Hydrate bearing clayey sediments: Formation and gas production concepts

Jaewon Jang, J. Carlos Santamarina

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    Abstract

    Hydro-thermo-chemo and mechanically coupled processes determine hydrate morphology and control gas production from hydrate-bearing sediments. Force balance, together with mass and energy conservation analyses anchored in published data provide robust asymptotic solutions that reflect governing processes in hydrate systems. Results demonstrate that hydrate segregation in clayey sediments results in a two-material system whereby hydrate lenses are surrounded by hydrate-free water-saturated clay. Hydrate saturation can reach ≈2% by concentrating the excess dissolved gas in the pore water and ≈20% from metabolizable carbon. Higher hydrate saturations are often found in natural sediments and imply methane transport by advection or diffusion processes. Hydrate dissociation is a strongly endothermic event; the available latent heat in a reservoir can sustain significant hydrate dissociation without triggering ice formation during depressurization. The volume of hydrate expands 2-to-4 times upon dissociation or CO2[Formula presented]4 replacement. Volume expansion can be controlled to maintain lenses open and to create new open mode discontinuities that favor gas recovery. Pore size is the most critical sediment parameter for hydrate formation and gas recovery and is controlled by the smallest grains in a sediment. Therefore any characterization must carefully consider the amount of fines and their associated mineralogy.

    Original languageEnglish (US)
    Pages (from-to)235-246
    Number of pages12
    JournalMarine and Petroleum Geology
    Volume77
    DOIs
    StatePublished - Nov 1 2016

    Fingerprint

    gas production
    hydrates
    sediments
    gases
    sediment
    saturation
    gas recovery
    dissolved gas
    energy conservation
    gas
    dissociation
    discontinuity
    porewater
    advection
    mineralogy
    replacement
    methane
    ice
    clay
    lenses

    Keywords

    • Clayey sediments
    • Frozen ground
    • Gas hydrate
    • Hydrate lenses

    ASJC Scopus subject areas

    • Economic Geology
    • Geology
    • Geophysics
    • Stratigraphy
    • Oceanography

    Cite this

    Hydrate bearing clayey sediments : Formation and gas production concepts. / Jang, Jaewon; Santamarina, J. Carlos.

    In: Marine and Petroleum Geology, Vol. 77, 01.11.2016, p. 235-246.

    Research output: Contribution to journalArticle

    Jang, Jaewon ; Santamarina, J. Carlos. / Hydrate bearing clayey sediments : Formation and gas production concepts. In: Marine and Petroleum Geology. 2016 ; Vol. 77. pp. 235-246.
    @article{e65935b68fa64b4dbc47e334187f07a1,
    title = "Hydrate bearing clayey sediments: Formation and gas production concepts",
    abstract = "Hydro-thermo-chemo and mechanically coupled processes determine hydrate morphology and control gas production from hydrate-bearing sediments. Force balance, together with mass and energy conservation analyses anchored in published data provide robust asymptotic solutions that reflect governing processes in hydrate systems. Results demonstrate that hydrate segregation in clayey sediments results in a two-material system whereby hydrate lenses are surrounded by hydrate-free water-saturated clay. Hydrate saturation can reach ≈2{\%} by concentrating the excess dissolved gas in the pore water and ≈20{\%} from metabolizable carbon. Higher hydrate saturations are often found in natural sediments and imply methane transport by advection or diffusion processes. Hydrate dissociation is a strongly endothermic event; the available latent heat in a reservoir can sustain significant hydrate dissociation without triggering ice formation during depressurization. The volume of hydrate expands 2-to-4 times upon dissociation or CO2[Formula presented]4 replacement. Volume expansion can be controlled to maintain lenses open and to create new open mode discontinuities that favor gas recovery. Pore size is the most critical sediment parameter for hydrate formation and gas recovery and is controlled by the smallest grains in a sediment. Therefore any characterization must carefully consider the amount of fines and their associated mineralogy.",
    keywords = "Clayey sediments, Frozen ground, Gas hydrate, Hydrate lenses",
    author = "Jaewon Jang and Santamarina, {J. Carlos}",
    year = "2016",
    month = "11",
    day = "1",
    doi = "10.1016/j.marpetgeo.2016.06.013",
    language = "English (US)",
    volume = "77",
    pages = "235--246",
    journal = "Marine and Petroleum Geology",
    issn = "0264-8172",
    publisher = "Elsevier BV",

    }

    TY - JOUR

    T1 - Hydrate bearing clayey sediments

    T2 - Formation and gas production concepts

    AU - Jang, Jaewon

    AU - Santamarina, J. Carlos

    PY - 2016/11/1

    Y1 - 2016/11/1

    N2 - Hydro-thermo-chemo and mechanically coupled processes determine hydrate morphology and control gas production from hydrate-bearing sediments. Force balance, together with mass and energy conservation analyses anchored in published data provide robust asymptotic solutions that reflect governing processes in hydrate systems. Results demonstrate that hydrate segregation in clayey sediments results in a two-material system whereby hydrate lenses are surrounded by hydrate-free water-saturated clay. Hydrate saturation can reach ≈2% by concentrating the excess dissolved gas in the pore water and ≈20% from metabolizable carbon. Higher hydrate saturations are often found in natural sediments and imply methane transport by advection or diffusion processes. Hydrate dissociation is a strongly endothermic event; the available latent heat in a reservoir can sustain significant hydrate dissociation without triggering ice formation during depressurization. The volume of hydrate expands 2-to-4 times upon dissociation or CO2[Formula presented]4 replacement. Volume expansion can be controlled to maintain lenses open and to create new open mode discontinuities that favor gas recovery. Pore size is the most critical sediment parameter for hydrate formation and gas recovery and is controlled by the smallest grains in a sediment. Therefore any characterization must carefully consider the amount of fines and their associated mineralogy.

    AB - Hydro-thermo-chemo and mechanically coupled processes determine hydrate morphology and control gas production from hydrate-bearing sediments. Force balance, together with mass and energy conservation analyses anchored in published data provide robust asymptotic solutions that reflect governing processes in hydrate systems. Results demonstrate that hydrate segregation in clayey sediments results in a two-material system whereby hydrate lenses are surrounded by hydrate-free water-saturated clay. Hydrate saturation can reach ≈2% by concentrating the excess dissolved gas in the pore water and ≈20% from metabolizable carbon. Higher hydrate saturations are often found in natural sediments and imply methane transport by advection or diffusion processes. Hydrate dissociation is a strongly endothermic event; the available latent heat in a reservoir can sustain significant hydrate dissociation without triggering ice formation during depressurization. The volume of hydrate expands 2-to-4 times upon dissociation or CO2[Formula presented]4 replacement. Volume expansion can be controlled to maintain lenses open and to create new open mode discontinuities that favor gas recovery. Pore size is the most critical sediment parameter for hydrate formation and gas recovery and is controlled by the smallest grains in a sediment. Therefore any characterization must carefully consider the amount of fines and their associated mineralogy.

    KW - Clayey sediments

    KW - Frozen ground

    KW - Gas hydrate

    KW - Hydrate lenses

    UR - http://www.scopus.com/inward/record.url?scp=84976292724&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84976292724&partnerID=8YFLogxK

    U2 - 10.1016/j.marpetgeo.2016.06.013

    DO - 10.1016/j.marpetgeo.2016.06.013

    M3 - Article

    AN - SCOPUS:84976292724

    VL - 77

    SP - 235

    EP - 246

    JO - Marine and Petroleum Geology

    JF - Marine and Petroleum Geology

    SN - 0264-8172

    ER -