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Porewater Geochemical Assessment of Seismic Indications for Gas Hydrate Presence and Absence: Mahia Slope, East of New Zealand’s North Island

Author

Listed:
  • Richard B. Coffin

    (Department of Physical and Environmental Science, Texas A&M University—Corpus Christi, Corpus Christi, TX 78412, USA)

  • Gareth Crutchley

    (GEOMAR Helmholtz Centre for Ocean Research Kiel, 24103 Kiel, Germany)

  • Ingo Pecher

    (Department of Physical and Environmental Science, Texas A&M University—Corpus Christi, Corpus Christi, TX 78412, USA
    School of Environment, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand)

  • Brandon Yoza

    (Hawai’i Natural Energy Institute, University of Hawai‘i at Mānoa, Honolulu, HI 96822, USA)

  • Thomas J. Boyd

    (US Naval Research Laboratory, Code 6181, 4555 Overlook Ave., SW, Washington, DC 20001, USA)

  • Joshu Mountjoy

    (National Institute of Water and Atmosphere, Wellington 5012, New Zealand)

Abstract

We compare sediment vertical methane flux off the Mahia Peninsula, on the Hikurangi Margin, east of New Zealand’s North Island, with a combination of geochemical, multichannel seismic and sub-bottom profiler data. Stable carbon isotope data provided an overview of methane contributions to shallow sediment carbon pools. Methane varied considerably in concentration and vertical flux across stations in close proximities. At two Mahia transects, methane profiles correlated well with integrated seismic and TOPAS data for predicting vertical methane migration rates from deep to shallow sediment. However, at our “control site”, where no seismic blanking or indications of vertical gas migration were observed, geochemical data were similar to the two Mahia transect lines. This apparent mismatch between seismic and geochemistry data suggests a potential to underestimate gas hydrate volumes based on standard seismic data interpretations. To accurately assess global gas hydrate deposits, multiple approaches for initial assessment, e.g., seismic data interpretation, heatflow profiling and controlled-source electromagnetics, should be compared to geochemical sediment and porewater profiles. A more thorough data matrix will provide better accuracy in gas hydrate volume for modeling climate change and potential available energy content.

Suggested Citation

  • Richard B. Coffin & Gareth Crutchley & Ingo Pecher & Brandon Yoza & Thomas J. Boyd & Joshu Mountjoy, 2022. "Porewater Geochemical Assessment of Seismic Indications for Gas Hydrate Presence and Absence: Mahia Slope, East of New Zealand’s North Island," Energies, MDPI, vol. 15(3), pages 1-18, February.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:3:p:1233-:d:744417
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    References listed on IDEAS

    as
    1. Joseph P. Smith & Richard B. Coffin, 2014. "Methane Flux and Authigenic Carbonate in Shallow Sediments Overlying Methane Hydrate Bearing Strata in Alaminos Canyon, Gulf of Mexico," Energies, MDPI, vol. 7(9), pages 1-24, September.
    2. Richard B. Coffin & Leila J. Hamdan & Joseph P. Smith & Paula S. Rose & Rebecca E. Plummer & Brandon Yoza & Ingo Pecher & Michael T. Montgomery, 2014. "Contribution of Vertical Methane Flux to Shallow Sediment Carbon Pools across Porangahau Ridge, New Zealand," Energies, MDPI, vol. 7(8), pages 1-25, August.
    3. Li, Xiao-Sen & Xu, Chun-Gang & Zhang, Yu & Ruan, Xu-Ke & Li, Gang & Wang, Yi, 2016. "Investigation into gas production from natural gas hydrate: A review," Applied Energy, Elsevier, vol. 172(C), pages 286-322.
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