Hydrate research activities that both support and derive from the monitoring station/sea-floor Observatory, Mississippi Canyon 118, northern Gulf of Mexico

Lutken, Carol

doi:10.2172/1123497

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…The MC118 site is shallower than GC600, with a water depth of approximately 850 m. The Rudyville vent is found in a small depression at MC118 and released predominantly gaseous bubbles at rapid rates. Oil slicks are infrequently visible at the surface; however, persistent gas seepage is confirmed by repeated mapping of vent activity combining bathymetric and seismic data (Lutken and Welch, 2013;Simonetti et al, 2013;Wilson et al, 2014). This area is underlain by deposits of gas hydrate within fault zones (Dunbar, 2012).…”

Section: Study Sitementioning

confidence: 89%

Time series video analysis of bubble release processes at natural hydrocarbon seeps in the Northern Gulf of Mexico

Johansen

Todd²,

MacDonald

2017

Marine and Petroleum Geology

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This research quantifies the rate and volume of oil and gas released from two natural seep sites in the Gulf of Mexico: lease blocks GC600 (1200 m depth) and MC118 (850 m depth). Our objectives were to determine variability in release rates and bubble size at five individual vents and to investigate the effects of tidal fluctuations on bubble release. Observations with autonomous video cameras captured the formation of individual bubbles as they were released through partially exposed deposits of gas hydrate. Observations and image processing techniques determined bubble type (oily, gaseous, and mixed: oily and gaseous), size distribution, release rate, and temporal variations (observation intervals ranged from 3 h to 26 d). A semi-automatic bubble counting algorithm was developed to analyze bubble count and release rates from video data. This method is suitable for discrete vents with small bubble streams commonly seen at seeps and is adaptable to multiple in situ setups. Two vents at GC600 (Birthday Candles 1 and Birthday Candles 2) were analyzed. They released oily bubbles with an average diameter of 5.0 mm at a rate of 4.7 bubbles s-1 , and 1.3 bubbles s-1 , respectively. Approximately 1 km away, within the GC600 seep site, two more vents (Mega Plume 1 and Mega Plume 2) were analyzed. These vents released a mixture of oily and gaseous bubbles with an average diameter of 3.9 mm at a rate of 49 bubbles s-1 , and 81 bubbles s-1 , respectively. The fifth vent at MC118 (Rudyville) released gaseous bubbles with an average diameter of 3.0 mm at a rate of 127 bubbles s-1. Pressure records at Mega Plume and Rudyville showed a diurnal tidal cycle (24.5h). Rudyville was the only vent that demonstrated any positive correlation (ρ=0.60) to the 24.5h diurnal tidal cycle. However, these observations were not conclusive regarding tidal effects on bubble release.

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Section: Study Sitementioning

confidence: 89%

Time series video analysis of bubble release processes at natural hydrocarbon seeps in the Northern Gulf of Mexico

Johansen

Todd²,

MacDonald

2017

Marine and Petroleum Geology

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“…17 The cell wall material of microbial communities indigenous to seabed methane deposits have been shown to inhibit hydrate formation. 18 Chryseobacterium sp. C14 was recovered as the most freeze−thaw-resistant isolate from a high-altitude soil community.…”

Section: ■ Introductionmentioning

confidence: 99%

“…One option is to screen ice-active bacteria for hydrate inhibition, to find a cheaper alternative to protein purification . The cell wall material of microbial communities indigenous to seabed methane deposits have been shown to inhibit hydrate formation Chryseobacterium sp.…”

Section: Introductionmentioning

confidence: 99%

Bacterial Inhibition of Methane Clathrate Hydrates Formed in a Stirred Autoclave

et al. 2012

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The potential for hydrate inhibition in a stirred autoclave at a subcooling of 2.3 K has been tested on two bacterial isolates. Chryseobacterium sp. C14 survives multiple freeze−thaw events and inhibits ice recrystallization, and Escherichia coli has neither of these properties but is a biofilm producer. Both strains showed methane hydrate inhibition, with a significant reduction in total hydrate formed. Chryseobacterium delayed hydrate nucleating time, to a similar level found for the commercial kinetic inhibitor, polyvinylpyrrolidone (PVP; 0.2 wt %). However, in the presence of E. coli, in comparison to PVP, the time to nucleation was almost tripled and the hydrate growth rate was reduced by half. Because of the variation inherent with the microbial samples, likely a result of the complexities associated with varying cell numbers and metabolic activity, numerous experiments were required. Analysis of the distinct hydrate growth profiles shown by the two bacterial strains indicated that different molecular sources were likely responsible for the observed inhibition. As a working hypothesis, it is suggested that the inhibition observed by Chryseobacterium cultures was partially due to ice recrystallization inhibition properties, while that of E. coli may be due to secreted macromolecules and the effect of biofilm.

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Introduction

Wu,

Sun,

et al. 2024

Deepwater Geohazards in the South China Sea

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Hydrate research activities that both support and derive from the monitoring station/sea-floor Observatory, Mississippi Canyon 118, northern Gulf of Mexico

Cited by 4 publications

References 40 publications

Time series video analysis of bubble release processes at natural hydrocarbon seeps in the Northern Gulf of Mexico

Time series video analysis of bubble release processes at natural hydrocarbon seeps in the Northern Gulf of Mexico

Bacterial Inhibition of Methane Clathrate Hydrates Formed in a Stirred Autoclave

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