Building Stratigraphic surfaces tied to well markers using a morphing-like approach - Application to Stratigraphich grid building

in: Proc. 15^{th}$ Gocad Meeting, Nancy

Abstract

The construction of stratigraphie surfaces is a crucial step in 3D geological modelling. In most reservoir studies, only a few seismic events can be picked on the 3D sei smic block, and other geological surfaces not seen an seismic can be picked at the wells and must be interpalated between tlJese wells. Stratigraphie surfaces are built to get a liner reservoir layering that will be used to guide the interpolation of facies and petrophysical properties between wells. Such surfaces are poorly constrained by "hard data", since they are only picked at the wells. In addition, geological information about stratigraphy (pin chouts, erosion) and structure (faults) can be used ta control the 3D modelling operation. Not only vertical faults, but also dipping ones must be handled. In this note, we present a new metllOd for building stl'atigraphic surfaces from seismic top and base surfaces of a faulted l'eservoir, taking into account well markers and geological information. The algorithm is based on a morphing-like approach which allows the construction of more surfaces within a reservoir unit, between the base and top of this unit. We also show llOW these surfaces can then be used ta control the construction of a 3D faulted stratigraphie grid within tlle resel'voir unit.

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    BibTeX Reference

    @INPROCEEDINGS{Bombarde97,
        author = { Bombarde, Sebastien },
         title = { Building Stratigraphic surfaces tied to well markers using a morphing-like approach - Application to Stratigraphich grid building },
     booktitle = { Proc. 15^{th}$ Gocad Meeting, Nancy },
          year = { 1997 },
      abstract = { The construction of stratigraphie surfaces is a crucial step in 3D
    geological modelling. In most reservoir studies, only a few seismic
    events can be picked on the 3D sei smic block, and other geological
    surfaces not seen an seismic can be picked at the wells and must be
    interpalated between tlJese wells. Stratigraphie surfaces are built to get
    a liner reservoir layering that will be used to guide the interpolation
    of facies and petrophysical properties between wells. Such surfaces are
    poorly constrained by "hard data", since they are only picked at the
    wells. In addition, geological information about stratigraphy (pin chouts,
    erosion) and structure (faults) can be used ta control the 3D
    modelling operation. Not only vertical faults, but also dipping ones
    must be handled. In this note, we present a new metllOd for building
    stl'atigraphic surfaces from seismic top and base surfaces of a faulted
    l'eservoir, taking into account well markers and geological information.
    The algorithm is based on a morphing-like approach which allows the
    construction of more surfaces within a reservoir unit, between the base
    and top of this unit. We also show llOW these surfaces can then be used
    ta control the construction of a 3D faulted stratigraphie grid within
    tlle resel'voir unit. }
    }