Determining Upper Bounds for the Clay-squirt Effect in Clay Bearing Sandstone

Publication: Research - peer-reviewConference abstract for conference – Annual report year: 2012

Standard

Determining Upper Bounds for the Clay-squirt Effect in Clay Bearing Sandstone. / Sørensen, Morten Kanne; Fabricius, Ida Lykke.

2012. Abstract from 74th EAGE Annual Conference and Exhibition incorporating SPE Europec 2012, Copenhagen, Denmark.

Publication: Research - peer-reviewConference abstract for conference – Annual report year: 2012

Harvard

Sørensen, MK & Fabricius, IL 2012, 'Determining Upper Bounds for the Clay-squirt Effect in Clay Bearing Sandstone' 74th EAGE Annual Conference and Exhibition incorporating SPE Europec 2012, Copenhagen, Denmark, 04/07/12 - 07/07/12,

APA

Sørensen, M. K., & Fabricius, I. L. (2012). Determining Upper Bounds for the Clay-squirt Effect in Clay Bearing Sandstone. Abstract from 74th EAGE Annual Conference and Exhibition incorporating SPE Europec 2012, Copenhagen, Denmark.

CBE

Sørensen MK, Fabricius IL. 2012. Determining Upper Bounds for the Clay-squirt Effect in Clay Bearing Sandstone. Abstract from 74th EAGE Annual Conference and Exhibition incorporating SPE Europec 2012, Copenhagen, Denmark.

MLA

Vancouver

Sørensen MK, Fabricius IL. Determining Upper Bounds for the Clay-squirt Effect in Clay Bearing Sandstone. 2012. Abstract from 74th EAGE Annual Conference and Exhibition incorporating SPE Europec 2012, Copenhagen, Denmark.

Author

Sørensen, Morten Kanne; Fabricius, Ida Lykke / Determining Upper Bounds for the Clay-squirt Effect in Clay Bearing Sandstone.

2012. Abstract from 74th EAGE Annual Conference and Exhibition incorporating SPE Europec 2012, Copenhagen, Denmark.

Publication: Research - peer-reviewConference abstract for conference – Annual report year: 2012

Bibtex

@misc{fe5549edf330434c969ec7145945e31d,
title = "Determining Upper Bounds for the Clay-squirt Effect in Clay Bearing Sandstone",
author = "Sørensen, {Morten Kanne} and Fabricius, {Ida Lykke}",
note = "1005",
year = "2012",
type = "ConferencePaper <importModel: ConferenceImportModel>",

}

RIS

TY - ABST

T1 - Determining Upper Bounds for the Clay-squirt Effect in Clay Bearing Sandstone

A1 - Sørensen,Morten Kanne

A1 - Fabricius,Ida Lykke

AU - Sørensen,Morten Kanne

AU - Fabricius,Ida Lykke

PY - 2012

Y1 - 2012

N2 - Sonic measurements of saturated bulk moduli of clay bearing sandstones show larger values than expected by Gassmann modelling from dry rock properties. This causes difficulties in extrapolation of laboratory data to different saturants or frequencies. Squirt flow from the clay phase of the rock have been proposed as the mechanism behind this stiffening. Low fluid mobility and low bulk modulus of the clay phase cause excess pore-pressures to be induced and retained in the phase leading to stiffening. A quantitative bound is formulated for this effect through the determination of the Hashin-Shtrikman bounds for the case of a drained clay phase and an undrained clay phase. The bound is achieved by analyzing the influence of the relevant parameters with subsequent grouping using reasonable correlations. Through this approach only the saturated bulk modulus of the quartz phase and the clay fraction remain as free parameters. The bound is calculated for all possible values of these parameters. Experimentally observed values for non-Gassmann bulk modulus stiffening are found to fall below the bound for all values within the Hashin-Shtrikman bounds. Hereby this study shows that the clay-squirt effect may be the cause of observed stiffening.

AB - Sonic measurements of saturated bulk moduli of clay bearing sandstones show larger values than expected by Gassmann modelling from dry rock properties. This causes difficulties in extrapolation of laboratory data to different saturants or frequencies. Squirt flow from the clay phase of the rock have been proposed as the mechanism behind this stiffening. Low fluid mobility and low bulk modulus of the clay phase cause excess pore-pressures to be induced and retained in the phase leading to stiffening. A quantitative bound is formulated for this effect through the determination of the Hashin-Shtrikman bounds for the case of a drained clay phase and an undrained clay phase. The bound is achieved by analyzing the influence of the relevant parameters with subsequent grouping using reasonable correlations. Through this approach only the saturated bulk modulus of the quartz phase and the clay fraction remain as free parameters. The bound is calculated for all possible values of these parameters. Experimentally observed values for non-Gassmann bulk modulus stiffening are found to fall below the bound for all values within the Hashin-Shtrikman bounds. Hereby this study shows that the clay-squirt effect may be the cause of observed stiffening.

ER -