High temperature simulation of petroleum formation—IV. Stable carbon isotope studies of gaseous hydrocarbons

McCarty, Harry B.; Felbeck, George T.

doi:10.1016/0146-6380(86)90068-9

Cited by 20 publications

(10 citation statements)

References 18 publications

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“…Initially equilibrium isotope effects (EIBs) had been proposed to explain the distribution of carbon isotopes in thermogenic hydrocarbons, most notably by Galimov and Petersil'ye (1967), Galimov and Ivlev (1973), and Galimov (1973), but Galimov (1985) has modified this equilibrium effect to a "thermodynamically ordered distribution," which is more consistent with the accepted view that kinetic isotope effects (KIEs) control the redistribution of isotopes (see for carbon : Sackett, 1968;Stahl, 1973;McCarty and Felbeck, 1986;Chung et aI., 1988;and for hydrogen: Frank, 1972). For thermogenic hydrocarbon formation, kinetic isotope theory predicts that the light hydrocarbon formed by the saturation of an alkyl group cleaved from the kerogen molecule will be depleted in the heavier isotope relative to the remaining reactive kerogen.…”

Section: L---------------mentioning

confidence: 58%

Stable Isotopes and Global Budgets

Whiticar

1993

Atmospheric Methane: Sources, Sinks, and Role in Global Change

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Section: L---------------mentioning

confidence: 58%

Stable Isotopes and Global Budgets

Whiticar

1993

Atmospheric Methane: Sources, Sinks, and Role in Global Change

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“…Biogenic (microbial or thermogenic) hydrocarbons are usually generated from complex hydrocarbons and their carbon isotope ratios usually increase with increasing carbon number (methane δ 13 C < ethane δ 13 C < propane δ 13 C; McCarty & Felbeck 1986; Chung et al. 1988).…”

Section: Resultsmentioning

confidence: 99%

Characterization of natural gases in Japan based on molecular and carbon isotope compositions

Waseda

Iwano

2008

Geofluids

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In this paper, the origin, maturity, migration, biodegradation and mixing of natural hydrocarbon gases in Japan have been interpreted using molecular and carbon isotope compositions. No indications of abiogenic gases have been found, the gases being classified as microbial, thermogenic or mixed microbial ⁄ thermogenic. However, secondary alteration (mixing, biodegradation, fractionation in migration processes) has had a major but variable impact on the composition of natural gases. Biodegradation, especially, has altered both molecular and isotopic signatures. Thus, the prime control of isotopic and molecular characteristics in gases is due to genetic phenomena, but secondary effects must be taken into account when attempting to understand the origin and distribution of gas. Where the extent of secondary alteration is small, carbon isotope compositions of thermogenic hydrocarbons are controlled largely by maturity. An isotope model developed by Berner and Faber was applied successfully to natural gases in northeast Japan. Besides maturity estimation, the application of the model enables detection of biodegradation, mixing between microbial and thermogenic gases, and mixing among gases with different maturities. The carbon isotope compositions of carbon dioxide also provide information for their genetic origins.

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“…During the thermal degradation process, because of the weakly bond of 12 Ce 12 C, the breaking of 12 Ce 12 C bond occurs earlier than 12 Ce 13 C bond. Thus, the lighter carbon isotope ( 12 C) has a priority to get into the alkane gas, which results in the increase of carbon amounts in alkane gas and the normal carbon isotopic distribution pattern among the C 1 eC 4 alkanes (d 13 C 1 <d 13 C 2 <d 13 C 3 <d 13 C 4 ) (Schoell, 1983;James, 1983;McCarty and Felbeck, 1986;Pernaton et al, 1996). However, in , 1997;Lv et al, 2006).…”

Section: Analysis Of the Carbon Isotope Characteristics And Identificmentioning

confidence: 90%