Constraints on the fluid supply rate into and through gas hydrate reservoir systems as inferred from pore-water chloride and in situ temperature profiles, Krishna-Godavari Basin, India

NGHP Expedition JAMSTEC Science Team

研究成果: ジャーナルへの寄稿学術誌査読

6 被引用数 (Scopus)

抄録

We estimate the rate of upward pore fluid flow and chlorinity (Cl) concentrations at depth through a joint analysis of Cl concentration and temperature versus depth profiles obtained from gas hydrate related test sites drilled and cored in the Krishna-Godavari Basin off the eastern coast of India. Cl, measured on conventional core samples, decreases with depth at all sites but some of the Clprofiles show a prominent convex shape, whereas in situ temperature profiles, obtained by the Advanced Piston Coring Temperature probe, are mostly linear at all sites established during the National Gas Hydrate Program 02 Expedition (NGHP-02). Assuming a one-dimensional, time-dependent model for the advection of pore fluid including the sedimentation effect and depth-dependent diffusivity, we estimate darcy velocity and the Cl concentrations at depth. The best-fit darcy velocity of 1.2–1.6 × 10−11 m/s was estimated for the sites along the crest of the regional anticlinal structure in the NGHP-02 Area B, which was significantly faster than those on the flanks of the anticline. Because the thermal diffusion coefficient is much larger than the chloride ion diffusion coefficient, estimated darcy velocities are not great enough to generate nonlinear temperature profiles with depth, which is consistent with observed linear thermal profiles.

本文言語英語
ページ(範囲)368-376
ページ数9
ジャーナルMarine and Petroleum Geology
108
DOI
出版ステータス出版済み - 10月 2019
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 海洋学
  • 地球物理学
  • 地質学
  • 経済地質学
  • 層序学

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