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GEOREF RECORD

Pressure coring operations during the University of Texas-Gulf of Mexico 2-1 (UT-GOM2-1) Hydrate Pressure Coring Expedition in Green Canyon Block 955, northern Gulf of Mexico

Carla Thomas, Stephen C. Phillips, Peter B. Flemings, Manasij Santra, Helen Hammon, Timothy S. Collett, Ann E. Cook, Tom Pettigrew, Mike Mimitz, Melanie Holland and Peter Schultheiss
Pressure coring operations during the University of Texas-Gulf of Mexico 2-1 (UT-GOM2-1) Hydrate Pressure Coring Expedition in Green Canyon Block 955, northern Gulf of Mexico (in Gas hydrates in Green Canyon Block 955, deep-water Gulf of Mexico; Part 1, Anonymous)
AAPG Bulletin (September 2020) 104 (9): 1877-1901

Abstract

In May 2017, The University of Texas Hydrate Pressure Coring Expedition Gulf of Mexico 2-1 (UT-GOM2-1) drilled two adjacent holes in Green Canyon Block 955 in the deep-water Gulf of Mexico as part of The University of Texas at Austin and US Department of Energy Deepwater Methane Hydrate Characterization and Scientific Assessment. Expedition operations included testing two configurations of a rotary pressure-coring tool in a gas hydrate-bearing formation. In the first hole, an extended core barrel (cutting shoe) configuration of the Pressure Coring Tool with Ball Valve (PCTB-CS) was deployed, and in the second hole, the PCTB face bit configuration (PCTB-FB) was deployed. The PCTB-CS successfully recovered and maintained pressure for only one core out of eight deployments. A series of incremental modifications were made during and after the PCTB-CS deployment period that impacted the operations of the subsequent PCTB-FB deployments. Thus, in the second hole, the PCTB-FB successfully recovered and maintained pressure within the hydrate stability zone for 11 cores out of 13 deployments. The PCTB cored gas hydrate-bearing sandy silt interbedded with non-hydrate-bearing clayey silt within the main reservoir. The PCTB also recovered long intervals of unbroken, high-quality core with preserved sedimentary structures. We recovered one pressure core 130 m (437 ft) above the main hydrate reservoir in the silty clay. Pressure coring is the only available technology for recovering intact cores from sediment that is normally disturbed by gas expansion, dissolution, or dissociation; this allows a wide range of scientific measurements to be obtained with minimal disturbance to the core sediment fabric. Analysis of pressure cores has the potential to illuminate the in situ properties, gas saturation, and gas composition of a wide range of reservoirs including unconventional shale systems.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 104
Serial Issue: 9
Title: Pressure coring operations during the University of Texas-Gulf of Mexico 2-1 (UT-GOM2-1) Hydrate Pressure Coring Expedition in Green Canyon Block 955, northern Gulf of Mexico
Title: Gas hydrates in Green Canyon Block 955, deep-water Gulf of Mexico; Part 1
Affiliation: University of Texas at Austin, Institute for Geophysics, Austin, TX, United States
Pages: 1877-1901
Published: 20200915
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
Accession Number: 2020-077270
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N18°00'00" - N30°04'00", W98°00'00" - W80°30'00"
Secondary Affiliation: U. S. Geological Survey, USA, United StatesOhio State University, USA, United StatesPettigrew Engineering, USA, United StatesGeotek Coring, Salt Lake City, UT, USA, United StatesGeotek, Daventry, GBR, United Kingdom
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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