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  • 1.
    Mukhina, E
    et al.
    KTH.
    Kolesnikov, A.
    Kutcherov, V.
    KTH.
    The lower pT limit of deep hydrocarbon synthesis by CaCO3 aqueous reduction2017In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 5749Article in journal (Refereed)
    Abstract [en]

    The deep abiogenic synthesis of hydrocarbons is possible under the conditions of the asthenosphere. We have found that this process can also occur under the mineral and thermobaric conditions of subducting slabs. We have investigated the abiogenic synthesis of hydrocarbon systems at pressures of 2.0-6.6 GPa and temperatures of 250-600 degrees C. The determined lower thermobaric limit of the reaction at 280-300 degrees C and 2-3 GPa corresponds to a depth of 70-80 km during cold subduction. The hydrocarbon fluid formed in the slab can migrate upwards through the network of faults and fractures to form petroleum deposits.

  • 2.
    Mukhina, Elena
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Gubkin Russian State University.
    Deep generated methane in the global methane budget2018Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Methane is a significant part of the global carbon cycle. The distribution of methane above and below the Earth’s surface suggests that atmospheric methane might be related to methane originating from the deep mantle.

    The purpose of the present study is to identify this relationship between methane emissions to the atmosphere and methane, which can be abiogenically generated within the Earth’s interior. Methane hydrates within the Earth’s surface sediments might be among the possible hosts of migrated deep methane.

    In this thesis, experimental work is presented, which aimed to reveal the depth at which methane and other hydrocarbons in the upper mantle are abiogenically generated, considering pT and redox conditions of the surrounding environment. High-pressure, high-temperature experiments were conducted using a large reactive volume device with a toroid-type chamber in specially prepared sample containers.

    The present study evaluates the formation of methane and other hydrocarbons at temperatures higher than 300 °C at pressures of 2.5-6.5 GPa despite the redox conditions of the surroundings. These conditions correspond to a depth below 70 km on the surface of a cold subducting slab.

    The proposed hypothesis claims that the deep-mantle-generated methane can contribute to the formation of methane hydrates and accumulation of free gas below hydrates. 

  • 3.
    Mukhina, Elena
    et al.
    KTH.
    Kolesnikov, A
    KTH.
    Kudryavtsev, D
    KTH.
    Kutcherov, V
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Deep genesis of hydrocarbons under oxidized conditionsIn: Article in journal (Refereed)
  • 4.
    Mukhina, Elena
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Gubkin Russian State University of Oil and Gas,Russian Federation.
    Kolesnikov, A. Yu
    Serovaiskii, Aleksandr Yu
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Gubkin Russian State University of Oil and Gas,Russian Federation.
    Kutcherov, Vladimir G.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Gubkin Russian State University of Oil and Gas,Russian Federation.
    Experimental Modelling of Hydrocarbon Migration Processes2017In: Joint AIRAPT-25th and EHPRG-53rd International Conference on High Pressure Science and Technology, 2015, Institute of Physics (IOP), 2017, article id 042040Conference paper (Refereed)
    Abstract [en]

    One of the most important questions in the frame of the concept of deep abiogenic origin of hydrocarbons is how hydrocarbons generated under the upper mantle conditions could migrate upward to the Earth's crust to form hydrocarbon deposits. Two different ways of fluid migration were proposed and simulated - slow migration during hundreds of years and fast migration-eruption. Influence of the fluid's migration speed on the final hydrocarbon mixture composition was studied. The received results show that the relative chemical composition of the hydrocarbon mixtures probably does not depend on the cooling conditions (the speed of the fluid migration).

  • 5.
    Mukhina, Elena
    et al.
    KTH.
    Kudryavtsev, D
    KTH.
    Kolesnikov, A
    Serovaisky, A
    KTH.
    Kutcherov, Vladimir G.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    The influence of a sample container material on high pressure formation of hydrocarbonsIn: Article in journal (Refereed)
  • 6.
    Serovaiskii, Aleksandr Yu
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Gubkin Russian State University of Oil and Gas, Russian Federation.
    Kolesnikov, Anton
    Mukhina, Elena
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Gubkin Russian State University of Oil and Gas, Russian Federation.
    Kutcherov, Vladimir G.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Gubkin Russian State University of Oil and Gas, Russian Federation.
    The photochemical reaction of hydrocarbons under extreme thermobaric conditions2017In: Joint AIRAPT-25th and EHPRG-53rd International Conference on High Pressure Science and Technology, 2015, Institute of Physics Publishing (IOPP), 2017, article id 042056Conference paper (Refereed)
    Abstract [en]

    The photochemical reaction of hydrocarbons was found to play an important role in the experiments with the synthetic petroleum conducted in Diamond Anvil Cell (DAC). Raman spectroscopy with a green laser (514.5 nm) was used for in situ sample analysis. This photochemical effect was investigated in the pressure range of 0.7-5 GPa, in the temperature interval from the ambient conditions to 450 degrees C. The power of laser used in these experiment series was from 0.05 W to 0.6 W. The chemical transformation was observed when the necessary threshold pressure (similar to 2.8 GPa) was reached. This transformation correlated with the luminescence appearance on the Raman spectra and a black opaque spot in the sample was observed in the place where the laser focus was forwarded. The exposure time and laser power (at least in the 0.1-0.5 W range) did not play a role in the 0.1-0.5 GPa range.

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