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Pressure coring a Gulf of Mexico deep-water turbidite gas hydrate reservoir; initial results from The University of Texas-Gulf of Mexico 2-1 (UT-GOM2-1) Hydrate Pressure Coring Expedition

Peter B. Flemings, Stephen C. Phillips, Ray Boswell, Timothy S. Collett, Ann E. Cook, Tiannong Dong, Matthew Frye, David S. Goldberg, Gilles Guerin, Melanie E. Holland, Junbong Jang, Kevin Meazell, Jamie Morrison, Joshua I. O'Connell, Ethan G. Petrou, Tom Pettigrew, Peter J. Polito, Alexey Portnov, Manasij Santra, Peter J. Schultheiss, Yongkoo Seol, William Shedd, Evan A. Solomon, Carla M. Thomas, William F. Waite and Kehua You
Pressure coring a Gulf of Mexico deep-water turbidite gas hydrate reservoir; initial results from The University of Texas-Gulf of Mexico 2-1 (UT-GOM2-1) Hydrate Pressure Coring Expedition (in Gas hydrates in Green Canyon Block 955, deep-water Gulf of Mexico; Part 1, Anonymous)
AAPG Bulletin (September 2020) 104 (9): 1847-1876

Abstract

The University of Texas Hydrate Pressure Coring Expedition (UT-GOM2-1) recovered cores at near in situ formation pressures from a gas hydrate reservoir composed of sandy silt and clayey silt beds in Green Canyon Block 955 in the deep-water Gulf of Mexico. The expedition results are synthesized and linked to other detailed analyses presented in this volume. Millimeter- to meter-scale beds of sandy silt and clayey silt are interbedded on the levee of a turbidite channel. The hydrate saturation (the volume fraction of the pore space occupied by hydrate) in the sandy silts ranges from 79% to 93%, and there is little to no hydrate in the clayey silt. Gas from the hydrates is composed of nearly pure methane (99.99%) with less than 400 ppm of ethane or heavier hydrocarbons. The delta 13C values from the methane are depleted (-60 ppm to -65 ppm Vienna Peedee belemnite), and it is interpreted that the gases were largely generated by primary microbial methanogenesis but that low concentrations of propane or heavier hydrocarbons record at least trace thermogenic components. The in situ pore-water salinity is very close to that of seawater. This suggests that the excess salinity generated during hydrate formation diffused away because the hydrate formed slowly or because it formed long ago. Because the sandy silt deposits have high hydrate concentration and high intrinsic permeability, they may represent a class of reservoir that can be economically developed. Results from this expedition will inform a new generation of reservoir simulation models that will illuminate how these reservoirs might be best produced.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 104
Serial Issue: 9
Title: Pressure coring a Gulf of Mexico deep-water turbidite gas hydrate reservoir; initial results from The University of Texas-Gulf of Mexico 2-1 (UT-GOM2-1) Hydrate Pressure Coring Expedition
Title: Gas hydrates in Green Canyon Block 955, deep-water Gulf of Mexico; Part 1
Affiliation: University of Texas at Austin, Institute for Geophysics and Department of Geological Sciences, Austin, TX, United States
Pages: 1847-1876
Published: 20200915
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
Accession Number: 2020-077269
Categories: Economic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N18°00'00" - N30°04'00", W98°00'00" - W80°30'00"
Secondary Affiliation: National Energy Technology Laboratory, USA, United StatesU. S. Geological Survey, USA, United StatesOhio State University, USA, United StatesBureau of Ocean Energy Management, USA, United StatesLamont-Doherty Earth Observatory, USA, United StatesGeotek, GBR, United KingdomIntegrated Statistics, USA, United StatesPettigrew Engineering, USA, United StatesNational Energy Technology Laboratory (NETL), USA, United StatesBureau of Ocean Energy Management (BOEM), USA, United StatesUniversity of Washington, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States
Update Code: 2020
Program Name: USGSOPNon-USGS publications with USGS authors
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