Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4694257 | Tectonophysics | 2009 | 15 Pages |
Abstract
In situ stresses at the drill site were inferred from leak-off tests, borehole breakouts and drilling-induced tensile fractures from borehole FMS/FMI logs, and shear seismic wave anisotropy from DSI logs. The dominant fast shear-wave polarization direction is in good agreement with regional maximum horizontal stress axis, particularly within the strongly anisotropic Kueichulin Formation. A conjugate set of secondary directions are parallel to microcrack orientations. A drastic change of orientation of fast shear-wave polarization across the Sanyi thrust fault at the depth of 1712Â m reflects the change of stratigraphy, physical properties and structural geometry.
Keywords
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Earth-Surface Processes
Authors
Jih-Hao Hung, Kuo-Fong Ma, Chien-Yin Wang, Hisao Ito, Weiren Lin, En-Chao Yeh,