Upper thermal maturity limit for gas generation from humic coal

Mi, Jingkui; Zhang, Shuichang; Chen, Jianping; He, Kun; Liu, Keyu; Li, Xianqing; Bi, Lina

doi:10.1016/j.coal.2015.08.009

Cited by 11 publications

(6 citation statements)

References 23 publications

(39 reference statements)

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“…Yao et al 22 proposed that there is no aliphatic chains with more than two carbon atom in the chemical structure of coal with maturity of 2.8% R o by measurement using fourier transform infrared spectroscopy (FTIR) for geological samples and the residues of coal pyrolysis. Mi et al 23 presented a similar result that only methyl as side chain could be measured by 13 C nuclear magnetic resonance in the chemical structure of coal with maturity more than 3.0% R o . The carbon isotopic reversal must have relationship with demethylation.…”

Section: Preliminary Study For Mechanism Of Carbon Isotopic Rollover mentioning

confidence: 71%

“…The measurement results about chemical structure indicate that only methyl as the side chains linked on aromatic rings for the coal samples with maturity more than 3.0%R o . 23 In theory, the unique component of gas generated via demethylation at the maturity more than 3.0%R o should just be methane. However, there is some heavy gas occurred both in the natural gas found in shale gas or coal measure tight gas with source rock maturity more than 3.0%R o and in the gases produced in lab by trimethylbenzene cracking.…”

Section: Preliminary Study For Mechanism Of Carbon Isotopic Rollover mentioning

confidence: 99%

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The evolution and preliminary genesis of the carbon isotope for coal measure tight gas: cases from upper paleozoic gas pools of ordos basin and xujiahe formation gas pools of sichuan basin, China

Mi¹,

Hu²,

Bai³

et al. 2017

IPCSE

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In this study, the geochemistry data of 162 coal measure tight gas samples (77) samples from Ordos Basin, 85 samples from Sichuan Basin) is collected. Then, the carbon isotope evolution of coal measure tight sandstone gas is investigated. The result indicates that three features in carbon isotope evolution of coal measure tight gas appear. (1) The coal measure tight gas has a same feature as shale gas, that the carbon isotope of heavy gas would show a rollover with the decreasing wetness of gases. The corresponding range of gas wetness is about 2.5%~5% at which the carbon isotope of ethane begin to rollover. (2) The carbon isotope series of coal measure tight gas presents successively positive sequence, partial reversal and full reversal with increasing maturity of source rock. (3) The maturity ranges corresponding to of coal measure tight gas with the positive sequence, partial reverse and full reverse of carbon isotope are R o <2.0 %, R o =1.75~3.0% and R o >3.0% of in-situ source rock, respectively. On the bases of pyrolysis experiment of a I type of organic matter, the authors propose that the mixing between primary and cracking gas could just only cause the carbon isotope rollover of heavy hydrocarbon gases, but not cause the carbon isotopic reversal of hydrocarbon. Finally, a conclusion is suggested that carbon isotope reversal of coal measure gas has a close relationship with demethylation happening at the maturity above 3.0% R o according to published data about coal chemical structure measurement. The isotopic fractionation during the process of heavy gases formation by linkage of methyl from demethylation is one of capital factors of carbon isotopic reversal.

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Section: Preliminary Study For Mechanism Of Carbon Isotopic Rollover mentioning

confidence: 71%

Section: Preliminary Study For Mechanism Of Carbon Isotopic Rollover mentioning

confidence: 99%

The evolution and preliminary genesis of the carbon isotope for coal measure tight gas: cases from upper paleozoic gas pools of ordos basin and xujiahe formation gas pools of sichuan basin, China

Mi¹,

Hu²,

Bai³

et al. 2017

IPCSE

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“…A lot of thermal simulation experiments on organic matter have been done by previous studies. − The thermal simulation experiment can be divided into open, semi-open, and closed systems, according to experimental conditions . Samples of the thermal simulation experiment include dark mudstone, coal, ,, sapropelic kerogen, and humic kerogen. , We collected the gas products of the thermal simulation experiment and analyzed the simulated gas components together with carbon and hydrogen isotopic compositions of methane. In accordance with previous experimental results, − , alkane content should increase with increasing experimental temperature.…”

Section: Discussionmentioning

confidence: 99%

“…Samples of the thermal simulation experiment include dark mudstone, coal, ,, sapropelic kerogen, and humic kerogen. , We collected the gas products of the thermal simulation experiment and analyzed the simulated gas components together with carbon and hydrogen isotopic compositions of methane. In accordance with previous experimental results, − , alkane content should increase with increasing experimental temperature. However, in our simulation experiment, gas leakage existed at 440 °C, rendering the methane component abnormal (Figure and Table ).…”

Section: Discussionmentioning

confidence: 99%

First Discovery and Significance of Liquid Mercury in a Thermal Simulation Experiment on Humic Kerogen

Peng

Liu²,

Feng

et al. 2019

Energy Fuels

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We found for the first time enriched liquid mercury beads in a thermal simulation experiment on humic kerogen extracted from coal, which provided some kind of direct evidence that mercury can be released from coal measure during maturation. In the simulation experiment, mass distribution of liquid mercury beads is between 0.0083 and 0.2242 g; their content in simulated gas ranges from 372.5 to 2776.3 ng/m3; and their yield was from 0.3102 × 10–3 to 7.4312 × 10–3 g/g sample. Along with this thermal simulation experiment and previous studies, three genetic models of mercury in gas reservoirs are summarized: source-rock controlling type, fault-controlling type, and source-rock/fault joint controlling type. Mercury in source-rock-controlling gas reservoirs is mainly derived from source rocks, which are generally coal measures. Mercury in fault-controlling gas reservoirs is mainly derived from deep geologic fluids, with relatively small contribution from source rocks. The transitional source-rock/fault joint controlling type mainly develops in tectonic activity zones where source rocks can be either sapropelic or humic. Liquid mercury collected for the first time in a simulation experiment has important theoretical significance for the exploration and development of natural gas, as well as important practical significance for the prevention of mercury accidents in natural gas exploration and production.

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“…Hydrocarbon generation simulation and kinetics research suggested that gases from kerogen cracking could be extended to a relatively higher maturity stage [3,4]. It is indicated that although the abundance of long, fatly chains in high-to-over-mature kerogen decreases drastically, there is still certain amount of short branched aliphatic structures present, and the lower limit for gas from kerogen cracking can be extended to a maturity stage with Ro reaching 3.5% [5]. This suggests that high-to-over-mature kerogens in deep and ultradeep strata are still capable of providing material basis for gas generation.…”

Section: Petroleum Generation Migration and Accumulation In Deep Sementioning

confidence: 99%

Geofluids in Deep Sedimentary Basins and Their Significance for Petroleum Accumulation

et al. 2017

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Upper thermal maturity limit for gas generation from humic coal

Cited by 11 publications

References 23 publications

The evolution and preliminary genesis of the carbon isotope for coal measure tight gas: cases from upper paleozoic gas pools of ordos basin and xujiahe formation gas pools of sichuan basin, China

The evolution and preliminary genesis of the carbon isotope for coal measure tight gas: cases from upper paleozoic gas pools of ordos basin and xujiahe formation gas pools of sichuan basin, China

First Discovery and Significance of Liquid Mercury in a Thermal Simulation Experiment on Humic Kerogen

Geofluids in Deep Sedimentary Basins and Their Significance for Petroleum Accumulation

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