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https://hdl.handle.net/2440/13697
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Type: | Journal article |
Title: | Does the in situ stress field control the orientation of open fractures in sub-surface reservoirs? |
Author: | Hillis, R. |
Citation: | Exploration Geophysics, 1997; 28(2):80-87 |
Publisher: | Aseg Publications |
Issue Date: | 1997 |
ISSN: | 0812-3985 1834-7533 |
Abstract: | In order to evaluate naturally fractured reservoirs, it is critical to assess whether natural fracture sets believed to exist at depth (eg, from surface mapping and/or seismic data) are likely to be open and productive or closed and non-productive. The semi-log relation between stress and the closure of natural fractures is combined with the effective normal stress acting on fractures to yield: [see full text for equation] which relates fracture closure (d), the constants in the semi-log fracture closure/stress relation (k and s), and maximum effective horizontal stress (sH¢) magnitude with the effective horizontal stress ratio (n), and the angle between the normal to the fracture and the sH direction (q). This relation shows that: (i) for a given fracture, the sensitivity of fracture closure to the anisotropy of the in situ stress field can be constrained by the effective horizontal stress ratio (n); (ii) natural fracture closure is sensitive to fracture orientation with respect to the in situ stress field where n is high; (iii) the sensitivity of natural fracture closure to its orientation with respect to the in situ stress field decreases markedly as n drops; and (iv) the rate of change of closure with changing orientation is relatively low at very low and very high misalignment angles, and much greater at intermediate angles. © 1997, CSIRO. All rights reserved. |
DOI: | 10.1071/EG997080 |
Published version: | http://www.publish.csiro.au/?act=view_file&file_id=EG997080.pdf |
Appears in Collections: | Aurora harvest 2 Geology & Geophysics publications |
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