A new stochastic methodology to simulate non-planar fractures.

in: Proc. 28th Gocad Meeting, Nancy

Abstract

Faults and fractures are known to signi cantly alter the circulation of uid in reservoirs, either acting as seals or conduits. Characterization and modeling of the spatial distribution of fractures, as well as their properties (e.g. geometry, connectivity, aperture, etc.) can therefore have a great impact on recovery prediction of natural water and hydrocarbon accumulations. This paper intro- duces a new methodology to simulate discrete fracture networks (DFN). The Geometry of faults and joints patterns are related to physical processes of fracture initiation, propagation, interaction and termination which can be described by Linear Elastic Fracture Mechanics (LEFM). The motivation of the proposed method is to mimic these processes to generate more realistic fracture patterns. The mechanicals principles are however replaced by geostatistical rules. DFN simulation constrained by local fracture intensity is used to seed fracture planes with an initial direction of propagation and intended nal dimensions. Fracture intensities and orientations are derived from the geomechanical model, while the nal dimensions are drawn from a model of fracture length and height distribu- tions. Growth of initial fracture segments is then simulated using variogram-based geostatistics. At each step, fracture tips are visited in random order and propagated in a direction determined by sequential Gaussian co-simulation, using orientations of closest fractures and those predicted by the geomechanical model as auxiliary data. Eventually, fracture termination occurs when fractures reach their intended nal dimensions or collide either with other fractures or bedding planes.

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    BibTeX Reference

    @INPROCEEDINGS{henrionGM08,
        author = { Henrion, Vincent and Caumon, Guillaume and Viard, Thomas },
         title = { A new stochastic methodology to simulate non-planar fractures. },
     booktitle = { Proc. 28th Gocad Meeting, Nancy },
          year = { 2008 },
      abstract = { Faults and fractures are known to signicantly alter the circulation of 
    uid in reservoirs, either
    acting as seals or conduits. Characterization and modeling of the spatial distribution of fractures,
    as well as their properties (e.g. geometry, connectivity, aperture, etc.) can therefore have a great
    impact on recovery prediction of natural water and hydrocarbon accumulations. This paper intro-
    duces a new methodology to simulate discrete fracture networks (DFN). The Geometry of faults and
    joints patterns are related to physical processes of fracture initiation, propagation, interaction and
    termination which can be described by Linear Elastic Fracture Mechanics (LEFM). The motivation
    of the proposed method is to mimic these processes to generate more realistic fracture patterns. The
    mechanicals principles are however replaced by geostatistical rules. DFN simulation constrained by
    local fracture intensity is used to seed fracture planes with an initial direction of propagation and
    intended nal dimensions. Fracture intensities and orientations are derived from the geomechanical
    model, while the nal dimensions are drawn from a model of fracture length and height distribu-
    tions. Growth of initial fracture segments is then simulated using variogram-based geostatistics.
    At each step, fracture tips are visited in random order and propagated in a direction determined
    by sequential Gaussian co-simulation, using orientations of closest fractures and those predicted by
    the geomechanical model as auxiliary data. Eventually, fracture termination occurs when fractures
    reach their intended nal dimensions or collide either with other fractures or bedding planes. }
    }