scholarly journals Gas composition and isotopic geochemistry of cuttings, core, and gas hydrate from the JAPEX/JNOC/GSC Mallik 2L-38 gas hydrate research well

1999 ◽  
Author(s):  
T D Lorenson ◽  
M J Whiticar ◽  
A Waseda ◽  
S R Dallimore ◽  
T S Collett
Keyword(s):  
Gas Hydrate ◽  
Gas Composition ◽  
Isotopic Geochemistry

Insights into CO2 Capture by Flue Gas Hydrate Formation: Gas Composition Evolution in Systems Containing Gas Hydrates and Gas Mixtures at Stable Pressures

2018 ◽  
Vol 6 (5) ◽  
pp. 5732-5736 ◽  
Author(s):  
Aliakbar Hassanpouryouzband ◽  
Jinhai Yang ◽  
Bahman Tohidi ◽  
Evgeny Chuvilin ◽  
Vladimir Istomin ◽  
...  
Keyword(s):  
Co2 Capture ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
Flue Gas ◽  
Hydrate Formation ◽  
Gas Mixtures ◽  
Gas Composition ◽  
Gas Hydrate Formation

scholarly journals Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 3039
Author(s):  
Mengdi Pan ◽  
Judith M. Schicks
Keyword(s):  
Gas Hydrates ◽  
Gas Hydrate ◽  
Formation Process ◽  
Gas Flow ◽  
Hydrate Formation ◽  
Experimental Investigations ◽  
Gas Composition ◽  
Mixed Gas ◽  
Hydrate Phase ◽  
Gas Supply

Natural gas hydrate occurrences contain predominantly methane; however, there are increasing reports of complex mixed gas hydrates and coexisting hydrate phases. Changes in the feed gas composition due to the preferred incorporation of certain components into the hydrate phase and an inadequate gas supply is often assumed to be the cause of coexisting hydrate phases. This could also be the case for the gas hydrate system in Qilian Mountain permafrost (QMP), which is mainly controlled by pores and fractures with complex gas compositions. This study is dedicated to the experimental investigations on the formation process of mixed gas hydrates based on the reservoir conditions in QMP. Hydrates were synthesized from water and a gas mixture under different gas supply conditions to study the effects on the hydrate formation process. In situ Raman spectroscopic measurements and microscopic observations were applied to record changes in both gas and hydrate phase over the whole formation process. The results demonstrated the effects of gas flow on the composition of the resulting hydrate phase, indicating a competitive enclathration of guest molecules into the hydrate lattice depending on their properties. Another observation was that despite significant changes in the gas composition, no coexisting hydrate phases were formed.

scholarly journals Supplemental Material: Diverse gas composition controls the Moby-Dick gas hydrate system in the Gulf of Mexico

2021 ◽  
Author(s):  
Alexey Portnov ◽  
et al.
Keyword(s):  
Gas Chromatography ◽  
Gulf Of Mexico ◽  
Gas Hydrate ◽  
Velocity Model ◽  
Well Log ◽  
Gas Composition ◽  
Geothermal Gradients ◽  
Moby Dick ◽  
The Public

Information about the sources and processing characteristics of the public seismic, well log, and gas chromatography data; and time-depth conversion parameters, velocity model, and calculations of geothermal gradients.<br>

scholarly journals Supplemental Material: Diverse gas composition controls the Moby-Dick gas hydrate system in the Gulf of Mexico

2021 ◽  
Author(s):  
Alexey Portnov ◽  
et al.
Keyword(s):  
Gas Chromatography ◽  
Gulf Of Mexico ◽  
Gas Hydrate ◽  
Velocity Model ◽  
Well Log ◽  
Gas Composition ◽  
Geothermal Gradients ◽  
Moby Dick ◽  
The Public

Information about the sources and processing characteristics of the public seismic, well log, and gas chromatography data; and time-depth conversion parameters, velocity model, and calculations of geothermal gradients.<br>

scholarly journals Diverse gas composition controls the Moby-Dick gas hydrate system in the Gulf of Mexico

Geology ◽  
2021 ◽  
Author(s):  
Alexey Portnov ◽  
A.E. Cook ◽  
S. Vadakkepuliyambatta
Keyword(s):  
Gulf Of Mexico ◽  
Gas Hydrate ◽  
Seismic Data ◽  
Gas Composition ◽  
The West ◽  
Moby Dick ◽  
Basin Scale ◽  
Bottom Simulating Reflection ◽  
Marine Basins ◽  
Hydrate Stability

In marine basins, gas hydrate systems are usually identified by a bottom simulating reflection (BSR) that parallels the seafloor and coincides with the base of the gas hydrate stability zone (GHSZ). We present a newly discovered gas hydrate system, Moby-Dick, located in the Ship Basin in the northern Gulf of Mexico. In the seismic data, we observe a channel-levee complex with a consistent phase reversal and a BSR extending over an area of ~14.2 km2, strongly suggesting the presence of gas hydrate. In contrast to classical observations, the Moby-Dick BSR abnormally shoals 150 m toward the seafloor from west to east, which contradicts the northward-shallowing seafloor. We argue that the likely cause of the shoaling BSR is a gradually changing gas mix across the basin, with gas containing heavier hydrocarbons in the west transitioning to methane gas in the east. Our study indicates that such abnormal BSRs can be controlled by gradual changes in the gas mix influencing the shape of the GHSZ over kilometers on a basin scale.

scholarly journals Instrumental Methods for Cage Occupancy Estimation of Gas Hydrate

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 485
Author(s):  
Wenjiu Cai ◽  
Xin Huang ◽  
Hailong Lu
Keyword(s):  
Gas Hydrate ◽  
Storage Capacity ◽  
Gas Composition ◽  
Natural Gas Hydrate ◽  
Guest Molecules ◽  
Hydrate Reservoir ◽  
Occupancy Estimation ◽  
Gas Hydrate Reservoir ◽  
Gas Molecules ◽  
Instrumental Methods

Studies revealed that gas hydrate cages, especially small cages, are incompletely filled with guest gas molecules, primarily associated with pressure and gas composition. The ratio of hydrate cages occupied by guest molecules, defined as cage occupancy, is a critical parameter to estimate the resource amount of a natural gas hydrate reservoir and evaluate the storage capacity of methane or hydrogen hydrate as an energy storage medium and carbon dioxide hydrate as a carbon sequestration matrix. As the result, methods have been developed to investigate the cage occupancy of gas hydrate. In this review, several instrument methods widely applied for gas hydrate analysis are introduced, including Raman, NMR, XRD, neutron diffraction, and the approaches to estimate cage occupancy are summarized.

Sign in / Sign up

Export Citation Format

Share Document