The Volume of Gas Hydrate‐Bound Gas in the Northern Gulf of Mexico

Majumdar, Urmi; Cook, Ann E.

doi:10.1029/2018gc007865

Cited by 12 publications

(4 citation statements)

References 73 publications

(139 reference statements)

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“…In addition, a survey of industry well logs from the northern Gulf of Mexico, revealed 124 of these wells to have hydrate of which 93 hosted hydrate in clay‐rich sediments. Most of this hydrate is in low concentrations in these marine mud and could very well be in the form of fractures (Majumdar et al, ; Majumdar & Cook, ). The fractures at these locations could be a sourced and propagated via short‐migration fraction formation.…”

Section: Discussionmentioning

confidence: 99%

Hydrate‐filled Fracture Formation at Keathley Canyon 151, Gulf of Mexico, and Implications for Non‐vent Sites

Oti

Cook

Welch

et al. 2019

Geochem Geophys Geosyst

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Near‐vertical hydrate‐filled fractures are found in subseafloor marine muds, at both advective methane vent sites and at sites without obvious methane and fluid advection (non‐vent sites). At non‐vent sites, the mechanisms that transport methane to the fractures and control how hydrate‐filled fractures form are not well understood. However, these mechanisms are important to establish, as most of Earth's natural gas hydrate is likely bound in marine mud systems. Herein, we focus on understanding the origin of hydrate and how fracture form at non‐vent sites by examining previously hydrate‐bearing fractures in conventional cores taken from Keathley Canyon 151, U.S. northern Gulf of Mexico, drilled by the Gas Hydrate Joint Industry Project in 2005. We combine information from well logs, sediment cores, and science party results and add new X‐ray computed tomography of archival sections and scanning electron microcopy of core samples to develop a conceptual model. We propose that locally generated microbial methane is transported via diffusion from small pores in marine mud into biomineralized burrows with larger pore size in a process called short‐range migration. Hydrate forms in burrows once the methane diffuses into them and the dissolved methane concentration exceeds the solubility threshold. When hydrate fills a burrow, heave from additional hydrate growth places stress on the burrow edges, expands the fracture, and creates additional void space in which methane can diffuse and continue forming hydrate. Fractures slowly propagate in the direction of maximum principal stress.

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Section: Discussionmentioning

confidence: 99%

Hydrate‐filled Fracture Formation at Keathley Canyon 151, Gulf of Mexico, and Implications for Non‐vent Sites

Oti

Cook

Welch

et al. 2019

Geochem Geophys Geosyst

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“…where Cthe gas expansion coefficient from the sediment condition to the standard temperature and pressure, C = 140 [26];  is sediment porosity exponentially decreased downward from the value 0.4 at the top of the sediments; R = 0.7168 kg/m 3 methane density; Sh = 0.05 is fraction of pore volume occupied by hydrates [25,27]. Then, total methane content per unit area of the sediments (1 m 2 ) is calculated by integrating m(CH4) over the estimated MHSZ.…”

Section: Methodsmentioning

confidence: 99%

Estimation of the methane release intensity from the Arctic shelf bottom sediments

Malakhova

Елисеев

2022

28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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Large reserves of carbon are preserved under conditions of subsea permafrost in the bottom sediments of the Arctic shelf. The existence of permafrost has created the necessary conditions for the thermodynamic stability of methane hydrates. Using a mathematical model that describes the thermal state of the sediment, we analyzed the dynamics of the permafrost and methane hydrates stability zone of the Arctic shelf bottom sediments for 100 thousand years in the future. Climate changes are considered under an idealized scenario of CO2 emissions into the atmosphere and changes in the parameters of the earth's orbit. The simulations for the next 100 kyr found that at the middle and shallow parts of the shelf the subsea permafrost survives, at least, for 9 kyr after the emission onset or even for several tens of kiloyears. Model estimates of methane emission from the Arctic shelf sediments to the water amounts up to 10 g/m 2 per year.

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“…In 2008, the Gulf of Mexico Hydrates Research Consortium designed and implemented the Monitoring Station/Seafloor Observatory (MS-SFO) (Majumdar and Cook, 2018;Moore et al, 2022), which was a seafloor observatory network with the purpose of monitoring gas hydrate-bearing sediment dynamics the Woolsey Mound in MC118. The seafloor observatory consists of seismicacoustic receiving arrays, geochemical arrays in bottom water column and upper sediments, micro-biologic sensors, and s series of arrays: Horizontal Line Array (HLA), Vertical Line Array (VLA), Chimney Sampler Array (CSA), Pore-fluid Array (PFA), and Benthic Boundary Line Array (BBLA), etc.…”

Section: Limitation Of Current Monitoring Systemmentioning

confidence: 99%

A review on the methane emission detection during offshore natural gas hydrate production

et al. 2023

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Due to the high energy density, large potential reserves and only release CO2 and water after combustion, natural gas hydrate (NGH) is considered as the most likely new clean energy source to replace traditional fossil energy (crude oil, natural gas, etc.). However, unlike the exploitation of traditional fossil energy, the essence of natural gas hydrate exploitation is to induce the production of methane by artificially decompose the natural gas hydrate and to simultaneously collect the generated methane. Because of the uncontrollable decomposition, the methane percolation and the gas collection efficiency, methane emission is inevitably occurred during natural gas hydrate exploitation, which could significantly affect the environmental friendliness of natural gas hydrate. In this review, the methane emission detection was divided into three interfaces: Seafloor and sediment, seawater, atmosphere. Meanwhile, according the summary and analysis of existing methane emission detection technologies and devices, it was concluded that the existing detection technologies can identify and quantify the methane emission and amount in the three interfaces, although the accuracy is different. For natural gas hydrate exploitation, quantifying the environmental impact of methane emission and predicting the diffusion path of methane, especially the methane diffusion in strata and seawater, should be the focus of subsequent research.

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The Volume of Gas Hydrate‐Bound Gas in the Northern Gulf of Mexico

Cited by 12 publications

References 73 publications

Hydrate‐filled Fracture Formation at Keathley Canyon 151, Gulf of Mexico, and Implications for Non‐vent Sites

Hydrate‐filled Fracture Formation at Keathley Canyon 151, Gulf of Mexico, and Implications for Non‐vent Sites

Estimation of the methane release intensity from the Arctic shelf bottom sediments

A review on the methane emission detection during offshore natural gas hydrate production

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