The effect of oil expulsion or retention on further thermal degradation of kerogen at the high maturity stage: A pyrolysis study of type II kerogen from Pingliang shale, China

Jia, Wanglu; Wang, Qiuling; Liu, Jinzhong; Peng, Ping’an; Li, Baohua; Lu, Jiqing

doi:10.1016/j.orggeochem.2014.03.009

Cited by 63 publications

(40 citation statements)

References 70 publications

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“…(c)), which may imply an increasing degree of demethylation for the methyl‐substituted aromatic hydrocarbons. These results agree well with those obtained from kerogen pyrolysis at high temperatures in a closed system . Demethylation was also evident in the polymethyl‐substituted benzenes, as indicated by the increasing ratio of trimethylbenzene to tetramethyl benzene (TMB/TTMB) with increasing pyrolysis duration (Fig.…”

Section: Resultssupporting

confidence: 89%

“…). A similar relatively large 13 C enrichment was also observed for the alkanes yielded from kerogens by pyrolysis in a closed system, where secondary cracking of n ‐alkanes was significant and the relative amount of aromatic hydrocarbons was much greater than that of n ‐alkanes . The δ 13 C values of n ‐alkanes generated between 60 s and 90 s normally vary between −35.2 and −34.5 ‰, which is consistent with those released by pyrolysis at 320°C for 3 days .…”

Section: Resultssupporting

confidence: 72%

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Carbon isotope analyses of n‐alkanes released from rapid pyrolysis of oil asphaltenes in a closed system

Chen

Jia

Peng

2016

Rapid Comm Mass Spectrometry

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Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 72%

Carbon isotope analyses of n‐alkanes released from rapid pyrolysis of oil asphaltenes in a closed system

Chen

Jia

Peng

2016

Rapid Comm Mass Spectrometry

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“…Following the research method of Pan et al (2006) and Jia et al (2014), the gold tube was removed and carefully placed into a custom-made vacuum glass tube. The vacuum tube was connected to an Agilent 6890 N full-component gas chromatograph (GC), which was modified by Wasson ECE Instrumentation for determination of gas molecular composition.…”

Section: Experimental Analysismentioning

confidence: 99%

Catalytic Hydrogenation of Post-Mature Hydrocarbon Source Rocks Under Deep-Derived Fluids: An Example of Early Cambrian Yurtus Formation, Tarim Basin, NW China

et al. 2021

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As a link between the internal and external basin, the deep derived fluids play a key role during the processes of hydrocarbon (HC) formation and accumulation in the form of organic-inorganic interaction. Two questions remain to be answered: How do deep-derived fluids affect HC generation in source rocks by carrying a large amount of matter and energy, especially in post-mature source rocks with weak HC generation capability? Can hydrogen and catalysts from deep sources significantly increase the HC generation potential of the source rock? In this study, we selected the post-mature kerogen samples of the early Cambrian Yurtus Formation in the Tarim Basin of China. Under the catalytic environment of ZnCl2 and MoS2, closed system gold tube thermal simulation experiments were conducted to quantitatively verify the contribution of catalytic hydrogenation to "HC promotion" by adding H2. The catalytic hydrogenation increased the kerogen HC generation capacity by 1.4–2.1 times. The catalytic hydrogenation intensity reaction increased with temperature. The drying coefficient of the generated gas decreased significantly as the increasing yield of heavy HC gas. In the simulation experiment, alkane δ13C becomes lighter after the catalytic hydrogenation experiment, while δ13CCO2 becomes heavier. In the process of catalytic hydrogenation, the number of gaseous products catalyzed by ZnCl2 is higher than that catalyzed by MoS2 under the same conditions, indicating that ZnCl2 is a better catalyst for the generation of gaseous yield. Meanwhile, Fischer-Tropsch synthesis (FFT) reaction was happened in the catalytic hydrogenation process. The simulation experiment demonstrates that hydrogen-rich components and metal elements in deep-derived fluids have significant catalytic hydrogenation effects on organic-rich matter, which improved the HC generation efficiency of post-mature source rocks.

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“…Nowadays, as shale oil and gas, which are hydrocarbons retained in source rocks, are gaining increasingly important positions in fuel energy. The relationship between hydrocarbon generation, retention and expulsion has become an issue receiving much attention (Jia et al 2014;Han et al 2015;Ziegs et al 2017). None of these three processes can be considered as independent, because they interact with each other during thermal maturation.…”

Section: Introductionmentioning

confidence: 99%

“…None of these three processes can be considered as independent, because they interact with each other during thermal maturation. Some studies report that hydrocarbon expulsion efficiency plays an important role on resource abundance in a shale oil/gas layer (Jarvie et al 2007;Jia et al 2014;Li et al 2015). Petroleum geologists have found that retained oil in shales influences not only the gas generation potential at high maturities, but also the chemical compositions of gaseous products (Gai et al 2015;Pan et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Hydrocarbon generation from lacustrine shales with retained oil during thermal maturation

Shao

Pang

et al. 2020

Pet. Sci.

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Thermal maturation in the shale oil/gas system is inherently complex due to the competitive interplays between hydrocarbon generation and retention processes. To study hydrocarbon generation characteristics from shales within different stages of thermal maturation under the influence of retained oil, we performed Micro-Scale Sealed Vessels (MSSV) pyrolysis on a set of artificially matured lacustrine shale samples from the Shahejie Formation in the Dongpu Depression in Bohai Bay Basin, China. Experimental results show that hydrocarbon yields of shale samples with or without retained oil at various thermal maturities follow different evolution paths. Heavy components (C 15+) in samples crack at high temperatures and generally follow a sequence, where they first transform into C 6-14 then to C 2-5 and C 1. Methane accounts for most of the gaseous products at high temperatures in all samples, with different origins. The cracking of C 2-5 is the main methane-generating process in samples with retained oil, whereas the source of methane in samples without retained oil is kerogen. In the studied shales, retained oils at early-mature stage retard the transformation of liquid to gaseous hydrocarbon and prompt the cracking of C 2-5 to C 1 to some extent. TSR reaction related to gypsum in the studied samples is the primary reason that can explain the loss of hydrocarbon yields, especially at high temperatures. In addition, transformation of volatile hydrocarbons to gas and coke also accounts for the loss of generated hydrocarbon, as a secondary factor.

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The effect of oil expulsion or retention on further thermal degradation of kerogen at the high maturity stage: A pyrolysis study of type II kerogen from Pingliang shale, China

Cited by 63 publications

References 70 publications

Carbon isotope analyses of n‐alkanes released from rapid pyrolysis of oil asphaltenes in a closed system

Carbon isotope analyses of n‐alkanes released from rapid pyrolysis of oil asphaltenes in a closed system

Catalytic Hydrogenation of Post-Mature Hydrocarbon Source Rocks Under Deep-Derived Fluids: An Example of Early Cambrian Yurtus Formation, Tarim Basin, NW China

Hydrocarbon generation from lacustrine shales with retained oil during thermal maturation

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