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A predictive numerical model for potential mapping of the gas hydrate stability zone in the Gulf of Cadiz

León Buendía, Ricardo Fco. and Somoza Losada, Luis and Giménez Moreno, Carmen Julia and Dabrio, Cristino J. and Ercilla, Gemma and Praeg, Daniel and Díaz del Río, Víctor and Gómez Delgado, Montserrat (2009) A predictive numerical model for potential mapping of the gas hydrate stability zone in the Gulf of Cadiz. Marine and Petroleum Geology, 26 . pp. 1564-1579. ISSN 0264-8172

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Abstract

This paper presents a computational model for mapping the regional 3D distribution in which seafloor
gas hydrates would be stable, that is carried out in a Geographical Information System (GIS) environment.
The construction of the model is comprised of three primary steps, namely: (1) the construction of
surfaces for the various variables based on available 3D data (seafloor temperature, geothermal gradient
and depth-pressure); (2) the calculation of the gas function equilibrium functions for the various
hydrocarbon compositions reported from hydrate and sediment samples; and (3) the calculation of the
thickness of the hydrate stability zone. The solution is based on a transcendental function, which is
solved iteratively in a GIS environment.
The model has been applied in the northernmost continental slope of the Gulf of Cadiz, an area where an
abundant supply for hydrate formation, such as extensive hydrocarbon seeps, diapirs and fault structures,
is combined with deep undercurrents and a complex seafloor morphology. In the Gulf of Cadiz, the
model depicts the distribution of the base of the gas hydrate stability zone for both biogenic and thermogenic
gas compositions, and explains the geometry and distribution of geological structures derived
from gas venting in the Tasyo Field (Gulf of Cadiz) and the generation of BSR levels on the upper
continental slope.


Item Type:Article
Uncontrolled Keywords:Gas hydrates, GIS, Heat flow, Fluid flow, Mud volcanoes, Gulf of Cadiz
Subjects:Sciences > Geology > Stratigraphic geology
Sciences > Geology > Geodynamics
ID Code:11186
Deposited On:20 Sep 2010 10:15
Last Modified:20 Sep 2010 10:15

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