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| Titel |
Microstructure induced nonlinearity of unconsolidated rocks as related to seismic diagnostic problems |
| VerfasserIn |
I. Yu. Belyaeva, L. A. Ostrovsky, V. Yu. Zaitsev |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 4, no. 1 ; Nr. 4, no. 1, S.1-10 |
| Datensatznummer |
250001456
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| Publikation (Nr.) |
 copernicus.org/npg-4-1-1997.pdf |
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| Zusammenfassung |
| Manifestations of the so-called
structure induced
nonlinearity are considered for the case of a granular
medium,
the latter being a generally accepted model of
nonconsolidated
rocks in seismics. The consideration is carried out
using the
medium model in the form of the "ideal" random
packing of
spherical elastic granules in which the interparticle
space
can be filled with a fluid. A physical equation of
such a
medium is derived; the dependencies of nonlinear
parameters on
the grain material elastic moduli, the fluid
compressibility
and the initial medium strain are analyzed. The
influence of
defects in nonideal grain packings (that is, the
presence of a
fraction of unloaded intergranular contacts)
upon the
nonlinear properties of the medium is investigated.
It is
shown that the packing nonideality has the stronger
effect on
higher-order nonlinear properties. It is demonstrated
that the
nonlinear parameters may be used in exploration
seismology as
a much more sensitive and informative characteristic
compared
with conventionally used linear moduli. |
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