Serpentization of mantle peridotites as fundamental source of deep-seating hydrocarbons in the West Siberian basin
The authors have proposed a scheme for the formation of the hydrocarbon capacity of the West Siberian oil and gas basin in a paleosubduction geodynamic setting and continue developing the idea concerning the abiogenic deep genesis of hydrocarbons due to the low-temperature serpentinization of mantle...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | Russian |
| Published: |
Institute of Volcanology and Seismology FEB RAS
2020-04-01
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| Series: | Вестник Камчатской региональной ассоциации "Учебно-научный центр". Серия: Науки о Земле |
| Subjects: | |
| Online Access: | http://www.kscnet.ru/journal/kraesc/article/view/612 |
| Summary: | The authors have proposed a scheme for the formation of the hydrocarbon capacity of the West Siberian oil and gas basin in a paleosubduction geodynamic setting and continue developing the idea concerning the abiogenic deep genesis of hydrocarbons due to the low-temperature serpentinization of mantle peridotites during spreading in the Ordovician back-arc basin, which occupied at that time within the area of the future West Siberian basin, and the high-temperature hydration of peridotites in the mantle wedges above the subduction zones during the Selurian and Devonian. Another source of abyssal hydrocarbons is the serpentinization of mantle peridotites fragments in water saturated basement. A major role is being established in the formation of hydrocarbon deposits in the sedimentary cover of Western Siberia in the vertical migration of deep hydrocarbon fluids through degassing pipes, including anomalous annular zones, through deep thrusts, which are active gas-oil supply channels and along a large zone of Neogene-Quaternary low-amplitude horizontal shifts in the basement thickness. Deep-seated faults that comprise triassic rift system of West Siberian play a major role in water removal from deep sources. The feeding with new portions of oil and gas in hydrocarbon fields of West Siberian basin continues in present time, which provides renewability of regional hydrocarbons. The total volume of methane generated in the serpentinization zones of mantle peridotites is formed from two sources — abiotic (reaction of hydrogen with carbon dioxide dissolved in seawater) and biotic (methanogens). The origin of hydrocarbons is considered in the context of a new polygenetic scheme of oil and gas formation in the process of «abiogenic-biogenic» synthesis. |
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| ISSN: | 1816-5524 1816-5532 |