Stability of a Petroleum-Like Hydrocarbon Mixture at Thermobaric Conditions That Correspond to Depths of 50 km

Serovaiskii, Aleksandr; Dubrovinky, Leonid; Kutcherov, Vladimir

doi:10.3390/min10040355

Cited by 5 publications

(1 citation statement)

References 25 publications

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“…First, a number of supergiant petroleum deposits have been discovered down to depths of 11 km [10]. Second, experimental data (see Figure S1) indicate that complex hydrocarbons are stable up to thermobaric conditions corresponding to depths of 50 km (723(±10) K and 1.4(±0.2) GPa) [11]. Third, it was demonstrated that a natural gas-like system could be reversibly formed from individual saturated hydrocarbons [12], or from different donors of carbon and hydrogen [13,14] in the temperature range of 1000 K to 1500 K and at pressures above 2 GPa (which corresponds to the pT parameters of slabs at 80-150 km depths) with simultaneous oxidation of Fe or FeO to Fe 3 O 4 .…”

Section: Introductionmentioning

confidence: 99%

Fate of Hydrocarbons in Iron-Bearing Mineral Environments during Subduction

et al. 2019

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Subducted sediments play a key role in the evolution of the continental crust and upper mantle. As part of the deep carbon cycle, hydrocarbons are accumulated in sediments of subduction zones and could eventually be transported with the slab below the crust, thus affecting processes in the deep Earth’s interior. However, the behavior of hydrocarbons during subduction is poorly understood. We experimentally investigated the chemical interaction of model hydrocarbon mixtures or natural oil with ferrous iron-bearing silicates and oxides (representing possible rock-forming materials) at pressure-temperature conditions of the Earth’s lower crust and upper mantle (up to 2000(±100) K and 10(±0.2) GPa), and characterized the run products using Raman and Mössbauer spectroscopies and X-ray diffraction. Our results demonstrate that complex hydrocarbons are stable on their own at thermobaric conditions corresponding to depths exceeding 50 km. We also found that chemical reactions between hydrocarbons and ferrous iron-bearing rocks during slab subduction lead to the formation of iron hydride and iron carbide. Iron hydride with relatively low melting temperature may form a liquid with negative buoyancy that could transport reduced iron and hydrogen to greater depths.

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Section: Introductionmentioning

confidence: 99%

Fate of Hydrocarbons in Iron-Bearing Mineral Environments during Subduction

et al. 2019

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Crude oil cracking in deep reservoirs: A review of the controlling factors and estimation methods

Qi¹,

Sun²,

Wang³

et al. 2023

Petroleum Science

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An inorganic origin of the “oil-source” rocks carbon substance

Marakushev

Belonogova

2021

Georesursy

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On the basis of an inorganic concept of the petroleum origin, the phase relationships of crystalline kerogens of black shales and liquid oil at the physicochemical conditions of a typical geobarotherm on the Texas Gulf Coast are considered. At the conditions of the carbon dioxide (CO2) high fluid pressure, the process of oil transformation into kerogens of varying degrees of “maturity” (retrograde metamorphism) takes place with decreasing temperature and hydrogen pressure. Kerogen generation in black shale rocks occurs by the sequential transition through metastable equilibria of liquid oil and crystalline kerogens (phase “freezing” of oil). The upward migration of hydrocarbons (HC) of oil fluids, clearly recorded in the processes of oil deposit replenishment in oil fields, shifts the oil ↔ kerogen equilibrium towards the formation of kerogen. In addition, with decreasing of the hydrogen chemical potential as a result of the process of high-temperature carboxylation and low-temperature hydration of oil hydrocarbons, the “mature” and “immature” kerogens are formed, respectively. The phase relationships of crystalline black shale kerogens and liquid oil under hypothetical conditions of high fluid pressure of the HC generated in the regime of geodynamic compression of silicate shells of the Earth in the result of the deep alkaline magmatism development. It is substantiated that a falling of hydrogen pressure in rising HC fluids will lead to the transformation of fluid hydrocarbons into liquid oil, and as the HC fluids rise to the surface, the HC ↔oil ↔ kerogen equilibrium will shift towards the formation of oil and kerogen. It is round that both in the geodynamic regime of compression and in the regime of expansion of the mantle and crust, carboxylation and hydration are the main geochemical pathways for the transformation of oil hydrocarbons into kerogen and, therefore, the most powerful geological mechanism for the black shale formations.

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Stability of a Petroleum-Like Hydrocarbon Mixture at Thermobaric Conditions That Correspond to Depths of 50 km

Cited by 5 publications

References 25 publications

Fate of Hydrocarbons in Iron-Bearing Mineral Environments during Subduction

Fate of Hydrocarbons in Iron-Bearing Mineral Environments during Subduction

Crude oil cracking in deep reservoirs: A review of the controlling factors and estimation methods

An inorganic origin of the “oil-source” rocks carbon substance

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