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Title: Gas hydrate reservoirs and gas migration mechanisms in the Terrebonne Basin, Gulf of Mexico

Abstract

Here, the interactions of microbial methane generation in fine-grained clay-rich sediments, methane migration, and gas hydrate accumulation in coarse-grained, sand-rich sediments are not yet fully understood. The Terrebonne Basin in the northern Gulf of Mexico provides an ideal setting to investigate the migration of methane resulting in the formation of hydrate in thin sand units interbedded with fractured muds. Using 3D seismic and well log data, we have identified several previously unidentified hydrate bearing units in the Terrebonne Basin. Two units are >100 m- thick fine-grained clay-rich units where gas hydrate occurs in near-vertical fractures. In some locations, these fine-grained units lack fracture features, and they contain 1-4-m thick hydrate bearing-sands. In addition, several other thin sand units were identified that contain gas hydrate, including one sand that was intersected by a well at the location of a discontinuous bottom-simulating reflector. Using correlation of well log data to seismic data, we have mapped and described these new units in detail across the extent of the available data, allowing us to determine the variation of seismic amplitudes and investigate the distribution of free gas and/or hydrate. We present several potential source-reservoir scenarios between the thick fractured mud units and thin hydratemore » bearing sands. We observe that hydrate preferentially forms within thin sand layers rather than fractures when sands are present in larger marine mud units. Based on regional mapping showing the patchy lateral extent of the thin sand layers, we propose that diffusive methane migration or short-migration of microbially generated methane from the marine mud units led to the formation of hydrate in these thin sands, as discontinuous sands would not be conducive to long-range migration of methane from deeper reservoirs.« less

Authors:
ORCiD logo [1];  [1];  [2];  [2];  [3];  [2];  [2]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. Univ. of Texas at Austin, Austin, TX (United States)
  3. Lamont-Doherty Earth Observatory, Palisades, NY (United States)
Publication Date:
Research Org.:
The Ohio State Univ., Columbus, OH (United States); Univ. of Texas, Austin, TX (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1373260
Alternate Identifier(s):
OSTI ID: 1549621
Grant/Contract Number:  
FE0013919; FE0023919
Resource Type:
Accepted Manuscript
Journal Name:
Marine and Petroleum Geology
Additional Journal Information:
Journal Volume: 86; Journal Issue: C; Journal ID: ISSN 0264-8172
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
03 NATURAL GAS; 58 GEOSCIENCES; seismic amplitude; hydrate; methane migration; sand; diffusion; advection

Citation Formats

Hillman, Jess I. T., Cook, Ann E., Daigle, Hugh, Nole, Michael, Malinverno, Alberto, Meazell, Kevin, and Flemings, Peter B. Gas hydrate reservoirs and gas migration mechanisms in the Terrebonne Basin, Gulf of Mexico. United States: N. p., 2017. Web. https://doi.org/10.1016/j.marpetgeo.2017.07.029.
Hillman, Jess I. T., Cook, Ann E., Daigle, Hugh, Nole, Michael, Malinverno, Alberto, Meazell, Kevin, & Flemings, Peter B. Gas hydrate reservoirs and gas migration mechanisms in the Terrebonne Basin, Gulf of Mexico. United States. https://doi.org/10.1016/j.marpetgeo.2017.07.029
Hillman, Jess I. T., Cook, Ann E., Daigle, Hugh, Nole, Michael, Malinverno, Alberto, Meazell, Kevin, and Flemings, Peter B. Thu . "Gas hydrate reservoirs and gas migration mechanisms in the Terrebonne Basin, Gulf of Mexico". United States. https://doi.org/10.1016/j.marpetgeo.2017.07.029. https://www.osti.gov/servlets/purl/1373260.
@article{osti_1373260,
title = {Gas hydrate reservoirs and gas migration mechanisms in the Terrebonne Basin, Gulf of Mexico},
author = {Hillman, Jess I. T. and Cook, Ann E. and Daigle, Hugh and Nole, Michael and Malinverno, Alberto and Meazell, Kevin and Flemings, Peter B.},
abstractNote = {Here, the interactions of microbial methane generation in fine-grained clay-rich sediments, methane migration, and gas hydrate accumulation in coarse-grained, sand-rich sediments are not yet fully understood. The Terrebonne Basin in the northern Gulf of Mexico provides an ideal setting to investigate the migration of methane resulting in the formation of hydrate in thin sand units interbedded with fractured muds. Using 3D seismic and well log data, we have identified several previously unidentified hydrate bearing units in the Terrebonne Basin. Two units are >100 m- thick fine-grained clay-rich units where gas hydrate occurs in near-vertical fractures. In some locations, these fine-grained units lack fracture features, and they contain 1-4-m thick hydrate bearing-sands. In addition, several other thin sand units were identified that contain gas hydrate, including one sand that was intersected by a well at the location of a discontinuous bottom-simulating reflector. Using correlation of well log data to seismic data, we have mapped and described these new units in detail across the extent of the available data, allowing us to determine the variation of seismic amplitudes and investigate the distribution of free gas and/or hydrate. We present several potential source-reservoir scenarios between the thick fractured mud units and thin hydrate bearing sands. We observe that hydrate preferentially forms within thin sand layers rather than fractures when sands are present in larger marine mud units. Based on regional mapping showing the patchy lateral extent of the thin sand layers, we propose that diffusive methane migration or short-migration of microbially generated methane from the marine mud units led to the formation of hydrate in these thin sands, as discontinuous sands would not be conducive to long-range migration of methane from deeper reservoirs.},
doi = {10.1016/j.marpetgeo.2017.07.029},
journal = {Marine and Petroleum Geology},
number = C,
volume = 86,
place = {United States},
year = {2017},
month = {7}
}

Journal Article:

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Cited by: 5 works
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    Works referencing / citing this record:

    The geological process for gas hydrate formation in the Qilian Mountain permafrost
    journal, April 2019


    The Volume of Gas Hydrate‐Bound Gas in the Northern Gulf of Mexico
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