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Critical pressure and multiphase flow in Blake Ridge gas hydrates

Geology

By:
, , and
DOI: 10.1130/G19863.1

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Abstract

We use core porosity, consolidation experiments, pressure core sampler data, and capillary pressure measurements to predict water pressures that are 70% of the lithostatic stress, and gas pressures that equal the lithostatic stress beneath the methane hydrate layer at Ocean Drilling Program Site 997, Blake Ridge, offshore North Carolina. A 29-m-thick interconnected free-gas column is trapped beneath the low-permeability hydrate layer. We propose that lithostatic gas pressure is dilating fractures and gas is migrating through the methane hydrate layer. Overpressured gas and water within methane hydrate reservoirs limit the amount of free gas trapped and may rapidly export methane to the seafloor.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Critical pressure and multiphase flow in Blake Ridge gas hydrates
Series title:
Geology
DOI:
10.1130/G19863.1
Volume
31
Issue:
12
Year Published:
2003
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geology
First page:
1057
Last page:
1060
Number of Pages:
4