Dictionary:Anisotropy (electrical)

ADVERTISEMENT
From SEG Wiki
Revision as of 17:59, 17 November 2018 by Brendisa (talk | contribs) (Marked this version for translation)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search
Other languages:
English • ‎español


Variation of an electrical property depending on the direction in which it is measured. The resistivity anisotropy coefficient is the square root of the ratio of the resistivity measured perpendicular to the bedding to that parallel to the bedding; also called pseudo-anisotropy. It usually has a value between 1 and 2. For a sequence of isotropic layers with thicknesses zi and resistivities the unit resistance RT is


;


and the pseudo-anisotropy is


.


See dar Zarrouk. The anisotropy of induced polarization in rocks is less than the anisotropy of resistivity. In layered rocks the resistivity parallel to the layering is less than that perpendicular to the layering. Anisotropy as measured in a borehole is caused by cyclic thin sequences of alternating sand and shale, sorting of sand grains, and fractures (healed or fluid-filled).


External links

find literature about
Anisotropy (electrical)
SEG button search.png Datapages button.png GeoScienceWorld button.png OnePetro button.png Schlumberger button.png Google button.png AGI button.png