Skip to Main Content
Book Chapter

Stress-dependence of porosity and permeability of the Upper Jurassic Bossier shale: an experimental study

By
R. Fink
R. Fink
Institute of Geology and Geochemistry of Petroleum and Coal, Energy and Mineral Resources Group (EMR), RWTH Aachen University, Lochnerstrasse 4-20, D-52056 Aachen, Germany
Search for other works by this author on:
B. M. Krooss
B. M. Krooss
Institute of Geology and Geochemistry of Petroleum and Coal, Energy and Mineral Resources Group (EMR), RWTH Aachen University, Lochnerstrasse 4-20, D-52056 Aachen, Germany
Search for other works by this author on:
A. Amann-Hildenbrand
A. Amann-Hildenbrand
Institute of Geology and Geochemistry of Petroleum and Coal, Energy and Mineral Resources Group (EMR), RWTH Aachen University, Lochnerstrasse 4-20, D-52056 Aachen, Germany
Search for other works by this author on:
Published:
January 01, 2017

Abstract

In order to characterize the stress-dependence of porosity and permeability of Bossier shale, a series of measurements was conducted on three dry, horizontally orientated samples using various gases under controlled stress conditions.

The Klinkenberg-corrected permeability and gas slippage factors varied by more than two orders of magnitude (0.21–86 µD) and by one order of magnitude (0.09–0.89 MPa), respectively. Porosity values measured under in situ stress conditions were lower by up to 30% than those measured at ambient conditions. Therefore, disregarding the stress-dependence of porosity may lead to a substantial overestimation of the free gas storage capacity.

The stress sensitivity of Klinkenberg-corrected permeability coefficients (−0.012–−0.063MPa−1) is much larger than the stress sensitivity of porosity (−0.0014–−0.0033 MPa−1). Particularly for pore systems dominated by microfractures or slit-shaped pores, the permeability is highly sensitive to effective stress changes. While conventional pore models use porosity stress-sensitivity exponents (m) ranging between 3 and 5, we measured values of up to 27. Strongly stress-sensitive permeability behaviour is a result of effective stress preferentially reducing the volume and effective cross-section of transport pathways. In contrast, stress-dependent permeability of a less stress-sensitive sample is instead controlled by the redistribution of flow.

You do not currently have access to this article.

Figures & Tables

Contents

Geological Society, London, Special Publications

Geomechanical and Petrophysical Properties of Mudrocks

E. H. Rutter
E. H. Rutter
University of Manchester, UK
Search for other works by this author on:
J. Mecklenburgh
J. Mecklenburgh
University of Manchester, UK
Search for other works by this author on:
K. Taylor
K. Taylor
University of Manchester, UK
Search for other works by this author on:
Geological Society of London
Volume
454
ISBN electronic:
978-1-78620-335-9
Publication date:
January 01, 2017

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal