Extraction automatique d'information géologique à partir d'images sismiques tridimensionelles

Institut National Polytechnique de Lorraine

Abstract

Three dimensional seismic data are the main source of information in the geomodelisation of oil reservoirs. In this thesis, we propose severa! algorithms to automate their interpretation, which is a long and diffi.cult task. This work led to a first interpretation station in the gücad geomodeling software. A continuous approach of the seismic signal allows us, in a first time, to compute a~curately the main geometrical seismic attributes, to analytically formulate the instantaneous attributes and to realize a filter to smooth the horizons on the seismic picture. In a second time, two main applications of these attributes are studied. The first one consists in combining the attributes in seismic facies, more easily interpretable by geologists. A segmentation method, using P.C.A. and moving centers, has been reimplemented, while a new method based on interpolation maps has been specially developed for meta-attributes computation. The second application is the picking of surfaces used in the building of the reservoir structural model. Two new techniques of autopicking of seismic horizons are proposed, the first using a continuous approach of the signal, the second one based on a multi-attributes pattern tracking. Editing tools are joined, to give the interpreter a control of his work. Fault autotracking is also approached, essentially on a bibliographical angle, with the implementation of two methods of the literature.

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BibTeX Reference

@PHDTHESIS{Labrunye2004a,
    author = { Labrunye, Emmanuel },
     title = { Extraction automatique d'information géologique à partir d'images sismiques tridimensionelles },
      year = { 2004 },
    school = { Institut National Polytechnique de Lorraine },
  abstract = { Three dimensional seismic data are the main source of information in the geomodelisation
of oil reservoirs. In this thesis, we propose severa! algorithms to automate their interpretation,
which is a long and diffi.cult task. This work led to a first interpretation station in the gücad
geomodeling software.
A continuous approach of the seismic signal allows us, in a first time, to compute a~curately
the main geometrical seismic attributes, to analytically formulate the instantaneous attributes
and to realize a filter to smooth the horizons on the seismic picture.
In a second time, two main applications of these attributes are studied. The first one consists
in combining the attributes in seismic facies, more easily interpretable by geologists. A segmentation
method, using P.C.A. and moving centers, has been reimplemented, while a new method
based on interpolation maps has been specially developed for meta-attributes computation.
The second application is the picking of surfaces used in the building of the reservoir structural
model. Two new techniques of autopicking of seismic horizons are proposed, the first using
a continuous approach of the signal, the second one based on a multi-attributes pattern tracking.
Editing tools are joined, to give the interpreter a control of his work. Fault autotracking is also
approached, essentially on a bibliographical angle, with the implementation of two methods of
the literature. }
}