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  4. Microbial-induced carbonate precipitation applicability with the methane hydrate-bearing layer microbe
 
research article

Microbial-induced carbonate precipitation applicability with the methane hydrate-bearing layer microbe

Hata, Toshiro
•
Saracho, Alexandra Clara  
•
Haigh, Stuart K.
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September 1, 2020
Journal Of Natural Gas Science And Engineering

Production of methane gas from the methane-hydrate-bearing layer below the deep-ocean floor is expected to be crucial in the future of energy resources worldwide. During the methane gas-production phase from the methane hydrate with the depressurisation method, the depressurising zone around the production well will lose strength, causing a potential geohazard. In this study, a bio-mediated treatment to reinforce the methane hydrate layers is proposed. A urease-producing bacterium, Sporosarcina newyorkensis, was isolated for the first time from a pressure core sampled from the Nankai Trough seabed methane-hydrate-bearing layer in Japan. This newly isolated species can survive deep-seabed environments and also enhance the population under nutrient-rich conditions. In addition, it is uniquely characterised with higher urease activities under low-temperature conditions in comparison to the well-known bacterium S. pasteurii. The results of triaxial tests suggest that this bacterium can catalyse the precipitation of calcium carbonate through urea hydrolysis, which enhances the soil strength below the ocean floor and hence reinforces the production well. This will not only make methane gas extraction safer but may also reduce sand production in the well, making extraction operations more efficient and cost effective.

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Type
research article
DOI
10.1016/j.jngse.2020.103490
Web of Science ID

WOS:000571076000002

Author(s)
Hata, Toshiro
Saracho, Alexandra Clara  
Haigh, Stuart K.
Yoneda, Jun
Yamamoto, Koji
Date Issued

2020-09-01

Publisher

ELSEVIER SCI LTD

Published in
Journal Of Natural Gas Science And Engineering
Volume

81

Article Number

103490

Subjects

Energy & Fuels

•

Engineering, Chemical

•

Engineering

•

ground improvement

•

soil stabilisation

•

laboratory tests

•

pressure core

•

gas hydrate

•

pressure-coring system

•

sp-nov

•

sporosarcina

•

micp

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMS  
Available on Infoscience
October 7, 2020
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/172267
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