1. SLT Europe
Characterizing, Modelling and Simulating Naturally
Fractured Reservoirs
By
B. Gauthier, O. Gosselin and S. Grimaud
An initiative supported by the EAGE Student Fund including
EAGE, Shell, CGG and WesternGeco in addition to Total.

2. Fractures are the most common structural objects
From nice landscapes …
To daily life

3. They occur at all scales! After E. Le-Garzic et al, 2013

4. What defines a NFR ?
A Naturally Fractured Reservoir (NFR) is
characterised by the coexistence of a fracture
network and a matrix.
Theses two networks have different geometrical
characteristics, different porosities and different
permeabilities.
Each fracture type and scale may impact or not the
dynamic behaviour of the field
Fracture heterogeneities may
coexist with other heterogeneities
 NFR’s are complex reservoirs. Therefore, detailed
observation, description and understanding of their static
AND dynamic behaviours must be represented in the model.

5. What is the issue in NFR modelling and simulating ?
 How do we go from the fracture network to the flow network?
 The main questions for the flow network:
 Where are the fractures at wells, which drive the flows ?
 What is the reservoir (matrix and fractures) permeability ?
 Which is the geometry of exchanges between the matrix and the fractures ?
 Which is (will be) the multi phase flow behaviour while producing the field ?
Three flow
direction
Two flow
direction
One flow
direction
Actual NFR: a complex organisation of both
fracture and flow networks
NFR model: a simplified system
for the flow network only

6. Our Challenges
FC
HPF
BCF
X
X
?
Define the fracture scales which matter

7. Our Challenges
Therefore:
Use properly interpreted well data to characterize reliably fracturing at well;
Put in coherence geological, geomechanical and dynamic results to draw a full-
field fracturing concept for efficient fracturing and flow network,
Extrapolate at field scale static and dynamic fracturing parameters
Represent multiple scales of flow network with 2 available scales
NFR

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