Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Insights into pore-scale controls on mudstone permeability through resedimentation experiments

Julia Schneider, Peter B. Flemings, Ruarri J. Day-Stirrat and John T. Germaine
Insights into pore-scale controls on mudstone permeability through resedimentation experiments
Geology (Boulder) (November 2011) 39 (11): 1011-1014

Abstract

At a given porosity, mudstone permeability increases by an order of magnitude for clay contents ranging from 57% to 36% (<2 mu m). This increase in vertical permeability results from a dual-porosity system that develops through three mechanisms: (1) silt bridging preserves large pore throats, (2) stress bridges inhibit clay particle alignment, and (3) local clay particle compression within stress bridges alters pore throat size distribution. Uniaxial consolidation experiments on resedimented clay-silt mixtures illuminate how permeability varies as a function of clay fraction during burial. Backscattered electron microscope images show that silty mixtures have larger pore throats and fewer aligned clay particles than do more clay-rich mixtures. We describe the permeability of clay-silt mixtures with a geometric mean model. Our method provides a promising framework for modeling of mudstone permeability as a function of clay fraction and porosity. How permeability and consolidation evolve during burial affects the ability of mudstones to seal CO (sub 2) and hydrocarbons in the subsurface, how mudstones behave as gas reservoirs, and under what conditions mudstones will be overpressured. Dual-porosity systems have fundamentally different transient flow and solute transport behaviors.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 39
Serial Issue: 11
Title: Insights into pore-scale controls on mudstone permeability through resedimentation experiments
Affiliation: University of Texas at Austin, Jackson School of Geosciences, Austin, TX, United States
Pages: 1011-1014
Published: 201111
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 24
Accession Number: 2012-007666
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2011298
Illustration Description: illus. incl. 1 table
Secondary Affiliation: Massachusetts Institute of Technology, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201204
Close Modal

or Create an Account

Close Modal
Close Modal