Abstract
This work is devoted to the theory of joint interpretation of multimethod geophysical data and its
application to the solution of real geophysical inverse problems. The targets of such joint interpretation
can be geological bodies with an established dependence between various physical properties that cause
anomalies in several geophysical fields (geophysical multiresponse). The establishing of the relationship
connecting the various physical properties is therefore a necessary first step in any joint interpretation
procedure. Bodies for which the established relationship between physical properties is violated
(single-response bodies) can be targets of separate interpretations. The probabilistic (Bayesian) approach
provides the necessary formalism for addressing the problem of the joint inversion of multimethod
geophysical data, which can be non-linear and have a non-unique solution. Analysis of the lower limit of
resolution of the non-linear problem of joint inversion using the definition of e-entropy demonstrates that
joint inversion of multimethod geophysical data can reduce non-uniqueness in real geophysical inverse
problems. The question can be formulated as a multiobjective optimisation problem (MOP), enabling the
numerical methods of this theory to be employed for the purpose of geophysical data inversion and for
developing computer algorithms capable of solving highly non-linear problems. An example of such a problem
is magnetotelluric impedance tensor inversion with the aim of obtaining a 3-D resistivity distribution. An
additional area of application for multiobjective optimisation can be the combination of various types of
uncertain information (probabilistic and non-probabilistic) in a common inversion scheme applicable to
geophysical inverse problems. It is demonstrated how the relationship between seismic velocity and density
can be used to construct an algorithm for the joint interpretation of gravity and seismic wide-angle
reflection and refraction data. The relationship between the elastic and electrical properties of rocks,
which is a necessary condition for the joint inversion of data obtained by seismic and electromagnetic
methods, can be established for solid- liquid rock mixtures using theoretical modelling of the elastic and
electrical properties of rocks with a fractal microstructure and from analyses of petrophysical data and
borehole log data.
| Identifer | oai:union.ndltd.org:oulo.fi/oai:oulu.fi:isbn951-42-5960-2 |
| Date | 12 April 2001 |
| Creators | Kozlovskaya, E. (Elena) |
| Publisher | University of Oulu |
| Source Sets | University of Oulu |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/doctoralThesis, info:eu-repo/semantics/publishedVersion |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess, © University of Oulu, 2001 |
| Relation | info:eu-repo/semantics/altIdentifier/pissn/0355-3191, info:eu-repo/semantics/altIdentifier/eissn/1796-220X |
Page generated in 0.0043 seconds