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Book Chapter

Water Permeability of Porous Media Containing Methane Hydrate as Controlled by the Methane-hydrate Growth Process

By
Hideki Minagawa
Hideki Minagawa
National Institute of Advanced Industrial Science and Technology (AIST), Sapporo, Japan
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Ryo Ohmura
Ryo Ohmura
National Institute of Advanced Industrial Science and Technology (AIST), Sapporo, Japan
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Yasushi Kamata
Yasushi Kamata
National Institute of Advanced Industrial Science and Technology (AIST), Sapporo, Japan
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Jiro Nagao
Jiro Nagao
National Institute of Advanced Industrial Science and Technology (AIST), Sapporo, Japan
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Takao Ebinuma
Takao Ebinuma
National Institute of Advanced Industrial Science and Technology (AIST), Sapporo, Japan
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Hideo Narita
Hideo Narita
National Institute of Advanced Industrial Science and Technology (AIST), Sapporo, Japan
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Yoshihiro Masuda
Yoshihiro Masuda
Department of Geosystem Engineering, School of Engineering, University of Tokyo, Tokyo, Japan
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Published:
January 01, 2009

Abstract

This chapter seeks to clarify the relation between fluid permeability and methane-hydrate saturation (Sh). The ultimate purpose is to estimate the theoretical expression by the equation K = K0(1 Sh)N (where K0 is the apparent permeability at Sh = 0 and N is a constant) for input into methane-hydrate numerical simulators. However, the permeability of hydrate-bearing sediment strongly depends on the hydrate saturation, grain-size distribution, porosity, pore-size distribution, hydrate formation method, and so on. To clarify the relation between the permeability and methane-hydrate saturation, we measured the water permeability of methane-hydrate-bearing sediments with different hydrate saturations for three contrasting methane-hydrate formation methods: (1) the connate water reaction method, (2) the gas diffusion method, and the (3) cementing method. The results demonstrate that the rate of decrease in the apparent water permeability (AWP) with increasing methane-hydrate saturation differs for each method of gas-hydrate formation. In addition, the values of K and N in the theoretical expression K = K0(1 Sh)N were estimated for each production method, and a different N value was obtained for each hydrate formation method. It is apparent that the method of gas-hydrate formation leads to a contrasting geometry of methane-hydrate growth at the pore scale and in turn affects the macroscopic AWP saturation relations.

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Contents

AAPG Memoir

Natural Gas Hydrates—Energy Resource Potential and Associated Geologic Hazards

T. Collett
T. Collett
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A. Johnson
A. Johnson
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C. Knapp
C. Knapp
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R. Boswell
R. Boswell
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American Association of Petroleum Geologists
Volume
89
ISBN electronic:
9781629810270
Publication date:
January 01, 2009

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