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Extent of gas hydrate filled fracture planes: Implications for in situ methanogenesis and resource potential
Author(s) -
Cook Ann E.,
Goldberg David
Publication year - 2008
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2008gl034587
Subject(s) - clathrate hydrate , borehole , geology , methane , fracture (geology) , hydrate , drilling , submarine pipeline , petroleum engineering , petrology , mineralogy , geotechnical engineering , materials science , chemistry , organic chemistry , metallurgy
High‐angle gas hydrate filled fracture planes were identified along a 31 m interval in logging while drilling images in two holes located ∼11 m apart drilled during the Indian National Gas Hydrate Program Expedition 01, offshore India. Using Monte Carlo simulations to account for uncertainty in hole location, hole deviation, strike and dip, we assert with 95% confidence that the fracture planes in the two holes are not the same. The gas hydrate filled fracture planes likely only extend a few meters laterally from each borehole and occur in an isolated interval in the middle of the gas hydrate stability zone. This suggests gas generated microbially within in the gas hydrate stability zone may have supplied the gas hydrate‐filled fracture interval. Production of methane from these reservoirs using conventional methods may be quite challenging.