Caractérisation et modélisation numérique tridimensionnelle des réseaux de fractures naturelles

Laetitia Mace. ( 2006 )
INPL, Nancy, France

Abstract

Natural fractures have a dramatic impact on reservoirs either in fields such as mining and petroleum engineering or hydrogeology. Acting as conductors or barriers, they often control flow and also storage capacity in such reservoirs. The presented work is part of the naturally fractured reservoirs numerical modelling pipeline, addressing the specific issues of characterizing and modelling fractures in three dimensions. The proposed approaches successively deal with the first logical stages of this modelling : 1. Characterization of natural fractures from structural data : a geomechanical and probabilistic approach in three dimensions integrates tensorial strain data (obtained from forward or backward modelling techniques) in order to compute new structural drivers of fracturing intensity and orientation. The proposed mathematical framework also accounts for petrophysical rock property uncertainties. 2. Numerical fracture network modelling : a discrete fracture network modelling approach in three dimensions was developed because of its flexibility and its realism. A numerical stochastic simulation enables to model any kind of fracture network while honouring field data and predefined geological constraints (such as strata confinement, relative chronology between several fracture systems, etc.). 3. Connectivity analysis of discrete fracture networks : a graph structure highlights connectivity relationships between the discrete fractures of a three-dimensional network. Several connectivity analysis methods, both qualitative and quantitative, are then outlined with an emphasis on how they help understanding the impact of fracturing on fluid flow.

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BibTeX Reference

@PHDTHESIS{Mace06,
    author = { Mace, Laetitia },
     title = { Caractérisation et modélisation numérique tridimensionnelle des réseaux de fractures naturelles },
      year = { 2006 },
    school = { INPL, Nancy, France },
  abstract = { Natural fractures have a dramatic impact on reservoirs either in fields such as mining and petroleum engineering
or hydrogeology. Acting as conductors or barriers, they often control flow and also storage capacity in such
reservoirs.
The presented work is part of the naturally fractured reservoirs numerical modelling pipeline, addressing
the specific issues of characterizing and modelling fractures in three dimensions. The proposed approaches
successively deal with the first logical stages of this modelling :
1. Characterization of natural fractures from structural data : a geomechanical and probabilistic approach
in three dimensions integrates tensorial strain data (obtained from forward or backward modelling techniques)
in order to compute new structural drivers of fracturing intensity and orientation. The proposed mathematical
framework also accounts for petrophysical rock property uncertainties.
2. Numerical fracture network modelling : a discrete fracture network modelling approach in three dimensions
was developed because of its flexibility and its realism. A numerical stochastic simulation enables to
model any kind of fracture network while honouring field data and predefined geological constraints (such as
strata confinement, relative chronology between several fracture systems, etc.).
3. Connectivity analysis of discrete fracture networks : a graph structure highlights connectivity relationships
between the discrete fractures of a three-dimensional network. Several connectivity analysis methods,
both qualitative and quantitative, are then outlined with an emphasis on how they help understanding the
impact of fracturing on fluid flow. }
}