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The Stress Sensitivity Approach: Theory and Application
Kaselow, Axel

HaupttitelThe Stress Sensitivity Approach: Theory and Application
TitelvarianteDer Spannungs-Sensitivitäts-Ansatz: Theorie und Anwendung
AutorKaselow, Axel
Geburtsort: Düsseldorf, Deutschland
GutachterProf. Dr. Serge A. Shapiro
weitere GutachterProf. Dr. Volker Haak
Freie SchlagwörterStress, Pressure, Porosity, Compliances, Velocities
DDC550 Geowissenschaften
Zusammenfassung

This thesis presents the theory and the first applications of the stress sensitivity approach for anisotropic media under arbitrary effective stress. This approach enables a rock physical interpretation of seismic velocity observations as a function of confining stress and pore pressure.

The main objective of this thesis was to validate the key aspects of the theoretical results by analyzing stress dependent seismic velocity observations obtained from very different rocks in ultrasonic laboratory experiments. The stress sensitivity approach formulates the stress dependence of velocities in terms of the variations of the dry rock matrix compliances via stress induced variations of the pore space geometry. The most important characteristic for the stress dependence of various rock properties is the tensor of stress sensitivity.

It is shown that there are many different isotropic and anisotropic rocks where all elastic compliances and seismic velocities in each direction under isostatic load can be described by an equation of the form:

Γ(P) = AΓ + KΓ P - BΓexp(-DP),

where Γ is the property under consideration. The stress sensitivity approach provides the physical meaning of the fit parameters A, K, B, and D with respect to this rock property. Moreover, it was found that the parameter D is a universal quantity for all mentioned properties.

The stress sensitivity approach was applied to P- and S-wave velocity-stress observations from different rock types. For each of the samples it was possible to find a universal parameter D. It was also found that for some rocks the universality of parameter D even holds for the stress dependence of electrical resistivity.

Results derived from the analyzis of stress dependent velocity observations on dry rocks of the KTB pilot hole were used to estimate reflectivity pattern changes of the SE2 fault zone induced by pumping and injection tests.

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Fachbereich/EinrichtungFB Geowissenschaften
Erscheinungsjahr2004
Dokumententyp/-SammlungenDissertation
Medientyp/FormatText
SpracheEnglisch
RechteNutzungsbedingungen
Tag der Disputation26.05.2004
Erstellt am16.06.2004 - 00:00:00
Letzte Änderung19.02.2010 - 13:37:37
 
Alte Darwin URLhttp://www.diss.fu-berlin.de/2004/151/
Statische URLhttp://www.diss.fu-berlin.de/diss/receive/FUDISS_thesis_000000001276
URNurn:nbn:de:kobv:188-2004001510
Zugriffsstatistik