Journal ArticleDOI
Isotopically light methane in natural gas: bacterial imprint or diffusive fractionation?
Alain Prinzhofer,Éric Pernaton +1 more
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In this paper, the authors consider that both explanations for isotopically light methane (bacterial generation or migration fractionation) are realistic and use a simple diagram (ethane over methane versus the carbon isotopic ratio of methane), and modelling the two discussed processes (mixing of bacterial and thermal gas, or diffusion of thermal gases) to decipher the origin of the gas series.About:
This article is published in Chemical Geology.The article was published on 1997-10-22. It has received 216 citations till now. The article focuses on the topics: Methane & Natural gas.read more
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Mathematical modeling of stable carbon isotope ratios in natural gases
TL;DR: In this article, a new approach is presented for mathematical modeling of stable carbon isotope ratios in hydrocarbon gases based on both theoretical and experimental data. The kinetic model uses a set of parallel first-order gas generation reactions in which the relative cracking rates of isotopically substituted (k∗) and unsubstituted (k) bonds are represented by the equation k∗/k=(A f ∗/A f ) exp(−ΔEa/RT), where R is the gas constant and T is temperature.
Journal ArticleDOI
Tracing Fluid Origin, Transport and Interaction in the Crust
TL;DR: In this article, the general concepts behind using noble gases as a tracer of crustal fluid processes and illustrate these concepts with examples applied to oil-gas-ground-water systems, mineralizing fluids, hydrothermal systems and ancient ground-waters.
Journal ArticleDOI
Isotope organic geochemistry
TL;DR: The present-day state as well as the history of isotope organic geochemistry is reviewed in this article, where theoretical aspects of fractionation in a system of complex organic molecules, fractionation of carbon isotopes in the biosphere, isotopes as applied to study the transformation of organic matter, geochemistry of oil and gas, evolution of the carbonate-organic carbon system and aspects of astrobiology are considered.
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Experimental investigation on the carbon isotope fractionation of methane during gas migration by diffusion through sedimentary rocks at elevated temperature and pressure
Tongwei Zhang,Bernhard M. Krooss +1 more
TL;DR: In this paper, the authors quantify the diffusive isotope fractionation effect and its dependence on total organic carbon (TOC) content, experimental measurements have been performed on three natural shale samples with TOC values ranging from 0.3 to 5.74%.
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Isotope fractionation of methane during natural gas flow with coupled diffusion and adsorption/desorption
Xinyu Xia,Yongchun Tang +1 more
TL;DR: In this article, a continuum flow model with coupled adsorption/desorption and diffusion is defined and calibrated to describe isotope fractionation of natural gas due to flux in low permeability rocks.
References
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Book
The mathematics of diffusion
TL;DR: Though it incorporates much new material, this new edition preserves the general character of the book in providing a collection of solutions of the equations of diffusion and describing how these solutions may be obtained.
Journal ArticleDOI
The hydrogen and carbon isotopic composition of methane from natural gases of various origins
TL;DR: The deuterium concentrations (δD vs SMOW) of biogenic methanes from world-wide occurrences range from −180 to −280% and were found to be depleted in deutrium by approx. 160%.
Journal ArticleDOI
Genetic characterization of natural gases
TL;DR: In this article, compositional fields have been defined for primary gases (biogenic, thermogenic associated, and thermogenic nonassociated) and for gases which result from mixing of these gases.
Journal ArticleDOI
On the isotopic composition of carbon in soil carbon dioxide
TL;DR: In this paper, the isotopic composition of carbon in soil CO2 differs from that of CO2 in soil-respired CO2, which is very close to the theoretical difference of 4.4%.
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Carbon and hydrogen isotope systematics of bacterial formation and oxidation of methane
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