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Shipeng Huang - One of the best experts on this subject based on the ideXlab platform.
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stable Carbon Isotopes of coal derived gases sourced from the mesozoic coal measures in china
Organic Geochemistry, 2014Co-Authors: Deyu Gong, Shipeng Huang, Yunyan Ni, Wei WuAbstract:Coal-derived, large scale gas fields derived from the Mesozoic coal measures in China are mainly distributed in the Middle–Lower Jurassic coal measures in the Tarim, Junggar and Turpan-Hami basins in northwest China, and the Upper Triassic Xujiahe Formation coal measure in Sichuan Basin, central China. In 2011, the annual production was 21.6 × 109 m3 and the proved geological reserves were 2485 × 109 m3, accounting for 21% and 30% of the total in China, respectively. Based on analyses of gas composition and stable Carbon Isotopes ratios of 203 samples and stable Carbon Isotopes of 102 CO2 samples, the following conclusions were made. (a) Based on diagnostic plots using the stable Carbon isotopic and molecular composition of gas samples, alkane gas from the Mesozoic coal measures in China is shown to be coal-derived. (b) According to the δ13C2 vs. C2H6 plot of a great number of oil-derived and coal-derived gases in China, it is concluded that gases with δ13C2 > −28.5‰ are coal-derived and those with δ13C2 < −28.5‰ are oil-derived in most cases. (c) Among the natural gases from the Mesozoic coal measures in China, primary coal-derived gases with normal Carbon isotopic distribution pattern among the C1–C4 alkanes (i.e. δ13C1 < δ13C2 < δ13C3 < δ13C4) are dominant. (d) Carbon isotopic pattern reversal mainly results from the mixing of coal-derived gases having different maturities but the same source and secondly from microbial oxidation of propane (e.g. Mu 3 and Mu 4 wells in the Gumudi gas field, Junggar Basin). (e) CO2 in the coal-derived gases from the Mesozoic coal measures in China has both biogenic and abiogenic origins. The biogenic origin is dominant and the abiogenic CO2 is mainly found in the Kuqa Depression in the Tarim Basin and western Sichuan Basin. (f) Isotopic differences between heavy hydroCarbon gases and methane become less with increasing maturity.
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stable Carbon Isotopes of coal derived gases sourced from the mesozoic coal measures in china
Organic Geochemistry, 2014Co-Authors: Jinxing Dai, Deyu Gong, Shipeng HuangAbstract:Abstract Coal-derived, large scale gas fields derived from the Mesozoic coal measures in China are mainly distributed in the Middle–Lower Jurassic coal measures in the Tarim, Junggar and Turpan-Hami basins in northwest China, and the Upper Triassic Xujiahe Formation coal measure in Sichuan Basin, central China. In 2011, the annual production was 21.6 × 109 m3 and the proved geological reserves were 2485 × 109 m3, accounting for 21% and 30% of the total in China, respectively. Based on analyses of gas composition and stable Carbon Isotopes ratios of 203 samples and stable Carbon Isotopes of 102 CO2 samples, the following conclusions were made. (a) Based on diagnostic plots using the stable Carbon isotopic and molecular composition of gas samples, alkane gas from the Mesozoic coal measures in China is shown to be coal-derived. (b) According to the δ13C2 vs. C2H6 plot of a great number of oil-derived and coal-derived gases in China, it is concluded that gases with δ13C2 > −28.5‰ are coal-derived and those with δ13C2
Martin Nowak - One of the best experts on this subject based on the ideXlab platform.
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Carbon Isotopes of dissolved inorganic Carbon reflect utilization of different Carbon sources by microbial communities in two limestone aquifer assemblages
Hydrology and Earth System Sciences, 2016Co-Authors: Martin Nowak, Valerie F Schwab, Cassandre Sara Lazar, Thomas Behrendt, Bernd Kohlhepp, Kai Uwe Totsche, Kirsten Kusel, Susan E TrumboreAbstract:Abstract. Isotopes of dissolved inorganic Carbon (DIC) are used to indicate both transit times and biogeochemical evolution of groundwaters. These signals can be complicated in Carbonate aquifers, as both abiotic (i.e., Carbonate equilibria) and biotic factors influence the δ13C and 14C of DIC. We applied a novel graphical method for tracking changes in the δ13C and 14C of DIC in two distinct aquifer complexes identified in the Hainich Critical Zone Exploratory (CZE), a platform to study how water transport links surface and shallow groundwaters in limestone and marlstone rocks in central Germany. For more quantitative estimates of contributions of different biotic and abiotic Carbon sources to the DIC pool, we used the NETPATH geochemical modeling program, which accounts for changes in dissolved ions in addition to C Isotopes. Although water residence times in the Hainich CZE aquifers based on hydrogeology are relatively short (years or less), DIC Isotopes in the shallow, mostly anoxic, aquifer assemblage (HTU) were depleted in 14C compared to a deeper, oxic, aquifer complex (HTL). Carbon Isotopes and chemical changes in the deeper HTL wells could be explained by interaction of recharge waters equilibrated with post-bomb 14C sources with Carbonates. However, oxygen depletion and δ13C and 14C values of DIC below those expected from the processes of Carbonate equilibrium alone indicate considerably different biogeochemical evolution of waters in the upper aquifer assemblage (HTU wells). Changes in 14C and 13C in the upper aquifer complexes result from a number of biotic and abiotic processes, including oxidation of 14C-depleted OM derived from recycled microbial Carbon and sedimentary organic matter as well as water–rock interactions. The microbial pathways inferred from DIC isotope shifts and changes in water chemistry in the HTU wells were supported by comparison with in situ microbial community structure based on 16S rRNA analyses. Our findings demonstrate the large variation in the importance of biotic as well as abiotic controls on 13C and 14C of DIC in closely related aquifer assemblages. Further, they support the importance of subsurface-derived Carbon sources like DIC for chemolithoautotrophic microorganisms as well as rock-derived organic matter for supporting heterotrophic groundwater microbial communities and indicate that even shallow aquifers have microbial communities that use a variety of subsurface-derived Carbon sources.
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Carbon Isotopes of dissolved inorganic Carbon reflect utilization of different Carbon sources by microbial communities in two limestone aquifer assemblages
Hydrology and Earth System Sciences, 2016Co-Authors: Martin Nowak, Valerie F Schwab, Cassandre Sara Lazar, Thomas Behrendt, Bernd Kohlhepp, Kai Uwe Totsche, Kirsten Kusel, Susan E TrumboreAbstract:Isotopes of dissolved inorganic Carbon (DIC) are used to indicate both transit times and biogeochemical evolution of groundwaters. These signals can be complicated in Carbonate aquifers, as both abiotic (i.e. Carbonate equilibria) and biotic factors influence δ 13 C and 14 C of DIC. We applied a novel graphical method for tracking changes in δ 13 C and 14 C of DIC in two distinct aquifer complexes identified in the Hainich Critical Zone Exploratory (CZE), a platform to study how water transport links surface and shallow groundwaters in limestone and marlstone rocks in central Germany. For more quantitative estimates of contributions of different biotic and abiotic Carbon sources to the DIC pool, we used the geochemical modelling program NETPATH, which accounts for changes in dissolved ions in addition to C Isotopes. Although water residence times in the Hainich CZE aquifers based on hydrogeology are relatively short (years or less), DIC Isotopes in the shallow, mostly anoxic, aquifer assemblage (HTU) were depleted in 14 C compared to a deeper, oxic, aquifer complex (HTL). Carbon Isotopes and chemical changes in the deeper HTL wells could be explained by interaction of recharge waters equilibrated with post-bomb 14 C sources with Carbonates. However, oxygen depletion and δ 13 C and 14 C values of DIC below those expected from the processes of Carbonate equilibrium alone indicate dramatically different biogeochemical evolution of waters in the upper aquifer assemblage (HTU wells). Changes of 14 C and 13 C in the upper aquifer complexes result from a number of biotic and abiotic processes, including oxidation of 14 C depleted OM derived from recycled microbial Carbon and sedimentary organic matter as well as water rock interactions. The microbial pathways inferred from DIC isotope shifts and changes in water chemistry in the HTU wells were supported by comparison with in situ microbial community structure based on 16S rRNA analyses. Our findings demonstrate the large variation in the importance of biotic as well as abiotic controls on 13 C and 14 C of DIC in closely related aquifer assemblages. Further, they support the importance of subsurface derived Carbon sources like DIC for chemolithoautotrophic microorganisms as well as rock-derived organic matter for supporting heterotrophic groundwater microbial communities and indicate that even shallow aquifers have microbial communities that use a variety of subsurface derived Carbon sources.
Susan E Trumbore - One of the best experts on this subject based on the ideXlab platform.
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Carbon Isotopes of dissolved inorganic Carbon reflect utilization of different Carbon sources by microbial communities in two limestone aquifer assemblages
Hydrology and Earth System Sciences, 2016Co-Authors: Martin Nowak, Valerie F Schwab, Cassandre Sara Lazar, Thomas Behrendt, Bernd Kohlhepp, Kai Uwe Totsche, Kirsten Kusel, Susan E TrumboreAbstract:Abstract. Isotopes of dissolved inorganic Carbon (DIC) are used to indicate both transit times and biogeochemical evolution of groundwaters. These signals can be complicated in Carbonate aquifers, as both abiotic (i.e., Carbonate equilibria) and biotic factors influence the δ13C and 14C of DIC. We applied a novel graphical method for tracking changes in the δ13C and 14C of DIC in two distinct aquifer complexes identified in the Hainich Critical Zone Exploratory (CZE), a platform to study how water transport links surface and shallow groundwaters in limestone and marlstone rocks in central Germany. For more quantitative estimates of contributions of different biotic and abiotic Carbon sources to the DIC pool, we used the NETPATH geochemical modeling program, which accounts for changes in dissolved ions in addition to C Isotopes. Although water residence times in the Hainich CZE aquifers based on hydrogeology are relatively short (years or less), DIC Isotopes in the shallow, mostly anoxic, aquifer assemblage (HTU) were depleted in 14C compared to a deeper, oxic, aquifer complex (HTL). Carbon Isotopes and chemical changes in the deeper HTL wells could be explained by interaction of recharge waters equilibrated with post-bomb 14C sources with Carbonates. However, oxygen depletion and δ13C and 14C values of DIC below those expected from the processes of Carbonate equilibrium alone indicate considerably different biogeochemical evolution of waters in the upper aquifer assemblage (HTU wells). Changes in 14C and 13C in the upper aquifer complexes result from a number of biotic and abiotic processes, including oxidation of 14C-depleted OM derived from recycled microbial Carbon and sedimentary organic matter as well as water–rock interactions. The microbial pathways inferred from DIC isotope shifts and changes in water chemistry in the HTU wells were supported by comparison with in situ microbial community structure based on 16S rRNA analyses. Our findings demonstrate the large variation in the importance of biotic as well as abiotic controls on 13C and 14C of DIC in closely related aquifer assemblages. Further, they support the importance of subsurface-derived Carbon sources like DIC for chemolithoautotrophic microorganisms as well as rock-derived organic matter for supporting heterotrophic groundwater microbial communities and indicate that even shallow aquifers have microbial communities that use a variety of subsurface-derived Carbon sources.
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Carbon Isotopes of dissolved inorganic Carbon reflect utilization of different Carbon sources by microbial communities in two limestone aquifer assemblages
Hydrology and Earth System Sciences, 2016Co-Authors: Martin Nowak, Valerie F Schwab, Cassandre Sara Lazar, Thomas Behrendt, Bernd Kohlhepp, Kai Uwe Totsche, Kirsten Kusel, Susan E TrumboreAbstract:Isotopes of dissolved inorganic Carbon (DIC) are used to indicate both transit times and biogeochemical evolution of groundwaters. These signals can be complicated in Carbonate aquifers, as both abiotic (i.e. Carbonate equilibria) and biotic factors influence δ 13 C and 14 C of DIC. We applied a novel graphical method for tracking changes in δ 13 C and 14 C of DIC in two distinct aquifer complexes identified in the Hainich Critical Zone Exploratory (CZE), a platform to study how water transport links surface and shallow groundwaters in limestone and marlstone rocks in central Germany. For more quantitative estimates of contributions of different biotic and abiotic Carbon sources to the DIC pool, we used the geochemical modelling program NETPATH, which accounts for changes in dissolved ions in addition to C Isotopes. Although water residence times in the Hainich CZE aquifers based on hydrogeology are relatively short (years or less), DIC Isotopes in the shallow, mostly anoxic, aquifer assemblage (HTU) were depleted in 14 C compared to a deeper, oxic, aquifer complex (HTL). Carbon Isotopes and chemical changes in the deeper HTL wells could be explained by interaction of recharge waters equilibrated with post-bomb 14 C sources with Carbonates. However, oxygen depletion and δ 13 C and 14 C values of DIC below those expected from the processes of Carbonate equilibrium alone indicate dramatically different biogeochemical evolution of waters in the upper aquifer assemblage (HTU wells). Changes of 14 C and 13 C in the upper aquifer complexes result from a number of biotic and abiotic processes, including oxidation of 14 C depleted OM derived from recycled microbial Carbon and sedimentary organic matter as well as water rock interactions. The microbial pathways inferred from DIC isotope shifts and changes in water chemistry in the HTU wells were supported by comparison with in situ microbial community structure based on 16S rRNA analyses. Our findings demonstrate the large variation in the importance of biotic as well as abiotic controls on 13 C and 14 C of DIC in closely related aquifer assemblages. Further, they support the importance of subsurface derived Carbon sources like DIC for chemolithoautotrophic microorganisms as well as rock-derived organic matter for supporting heterotrophic groundwater microbial communities and indicate that even shallow aquifers have microbial communities that use a variety of subsurface derived Carbon sources.
Deyu Gong - One of the best experts on this subject based on the ideXlab platform.
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stable Carbon Isotopes of coal derived gases sourced from the mesozoic coal measures in china
Organic Geochemistry, 2014Co-Authors: Deyu Gong, Shipeng Huang, Yunyan Ni, Wei WuAbstract:Coal-derived, large scale gas fields derived from the Mesozoic coal measures in China are mainly distributed in the Middle–Lower Jurassic coal measures in the Tarim, Junggar and Turpan-Hami basins in northwest China, and the Upper Triassic Xujiahe Formation coal measure in Sichuan Basin, central China. In 2011, the annual production was 21.6 × 109 m3 and the proved geological reserves were 2485 × 109 m3, accounting for 21% and 30% of the total in China, respectively. Based on analyses of gas composition and stable Carbon Isotopes ratios of 203 samples and stable Carbon Isotopes of 102 CO2 samples, the following conclusions were made. (a) Based on diagnostic plots using the stable Carbon isotopic and molecular composition of gas samples, alkane gas from the Mesozoic coal measures in China is shown to be coal-derived. (b) According to the δ13C2 vs. C2H6 plot of a great number of oil-derived and coal-derived gases in China, it is concluded that gases with δ13C2 > −28.5‰ are coal-derived and those with δ13C2 < −28.5‰ are oil-derived in most cases. (c) Among the natural gases from the Mesozoic coal measures in China, primary coal-derived gases with normal Carbon isotopic distribution pattern among the C1–C4 alkanes (i.e. δ13C1 < δ13C2 < δ13C3 < δ13C4) are dominant. (d) Carbon isotopic pattern reversal mainly results from the mixing of coal-derived gases having different maturities but the same source and secondly from microbial oxidation of propane (e.g. Mu 3 and Mu 4 wells in the Gumudi gas field, Junggar Basin). (e) CO2 in the coal-derived gases from the Mesozoic coal measures in China has both biogenic and abiogenic origins. The biogenic origin is dominant and the abiogenic CO2 is mainly found in the Kuqa Depression in the Tarim Basin and western Sichuan Basin. (f) Isotopic differences between heavy hydroCarbon gases and methane become less with increasing maturity.
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stable Carbon Isotopes of coal derived gases sourced from the mesozoic coal measures in china
Organic Geochemistry, 2014Co-Authors: Jinxing Dai, Deyu Gong, Shipeng HuangAbstract:Abstract Coal-derived, large scale gas fields derived from the Mesozoic coal measures in China are mainly distributed in the Middle–Lower Jurassic coal measures in the Tarim, Junggar and Turpan-Hami basins in northwest China, and the Upper Triassic Xujiahe Formation coal measure in Sichuan Basin, central China. In 2011, the annual production was 21.6 × 109 m3 and the proved geological reserves were 2485 × 109 m3, accounting for 21% and 30% of the total in China, respectively. Based on analyses of gas composition and stable Carbon Isotopes ratios of 203 samples and stable Carbon Isotopes of 102 CO2 samples, the following conclusions were made. (a) Based on diagnostic plots using the stable Carbon isotopic and molecular composition of gas samples, alkane gas from the Mesozoic coal measures in China is shown to be coal-derived. (b) According to the δ13C2 vs. C2H6 plot of a great number of oil-derived and coal-derived gases in China, it is concluded that gases with δ13C2 > −28.5‰ are coal-derived and those with δ13C2
Wei Wu - One of the best experts on this subject based on the ideXlab platform.
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stable Carbon Isotopes of coal derived gases sourced from the mesozoic coal measures in china
Organic Geochemistry, 2014Co-Authors: Deyu Gong, Shipeng Huang, Yunyan Ni, Wei WuAbstract:Coal-derived, large scale gas fields derived from the Mesozoic coal measures in China are mainly distributed in the Middle–Lower Jurassic coal measures in the Tarim, Junggar and Turpan-Hami basins in northwest China, and the Upper Triassic Xujiahe Formation coal measure in Sichuan Basin, central China. In 2011, the annual production was 21.6 × 109 m3 and the proved geological reserves were 2485 × 109 m3, accounting for 21% and 30% of the total in China, respectively. Based on analyses of gas composition and stable Carbon Isotopes ratios of 203 samples and stable Carbon Isotopes of 102 CO2 samples, the following conclusions were made. (a) Based on diagnostic plots using the stable Carbon isotopic and molecular composition of gas samples, alkane gas from the Mesozoic coal measures in China is shown to be coal-derived. (b) According to the δ13C2 vs. C2H6 plot of a great number of oil-derived and coal-derived gases in China, it is concluded that gases with δ13C2 > −28.5‰ are coal-derived and those with δ13C2 < −28.5‰ are oil-derived in most cases. (c) Among the natural gases from the Mesozoic coal measures in China, primary coal-derived gases with normal Carbon isotopic distribution pattern among the C1–C4 alkanes (i.e. δ13C1 < δ13C2 < δ13C3 < δ13C4) are dominant. (d) Carbon isotopic pattern reversal mainly results from the mixing of coal-derived gases having different maturities but the same source and secondly from microbial oxidation of propane (e.g. Mu 3 and Mu 4 wells in the Gumudi gas field, Junggar Basin). (e) CO2 in the coal-derived gases from the Mesozoic coal measures in China has both biogenic and abiogenic origins. The biogenic origin is dominant and the abiogenic CO2 is mainly found in the Kuqa Depression in the Tarim Basin and western Sichuan Basin. (f) Isotopic differences between heavy hydroCarbon gases and methane become less with increasing maturity.