Mapping gas Hydrate Systems in the Gulf of Mexico Using Marine CSEM

2014 ◽  
Author(s):  
Karen Weitemeyer ◽  
Steven Constable ◽  
Kerry Key
Keyword(s):  
Gulf Of Mexico ◽  
Gas Hydrate ◽  
Marine Csem

Thermal and visual time-series at a seafloor gas hydrate deposit on the Gulf of Mexico slope

2005 ◽  
Vol 233 (1-2) ◽  
pp. 45-59 ◽  
Author(s):  
I MACDONALD ◽  
L BENDER ◽  
M VARDARO ◽  
B BERNARD ◽  
J BROOKS
Keyword(s):  
Time Series ◽  
Gulf Of Mexico ◽  
Gas Hydrate ◽  
Hydrate Deposit

Potentially Large Subsurface Gas Hydrate Bodies in the Mexican Ridges, Southwestern Gulf of Mexico

2021 ◽  
pp. 1-29
Author(s):  
Papia Nandi ◽  
Patrick Fulton ◽  
James Dale
Keyword(s):  
Gulf Of Mexico ◽  
Gas Hydrate ◽  
Seismic Data ◽  
Poor Quality ◽  
Reflection Point ◽  
Seismic Reflection Data ◽  
Reflection Data ◽  
High Impedance ◽  
Acoustic Velocities ◽  
Seismic Images

As rising ocean temperatures can destabilize gas hydrate, identifying and characterizing large shallow hydrate bodies is increasingly important in order to understand their hazard potential. In the southwestern Gulf of Mexico, reanalysis of 3D seismic reflection data reveals evidence for the presence of six potentially large gas hydrate bodies located at shallow depths below the seafloor. We originally interpreted these bodies as salt, as they share common visual characteristics on seismic data with shallow allochthonous salt bodies, including high-impedance boundaries and homogenous interiors with very little acoustic reflectivity. However, when seismic images are constructed using acoustic velocities associated with salt, the resulting images were of poor quality containing excessive moveout in common reflection point (CRP) offset image gathers. Further investigation reveals that using lower-valued acoustic velocities results in higher quality images with little or no moveout. We believe that these lower acoustic values are representative of gas hydrate and not of salt. Directly underneath these bodies lies a zone of poor reflectivity, which is both typical and expected under hydrate. Observations of gas in a nearby well, other indicators of hydrate in the vicinity, and regional geologic context, all support the interpretation that these large bodies are composed of hydrate. The total equivalent volume of gas within these bodies is estimated to potentially be as large as 1.5 gigatons or 10.5 TCF, considering uncertainty for estimates of porosity and saturation, comparable to the entire proven natural gas reserves of Trinidad and Tobago in 2019.

Late Pleistocene–Holocene sedimentation surrounding an active seafloor gas-hydrate and cold-seep field on the Northern Gulf of Mexico Slope

2010 ◽  
Vol 278 (1-4) ◽  
pp. 43-53 ◽  
Author(s):  
Wesley C. Ingram ◽  
Stephen R. Meyers ◽  
Charlotte A. Brunner ◽  
Christopher S. Martens
Keyword(s):  
Gulf Of Mexico ◽  
Late Pleistocene ◽  
Gas Hydrate ◽  
Cold Seep ◽  
Northern Gulf Of Mexico

Gas hydrate and crude oil from the Mississippi Fan Foldbelt, downdip Gulf of Mexico Salt Basin: significance to petroleum system

2001 ◽  
Vol 32 (8) ◽  
pp. 999-1008 ◽  
Author(s):  
Roger Sassen ◽  
Stephen T Sweet ◽  
Debra A DeFreitas ◽  
J.Alejandro Morelos ◽  
Alexei V Milkov
Keyword(s):  
Gulf Of Mexico ◽  
Crude Oil ◽  
Gas Hydrate ◽  
Petroleum System

scholarly journals Characterization of Microbial Community Structure in Gulf of Mexico Gas Hydrates: Comparative Analysis of DNA- and RNA-Derived Clone Libraries

2005 ◽  
Vol 71 (6) ◽  
pp. 3235-3247 ◽  
Author(s):  
Heath J. Mills ◽  
Robert J. Martinez ◽  
Sandra Story ◽  
Patricia A. Sobecky
Keyword(s):  
Phylogenetic Analysis ◽  
Microbial Community ◽  
Gulf Of Mexico ◽  
Gas Hydrate ◽  
Phylogenetic Analyses ◽  
Active Fraction ◽  
Clone Libraries ◽  
Dna And Rna ◽  
Rna And Dna

ABSTRACT The characterization of microbial assemblages within solid gas hydrate, especially those that may be physiologically active under in situ hydrate conditions, is essential to gain a better understanding of the effects and contributions of microbial activities in Gulf of Mexico (GoM) hydrate ecosystems. In this study, the composition of the Bacteria and Archaea communities was determined by 16S rRNA phylogenetic analyses of clone libraries derived from RNA and DNA extracted from sediment-entrained hydrate (SEH) and interior hydrate (IH). The hydrate was recovered from an exposed mound located in the northern GoM continental slope with a hydrate chipper designed for use on the manned-submersible Johnson Sea Link (water depth, 550 m). Previous geochemical analyses indicated that there was increased metabolic activity in the SEH compared to the IH layer (B. N. Orcutt, A. Boetius, S. K. Lugo, I. R. Macdonald, V. A. Samarkin, and S. Joye, Chem. Geol. 205:239-251). Phylogenetic analysis of RNA- and DNA-derived clones indicated that there was greater diversity in the SEH libraries than in the IH libraries. A majority of the clones obtained from the metabolically active fraction of the microbial community were most closely related to putative sulfate-reducing bacteria and anaerobic methane-oxidizing archaea. Several novel bacterial and archaeal phylotypes for which there were no previously identified closely related cultured isolates were detected in the RNA- and DNA-derived clone libraries. This study was the first phylogenetic analysis of the metabolically active fraction of the microbial community extant in the distinct SEH and IH layers of GoM gas hydrate.

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