Journal
MARINE AND PETROLEUM GEOLOGY
Volume 58, Issue -, Pages 278-291Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.marpetgeo.2014.04.013
Keywords
Gas hydrate; Fractures; Offshore India; Gulf of Mexico
Categories
Funding
- Oil Industry Development Board
- Oil and Natural Gas Corporation Ltd.
- GAIL (India) Ltd.
- Oil India Ltd.
- NGHP: MoPNG
- DGH
- ONGC
- GAIL
- OIL
- NIO
- NIOT
- RIL
- USDOE [DE-FE0009949]
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We present a review of the geophysical and petrophysical properties of gas hydrate-filled fracture sites that are not associated with a gas vent or chimney from the Indian National Gas Hydrate Program Expedition 01 and the Gulf of Mexico Gas Hydrate Joint Industry Project Legs I & II. We analyzed logging-while drilling (LWD) resistivity images, well logs and coring information at eight of these sites and found in all cases that the gas hydrate-filled fractures occurred in fine-grained sediments, were near-vertical, and were generally oriented in the same direction at each site. In addition, resistivity was the only physical property always affected by presence of near-vertical gas hydrate-filled fractures, though in one case only the LWD resistivity image detected the presence of gas hydrate. Gas hydrate-filled fractures did not intersect the base of the gas hydrate stability zone at the location of the wellbore at any of the sites. We suggest that at non-vent/non-chimney sites the methane occupying the gas hydrate is likely produced microbially in situ and is not sourced from below. (C) 2014 Elsevier Ltd. All rights reserved.
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