skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Linking preferred orientations to elastic anisotropy in Muderong Shale, Australia

Abstract

The significance of shales as unconventional hydrocarbon reservoirs, nuclear waste repositories, and geological carbon storage has opened new research frontiers in geophysics. Among many of its unique physical properties, elastic anisotropy has long been investigated by both experimental and computational approaches. Here we calculate elastic properties of Cretaceous Muderong Shale from Australia with a self-consistent averaging method based on microstructural information. The volume fraction and crystallographic preferred orientation distributions of constituent minerals are based on synchrotron X-ray diffraction experiments. Aspect ratios of minerals and pores, determined from scanning electron microscopy (SEM), are introduced in the self-consistent averaging. Our analysis suggests that phyllosilicates (i.e., illite-mica, illite-smectite, kaolinite, and chlorite) are dominant with ~70 vol.%. The shape of clay platelets displays an average aspect ratio of 0.05. These platelets are aligned parallel to the bedding plane with a rather high degree of preferred orientation. The estimated porosity at ambient pressure is ~17 vol.% and is divided into equiaxial pores and flat pores with an average aspect ratio of 0.01. Our model shows results (e.g. at pressure of ~50 MPa with C 11 = 26.3; C 13 =12.5; C 33 = 18.2; C 44 = 2.8; C 66 = 6.8 [GPa]) that comparemore » satisfactorily with values derived from ultrasonic velocity measurements (C 11 = 26.6; C 13 = 16.2; C 33 = 18.3; C 44 = 4.5; C 66 = 8.8 [GPa]), confirming the validity and reliability of our approximations and averaging approach.« less

Authors:
 [1];  [2];  [3];  [4]
  1. Univ. of California, Berkeley, CA (United States); Chulalongkorn Univ., Bangkok (Thailand)
  2. Univ. of California, Berkeley, CA (United States); Joint Institute for Nuclear Research, Dubna (Russia)
  3. Univ. of California, Berkeley, CA (United States)
  4. CSIRO Earth Science and Resource Engineering, Perth (Australia)
Publication Date:
Research Org.:
Carnegie Institution of Washington, Washington, D.C. (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1335148
Grant/Contract Number:  
NA0002006
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Geophysics
Additional Journal Information:
Journal Volume: 80; Journal Issue: 1; Journal ID: ISSN 0016-8033
Publisher:
Society of Exploration Geophysicists
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; shale; anisotropy; clay minerals; preferred orientation; self-consistent elastic averaging

Citation Formats

Kanitpanyacharoen, Waruntorn, Vasin, Roman, Wenk, Hans -Rudolf, and Dewhurst, David. N. Linking preferred orientations to elastic anisotropy in Muderong Shale, Australia. United States: N. p., 2015. Web. doi:10.1190/geo2014-0236.1.
Kanitpanyacharoen, Waruntorn, Vasin, Roman, Wenk, Hans -Rudolf, & Dewhurst, David. N. Linking preferred orientations to elastic anisotropy in Muderong Shale, Australia. United States. doi:10.1190/geo2014-0236.1.
Kanitpanyacharoen, Waruntorn, Vasin, Roman, Wenk, Hans -Rudolf, and Dewhurst, David. N. Thu . "Linking preferred orientations to elastic anisotropy in Muderong Shale, Australia". United States. doi:10.1190/geo2014-0236.1. https://www.osti.gov/servlets/purl/1335148.
@article{osti_1335148,
title = {Linking preferred orientations to elastic anisotropy in Muderong Shale, Australia},
author = {Kanitpanyacharoen, Waruntorn and Vasin, Roman and Wenk, Hans -Rudolf and Dewhurst, David. N.},
abstractNote = {The significance of shales as unconventional hydrocarbon reservoirs, nuclear waste repositories, and geological carbon storage has opened new research frontiers in geophysics. Among many of its unique physical properties, elastic anisotropy has long been investigated by both experimental and computational approaches. Here we calculate elastic properties of Cretaceous Muderong Shale from Australia with a self-consistent averaging method based on microstructural information. The volume fraction and crystallographic preferred orientation distributions of constituent minerals are based on synchrotron X-ray diffraction experiments. Aspect ratios of minerals and pores, determined from scanning electron microscopy (SEM), are introduced in the self-consistent averaging. Our analysis suggests that phyllosilicates (i.e., illite-mica, illite-smectite, kaolinite, and chlorite) are dominant with ~70 vol.%. The shape of clay platelets displays an average aspect ratio of 0.05. These platelets are aligned parallel to the bedding plane with a rather high degree of preferred orientation. The estimated porosity at ambient pressure is ~17 vol.% and is divided into equiaxial pores and flat pores with an average aspect ratio of 0.01. Our model shows results (e.g. at pressure of ~50 MPa with C11 = 26.3; C13 =12.5; C33 = 18.2; C44 = 2.8; C66 = 6.8 [GPa]) that compare satisfactorily with values derived from ultrasonic velocity measurements (C11 = 26.6; C13 = 16.2; C33 = 18.3; C44 = 4.5; C66 = 8.8 [GPa]), confirming the validity and reliability of our approximations and averaging approach.},
doi = {10.1190/geo2014-0236.1},
journal = {Geophysics},
issn = {0016-8033},
number = 1,
volume = 80,
place = {United States},
year = {2015},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

Save / Share: