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This content will become publicly available on August 31, 2017

Title: Short-range, overpressure-driven methane migration in coarse-grained gas hydrate reservoirs

Two methane migration mechanisms have been proposed for coarse-grained gas hydrate reservoirs: short-range diffusive gas migration and long-range advective fluid transport from depth. Herein we demonstrate that short-range fluid flow due to overpressure in marine sediments is a significant additional methane transport mechanism that allows hydrate to precipitate in large quantities in thick, coarse-grained hydrate reservoirs. Two-dimensional simulations demonstrate that this migration mechanism, short-range advective transport, can supply significant amounts of dissolved gas and is unencumbered by limitations of the other two end-member mechanisms. Here, short-range advective migration can increase the amount of methane delivered to sands as compared to the slow process of diffusion, yet it is not necessarily limited by effective porosity reduction as is typical of updip advection from a deep source.
Authors:
 [1] ;  [1] ;  [2] ;  [3]
  1. Univ. of Texas at Austin, Austin, TX (United States)
  2. The Ohio State Univ., Columbus, OH (United States)
  3. Observatory of Columbia Univ., Palisades, NY (United States)
Publication Date:
OSTI Identifier:
1314040
Grant/Contract Number:
FE0013919
Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Name: Geophysical Research Letters; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Research Org:
Univ. of Texas at Austin, Austin, TX (United States)
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Contributing Orgs:
University of Texas at Austin
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES