al, 1998;Horita and Berndt, 1999;Sherwood Lollar et al, 2002Fiebig et al, 2007;Fu et al, 2007;Taran et al, 2007Taran et al, , 2010Proskurowski et al, 2008, Proskurowsk, 2010 or by water-rock interaction under the crust (Anderson et al, 1984;Douglas and Seyfried, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…More recent studies, however, have shown that such "carbon isotopic reversals" can in fact be produced in typical thermogenic hydrocarbon deposits (Du et al, 2003;Huang et al, 2004). Moreover, the gases with reversed pattern of carbon isotope are also found in some deposits basin (Dai et al, 2005). So, the formation mechanisms for the most of gases with inverse trends of carbon isotope, especially this kind of gases found in sediment basin, still remain controversial.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fischer–Tropsch Synthesis Conducted in Volcanic Reservoir Stone, An Important Factor Caused a Reversed Pattern of Carbon Isotopic for Natural Gases Developed in Deep Layers, Songliao Basin North East China

Zhang

et al. 2013

Energy Exploration & Exploitation

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AbstractsTwo types of experiments of source rocks pyrolysis with volcanic reservoir rock and without one were conducted under hydrothermal condition and at 200 ˚C in gold tube system. The experiments result shows that there is a higher concentration of hydrocarbon gases generated in the experiment with rhyolite of reservoir stone and water than that with only water. Moreover, the hydrocarbon gases generated by experiments with rhyolite show a full reserved pattern of carbon isotope. This indicated that the FST reaction could happened between source rocks and volcanic reservoir rock at relatively low temperature.The numerical calculation for the carbon isotope of the gases from mixture between the gases from our FTS experiments and the typical organic hydrocarbon gases from deep layers of Songliao basin show that the contamination of a little FTS gas (<5% ,v/v) could cause the carbon isotope composition of thermal gases great variation. So, Fischer-Tropsch synthesis conducted in volcanic reservoir stone is an un-negligible factor caused the reversed pattern of carbon isotopic for natural gases developed in deep layers, Songliao Basin. This also indicated that the natural gases in deep layers of the basin are organic origin chiefly.

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Abiotic Methane on Earth

Etiope

Lollar

2013

Reviews of Geophysics

500

437

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[1] Over the last 30 years, geochemical research has demonstrated that abiotic methane (CH 4 ), formed by chemical reactions which do not directly involve organic matter, occurs on Earth in several specific geologic environments. It can be produced by either high-temperature magmatic processes in volcanic and geothermal areas, or via low-temperature (<100 C) gas-water-rock reactions in continental settings, even at shallow depths. The isotopic composition of C and H is a first step in distinguishing abiotic from biotic (including either microbial or thermogenic) CH 4 . Herein we demonstrate that integrated geochemical diagnostic techniques, based on molecular composition of associated gases, noble gas isotopes, mixing models, and a detailed knowledge of the geologic and hydrogeologic context are necessary to confirm the occurrence of abiotic CH 4 in natural gases, which are frequently mixtures of multiple sources. Although it has been traditionally assumed that abiotic CH 4 is mainly related to mantle-derived or magmatic processes, a new generation of data is showing that low-temperature synthesis related to gas-water-rock reactions is more common than previously thought. This paper reviews the major sources of abiotic CH 4 and the primary approaches for differentiating abiotic from biotic CH 4, including novel potential tools such as clumped isotope geochemistry. A diagnostic approach for differentiation is proposed.

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Geochemistry and occurrence of inorganic gas accumulations in Chinese sedimentary basins

Cited by 117 publications

References 15 publications

Origin and secondary alteration of coalbed and adjacent rock gases in the Zonguldak Basin, western Black Sea Turkey

Origin and secondary alteration of coalbed and adjacent rock gases in the Zonguldak Basin, western Black Sea Turkey

Fischer–Tropsch Synthesis Conducted in Volcanic Reservoir Stone, An Important Factor Caused a Reversed Pattern of Carbon Isotopic for Natural Gases Developed in Deep Layers, Songliao Basin North East China

Abiotic Methane on Earth

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