An experimental comparison of gas generation from three oil fractions: Implications for the chemical and stable carbon isotopic signatures of oil cracking gas

2012 ◽  
Vol 46 ◽  
pp. 96-112 ◽  
Author(s):  
Hui Tian ◽  
Xianming Xiao ◽  
Ronald W.T. Wilkins ◽  
Yongchun Tang
Keyword(s):  
Experimental Comparison ◽  
Stable Carbon ◽  
Gas Generation ◽  
Isotopic Signatures ◽  
Carbon Isotopic ◽  
Oil Fractions ◽  
Oil Cracking Gas ◽  
Oil Cracking ◽  
Cracking Gas

scholarly journals Biosignatures of ancient microbial life are present across the igneous crust of the Fennoscandian shield

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Henrik Drake ◽  
Nick M. W. Roberts ◽  
Manuel Reinhardt ◽  
Martin Whitehouse ◽  
Magnus Ivarsson ◽  
...  
Keyword(s):  
Fennoscandian Shield ◽  
Stable Carbon ◽  
Deep Biosphere ◽  
Isotopic Signatures ◽  
Microbial Life ◽  
Carbon Isotopic ◽  
Terrestrial Life ◽  
Vein Mineral ◽  
Methyl Branched Fatty Acids

AbstractEarth’s crust contains a substantial proportion of global biomass, hosting microbial life up to several kilometers depth. Yet, knowledge of the evolution and extent of life in this environment remains elusive and patchy. Here we present isotopic, molecular and morphological signatures for deep ancient life in vein mineral specimens from mines distributed across the Precambrian Fennoscandian shield. Stable carbon isotopic signatures of calcite indicate microbial methanogenesis. In addition, sulfur isotope variability in pyrite, supported by stable carbon isotopic signatures of methyl-branched fatty acids, suggest subsequent bacterial sulfate reduction. Carbonate geochronology constrains the timing of these processes to the Cenozoic. We suggest that signatures of an ancient deep biosphere and long-term microbial activity are present throughout this shield. We suggest that microbes may have been active in the continental igneous crust over geological timescales, and that subsurface investigations may be valuable in the search for extra-terrestrial life.

scholarly journals Experimental research on the potential of sapropelic kerogen degradation gas and discrimination of oil cracking gas

2016 ◽  
Vol 1 (6) ◽  
pp. 471-479 ◽  
Author(s):  
Zengye Xie ◽  
Zhisheng Li ◽  
Guoqi Wei ◽  
Jian Li ◽  
Dongliang Wang ◽  
...  
Keyword(s):  
Experimental Research ◽  
Oil Cracking Gas ◽  
Oil Cracking ◽  
Cracking Gas

Contribution of insoluble organic matters to late gas generation from mature Salgan Shale

2015 ◽  
Vol 3 (2) ◽  
pp. SJ81-SJ93
Author(s):  
Qingtao Wang ◽  
Hong Lu ◽  
Chenchen Shen ◽  
Jing Liao
Keyword(s):  
Shale Gas ◽  
Methane Yield ◽  
Stable Carbon ◽  
Bulk Rock ◽  
Gas Generation ◽  
Hydrocarbon Gases ◽  
Simulation Experiments ◽  
Methane Generation ◽  
Carbon Isotopic ◽  
Yield Formula

We used bulk rock (BR), solvent extracted BR, isolated kerogen, and bitumen from a mature Salgan Shale as reactants during gold-tube simulation experiments to investigate the contribution of insoluble kerogen to late-stage gas generation at high thermal stress. We measured the gas yields and stable carbon isotopic compositions of methane, ethane, and propane. The high methane yield ([Formula: see text] methane yield at 600°C) in BR series demonstrated the huge potential for late methane generation. The maximum methane yield (normalized to total organic compound) in the bitumen series is twice more than that in the BR series. This phenomenon is interpreted by the high availabilities of hydrogen. However, bitumen only takes up a very small proportion of the overall BR, and generated gas from bitumen cracking is limited. Thus, in mature Salgan Shale, kerogen cracking contributes more hydrocarbon gases than that from bitumen cracking. Meanwhile, generated gas from kerogen cracking is very dry and enriched in the [Formula: see text] isotope, whereas gas cracked from retained oil is much wetter and associated with much lighter [Formula: see text] values. Mature kerogen cracking is also helpful to enlarge the shale gas reserve at high maturities especially when the retained oil is limited.

Source identification of PAHs in soils based on stable carbon isotopic signatures

2018 ◽  
Vol 48 (13-15) ◽  
pp. 923-948 ◽  
Author(s):  
Peng Gao ◽  
Hongbo Li ◽  
Chris P. Wilson ◽  
Timothy G. Townsend ◽  
Ping Xiang ◽  
...  
Keyword(s):  
Source Identification ◽  
Stable Carbon ◽  
Isotopic Signatures ◽  
Carbon Isotopic
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