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Carbon Isotope - DOAJ

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Last Updated: 10 September 2022

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Effect of Methane Cracking on Carbon Isotope Reversal and the Production of Over-Mature Shale Gas

The experimental findings show that CH 4 polymerization is proceeding to CH 4 leading to significant cracking, which is a contributing factor in isotope reversal of over-mature shale gas isotope. During shale gas exploration in the Sichuan Basin, the corresponding amount of mud gas discovered at various depths rises initially, then decreases with increasing depth, and finally declines to zero, with only trace hydrocarbon gas discernable. Therefore, the roughly equal value between u03b4 13 C 1 and u03b4 13 C 2 for over-mature shale gas and very low wetness may have the ability to screen CH4 significant cracking. According to the variation production data with the geochemistry of over-mature shale gas in the Sichuan Basin, China, two geochemical indices leading to CH 4 significant cracking in a geological setting are suggested.

Source link: https://doi.org/10.3390/en15176285


Thermal Imaging Reliability for Estimating Grain Yield and Carbon Isotope Discrimination in Wheat Genotypes: Importance of the Environmental Conditions

Thermal imaging of plant water status and other crop characteristics is a powerful tool to investigate plant water status and estimate other crop traits. In 2011, and 2012, respectively, a series of 384 and a subset of 16 genotypes of spring bread wheat were tested in two Mediterranean-climate sites under water stress and full irrigation conditions. The typical GY, u0394-13 C, and SDD of wheat genotypes growing in ten environments were more associated with changes in VPDmax and Tmax than with the SWC, according to WS.

Source link: https://doi.org/10.3390/s19122676


Stable carbon isotope stratigraphy of the Silurian in the Jočionys-299 borehole (eastern Lithuania)

Stable carbon isotopes have been used in solving stratigraphic problems in the Silurian for more than 30 years. New u00ce&u00b413C data from the Silurian section of the Jou00f6-Dionys-299 borehole, which is located in eastern Lithuania, is presented in this paper. The Ireviken CIE is traced to the upper regions of the venu005dionys Formation and the Pagobé Formation, the Jo-u008dionys Formation, and the Verknu007 Formation. We can better match eastern Lithuanian lithostratigraphic units with the global Silurian Geochronological Scale more accurately thanks to chemistry and biostratigraphic results.

Source link: https://doi.org/10.3176/earth.2022.09


Constrain on Oil Recovery Stage during Oil Shale Subcritical Water Extraction Process Based on Carbon Isotope Fractionation Character

Huadian oil shale was extracted by subcritical water at 365 b0C in this work to better understand the carbon isotope fractionation process and how to use its fractionation characteristics to limit the oil recovery stage during oil extraction in situ exploitation. The carbon isotopes of the hydrocarbon gases exhibit a regular pattern, with no u201d and u201d events occurring, along with no u201d and u201d events, nor is it a coincidence that any chemical nor carbon isotopes reach equilibrium in the C-H-O system, as shown by the CO 2 -CO diagram. The decomposition of organic matter is mostly due to decomposition kinetics, and thermodynamic equilibrium processes are limited; when entering the oil production zone, the effect of the carbon isotope thermodynamic equilibrium process becomes more significant than kinetics, and kinetics is more relevant than kinetics; when entering the oil production zone exceeds maximum oil generation capacity.

Source link: https://doi.org/10.3390/en14237839


A bio- and chemostratigraphic search for the Mid-Ludfordian Carbon Isotope Excursion interval in the Ludlow of the Ohesaare core, Estonia

Despite several sedimentary differences occurring in the Ludlow period in particular, researchers have been enticed to share various theories about Silurian stratigraphy in the East Baltic for years. the Mid-Ludfordian Carbon Isotope Excursion, one of the few events in Palaeozoic history of carbon isotopes, has been removed from the Ohesaare record, which is partially accompanied by the Lau biotic and oceanic events. The first findings indicate a lack of MLCIE within the Torch Formation's uppermost layer, which could be a possibility for the missing MLCIE. We compared the fossil distribution pattern in Ohesaare to that on Gotland and in Kurzeme, as well as U00ceUCu00b413C results from the Uddvide and Ventspils core sections in order to prove this. According to both Baltic and Bohemian results, the MLCIE is located beneath the Ozarkodinacrispa conodont Biozone.

Source link: https://doi.org/10.3176/earth.2022.04


Miaolingian (Cambrian) trilobite biostratigraphy and carbon isotope chemostratigraphy in the Tingskullen drill core, Öland, Sweden

The Cambrian sequence of the Tingskullen drill core from northern u00c3u0096land contains Cambrian Series 2 and Miaolingian siliciclastic strata. The Wuliugan Excursion curve along the Borgholm Formation shows a general upward trend upwards along the Borgholm Formation without any notable excursions, indicating that the Wuliuan Acadoburdon of the Wuliu Young Cambrian boundary is younger than the normal A00e2u0090s2u0099 u0099B5B0099 zone of tinction is older than the negative Redlichid oe2u0000e2u00e20802u00e Extintinc Extin the ootintin o ou00e Extintintintin ooe Extintu00e Excursion of the Wuliootin the Borg'u00e Extintu00e Extintintin the U00e Extintintintin the e2u0090e2u00e2u00e2u00e2u00e2u.

Source link: https://doi.org/10.3176/earth.2021.03


Turkey oak (Quercus cerris L.) is more drought tolerant and better reflects climate variations compared to pedunculate oak (Quercus robur L.) in lowland mixed forests in northwestern Serbia: A stable carbon isotope ratio (δ13C) and radial growth approach

When using TRW or u03b413C, we focused on the species' responses to measured meteorological data, drought events reported by six meteorological drought indices, and river water level to help them understand their drought tolerance and stress and monitoring their species response to climate and drought indices. The Palmer drought severity index had the most significant effect on TRW and u03b413C, according to a generalized additive mixed model among the six drought indices tested, based on the optimalised precipitation evapotranspiration index and the standardised precipitation index gave the best fit for both TRW and u03b413C.

Source link: https://doi.org/10.1016/j.ecolind.2022.109242

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions