Sulfate-methane transition as a proxy for average methane hydrate saturation in marine sediments

被引：45

作者：

Bhatnagar, Gaurav ^{[1
]}

Chapman, Walter G. ^{[1
]}

Dickens, Gerald R. ^{[2
]}

Dugan, Brandon ^{[2
]}

Hirasaki, George J. ^{[1
]}

机构：

[1] Univ Houston, Dept Chem & Biomol Engn, Houston, TX 77030 USA

[2] Rice Univ, Dept Earth Sci, Houston, TX 77251 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2008年 / 35卷 / 03期

关键词：

D O I：

10.1029/2007GL032500

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We develop a relationship between the sulfate-methane transition (SMT) and average gas hydrate saturation (AGHS) for systems dominated by methane migration from deeper sources. The relationship is explained by a one-dimensional numerical model that simulates gas hydrate accumulation in marine sediments. Higher methane fluxes result in shallow SMT depths and high AGHS, while lower methane fluxes result in deep SMTs and low AGHS. We also generalize the variation between AGHS and scaled SMT depth, a procedure that aids prediction of AGHS at different sites from observations of the SMT, such as along Cascadia Margin.

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