Methane hydrate in crystalline bedrock and explosive methane venting tectonics

Mörner, Nils‐Axel

doi:10.1016/j.earscirev.2017.05.003

Cited by 11 publications

(44 citation statements)

References 25 publications

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“…Besides the main fault deformations, secondary faults and fractures were generated, too. There are examples of quite significant secondary bedrock deformations in Sweden [4] [10] [14] [15].…”

Section: Bedrock Deformationmentioning

confidence: 99%

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Sediment Deformations Due to Paleoseismic Events

Mörner¹

2019

OJER

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There are many different processes generating soft-sediment deformation. This paper is confined to deformations generated by paleoseismic events in Sweden. The Paleoseismic Catalogue of Sweden includes 66 events. The structural characteristics and driving forces of liquefaction are discussed in details. "Crypto-deformations" refer to a special type of fluidization not affecting the sedimentary bedding itself, but the internal orientation of the ChRM and AMS carrying particles. Extensive turbidites are formed at some events. They constitute useful "marker-varves". Out of the 66 paleoseismic events, 31 are dated by varves as to a single year (in one case even to the season of a year). Tsunamites are recorded from 19 of the paleoseismic events; some with wave-heights up to 15 -20 m.

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Section: Bedrock Deformationmentioning

confidence: 99%

“…Some of them, however, are caused by methane-venting-tectonics; i.e. they are the function of explosive venting when methane ice is suddenly transformed into methane gas [4] [5] [10] [14].…”

Section: Bedrock Deformationmentioning

confidence: 99%

Sediment Deformations Due to Paleoseismic Events

Mörner¹

2019

OJER

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“…2,3 Global methane hydrates have twice the carbon reserves of proven fossil energies such as oil, coal and natural gas. [6][7][8][9] Scholars from various countries have carried out a lot of research on the mechanical properties of the formation with hydrate, and found that hydrate reservoirs have low strength and strong creep properties. [6][7][8][9] Scholars from various countries have carried out a lot of research on the mechanical properties of the formation with hydrate, and found that hydrate reservoirs have low strength and strong creep properties.…”

Section: Introductionmentioning

confidence: 99%

“…4,5 Limited by hydrate phase equilibrium conditions and geothermal gradients, methane hydrates are mainly distributed in deep seas and permafrost regions, with shallow depth of storage and poor cementation of sediments. [6][7][8][9] Scholars from various countries have carried out a lot of research on the mechanical properties of the formation with hydrate, and found that hydrate reservoirs have low strength and strong creep properties. 10,11 As hydrates play a strong cementation role in the reservoir, differences in hydrate saturation may take a large effect on their creep properties.…”

Section: Introductionmentioning

confidence: 99%

Wellbore shrinkage during drilling in methane hydrate reservoirs

Yan

Yang

Yan³

et al. 2019

Energy Science & Engineering

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Methane hydrates as a clean and abundant energy source, have attracted the attention of the world. However, the instability of hydrate reservoirs makes it difficult to drill production wells. After drilling, the creep properties of hydrate reservoir would cause wellbore shrinkage, which will affect the drilling safety. This study is to analysis law of wellbore shrinkage after a hydrate well drilled. The results demonstrate that wellbore shrinkage mainly results from plastic deformation and creep deformation. The largest and smallest values are separately found in the directions of the maximum and minimum horizontal in‐situ stress. With the increase of initial in‐situ stress ratio, wellbore shrinkage linearly rise. Under the condition of low horizontal in‐situ stress ratio, wellbore shrinkage is mainly determined by creep deformation. Under the condition of high horizontal in‐situ stress ratio, wellbore shrinkage commonly depends on plastic deformation and creep deformation. With deepening methane hydrate reservoirs, wellbore shrinkage shows a nonlinear increase. For formations with higher hydrate saturation, larger wellbore shrinkage would occur. The research results can provide a theoretical basis for the selection of drilling method while drilling in hydrate formations.

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“…Methane venting tectonics is a novel factor, which it has taken time to evolve from the first idea [17] [18] [19] to observational confirmation [10] and finally to full presentation [20] [21], summarized in [22]. It implies the sudden phase transition from methane hydrate stored in voids and fractures in the bedrock to methane gas venting explosively to the surface, by that causing severe bedrock deformation.…”

Section: The 2900 Bp Methane Venting Tectonics Eventmentioning

confidence: 99%

Converting Tsunami Wave Heights to Earthquake Magnitudes

Mörner¹

2017

OJER

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There is a fairly strict relation between maximum tsunami wave heights and causation earthquake magnitudes. This provides a new tool for estimating the magnitude of past earthquakes from the observed wave heights of related paleo-tsunami events. The method is subjected to a test versus two paleoseismic events with multiple independent estimates of corresponding earthquake magnitude. The agreement to the tsunami wave height conversion is good, confirming very high magnitudes of M 8.5 -9.0 and M 8.4 -8.5. Applying the same method to two Late Holocene events of methane venting tectonics indicates a ground shaking of forces equivalent to a M 8.0 earthquake, seriously changing previous long-term crustal hazard assessments.

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Methane hydrate in crystalline bedrock and explosive methane venting tectonics

Cited by 11 publications

References 25 publications

Sediment Deformations Due to Paleoseismic Events

Sediment Deformations Due to Paleoseismic Events

Wellbore shrinkage during drilling in methane hydrate reservoirs

Converting Tsunami Wave Heights to Earthquake Magnitudes

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