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In-situ holographic elastic moduli measurements from boreholes

Schmitt, Douglas R. and Smither, Catherine and Ahrens, Thomas J. (1989) In-situ holographic elastic moduli measurements from boreholes. Geophysics, 54 (4). pp. 468-477. ISSN 0016-8033. http://resolver.caltech.edu/CaltechAUTHORS:20141031-073217994

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Abstract

We have developed a unique technique employing optical holography to measure the static Young's modulus (E) from a borehole. In the experiment, a known point force induces micron scale displacements on the borehole wall which are recorded by a double-exposure hologram. Raw data consist of dark fringes superimposed on the three-dimensional image whose pattern is modeled to find E directly. In the laboratory, the holographic technique determined E on rock and metal samples to an uncertainty better than 10 percent. For example, double exposure holograms of a saw-cut sample of dolomitic marlstone gave an E of 16.8 ± 2.8 GPa in agreement with 17.2 ± 2.0 GPa predicted by published density-modulus relationships. Field tests of a holographic tool in a horizontal mine pillar borehole gave in-situ Es which range from 26.9 to 36.0 GPa. Although these data could be interpreted as localized elastic heterogeneity within the rock mass, elastic anisotropy of the rock is a possible explanation for this variation.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1190/1.1442673DOIArticle
http://library.seg.org/doi/abs/10.1190/1.1442673PublisherArticle
http://geophysics.geoscienceworld.org/content/54/4/468PublisherArticle
Additional Information:© 1989 Society of Exploration Geophysicists. Presented at the 56th Annual International Meeting, Society of Exploration Geophysicists. Manuscript received by the Editor October 2, 1987; revised manuscript received September 12, 1988. The authors wish to thank Tom Nolan, Bridget Jensen, Epaprodito Gelle, Michael Long, William Barber, Wayne Miller, Gunther Haehn, and Dick Wickes for assistance in the field and laboratory. Douglas Schmitt greatly appreciates support from the Alberta Heritage Scholarship Fund from 1984 to 1986. This research was funded by grants from Schlumberger Technical Corporation, Sun Oil Corporation, and the Department of Energy (DE-FG03-85ER13422). Contribution 4523, Division of Geological and Planetary Sciences, California Institute of Technology.
Funders:
Funding AgencyGrant Number
Schlurnberger Technical CorporationUNSPECIFIED
Sun Oil Co.UNSPECIFIED
Department of Energy (DOE)DE-FG03-85ER13422
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Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences4523
Record Number:CaltechAUTHORS:20141031-073217994
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141031-073217994
Official Citation:Douglas R. Schmitt, Catherine Smither, and Thomas J. Ahrens In-situ holographic elastic moduli measurements from boreholes Geophysics, April 1989, v. 54, p. 468-477, published online April 1, 1989, doi:10.1190/1.1442673
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51097
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:31 Oct 2014 16:19
Last Modified:31 Oct 2014 16:19

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