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Methods of gas hydrate concentration estimation with field examples

DRS at CSIR-National Institute of Oceanography

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Title Methods of gas hydrate concentration estimation with field examples
 
Creator Kumar, D.
Dash, R.
Dewangan, P.
 
Subject gas hydrate
oil and gas exploration
geophysical exploration
 
Description The presence of gas hydrates alters the bulk physical properties of the host sediments. The deviation of the physical property in the hydrated layer from the regional (hydrate-free background) trend can be used to estimate hydrate concentration. Six different methods of gas hydrate concentration estimation that make use of data from the measurements of the seismic properties, electrical resistivity, chlorinity, porosity, density, and temperature are summarized in this paper. We demonstrate the methods of hydrate concentration estimation using data from three different geographical areas: 1) Mount Elbert test site, Alaska, 2) Cascadia margin, offshore Canada and 3) Krishna Godavari (KG) basin, offshore India. Based on our estimation, the hydrate saturation in the hydrate stability zone varies from 40% to 80% of pore space in Alaska, 10% to 40% of pore space in the Cascadia margin, and 5% to 40% of pore space in the KG basin. There are various factors that can affect the hydrate saturation estimate; the two most important factors being the background property value in the absence of gas hydrate, and the modeling relationship between the physical property and gas hydrate saturation. a simple work-flow for hydrate saturation estimation from seismic velocity in a Microsoft Excel sheet is also presented.
 
Date 2010-05-11T10:05:09Z
2010-05-11T10:05:09Z
2009
 
Type Journal Article
 
Identifier Geohorizons, vol.December; 76-86
http://drs.nio.org/drs/handle/2264/3609
 
Language en
 
Rights All efforts have been made to respect the copyright to the best of our
knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Society of Petroleum Geophysicists, India