présentation générale projet sid - international gas unionmembers.igu.org/old/igu...
TRANSCRIPT
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Summary - Overview about the studied area - Classical of natural fractures ( Cores, Images) - Applying the tectonic model of Riedel de 1928 - Special Core Analysis SCAL ( RMN sections, CT scans) - Observations and proofs of the fractal event - Fractal Propagations of the fractures corridors - Applying the méthodology on 1 development well - Applying same method for 13 others wells - Conclusions
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• Rhourde Nouss Central
• Rhourde Nouss South East
• Rhourde Nouss South West
• Rhourde Adra
• Rhourde Adra South
STUDIED STRUCTURES
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• Trend A : Rhourde Hamra
• Trend B : - RNNE
– RN Centre
– RN Sud Ouest
• Inter-Trend: B-C ; RNSE
• Trend C : - Rhourde Adra
– Rhourde Adra Sud
– Lobe RN-3
–Nord de Hamra
Major StructuralTrends
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•Petrography of Hamra Quartzites
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• Quartzites and quartzified sandstones tight and hard
• Clean constitution about 98 % of Silicium
• Invisible sedimentary patterns
• Strongly affected by multiple diagenetic phases
• Strongly fractured naturally in specific areas of the field
• Strongly affected by micro-fracturation
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Classical Analysis of
natural fractures
18 / 12 / 2013
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Natural fractures observed in a routine
core description
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Image analysis of the Hamra
Quartzites formation
Well A
StructuralDips : Undetermined
Direction of natural fractures :
WNW – ESE
Direction of In-Situ Stress :
NW – SE (δ1)
Sonatrach
Rhourde Nouss
A
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APPLYING THE TECTONIC MODEL OF RIEDEL (1928)
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Applying Riedel Model for Hamra Quartzites Formation
H max
H max h min
h min
Dextrial
Shear
Zone
R R’ : Conjugated Riedel fractures
Z : Maximum shortening axis
X : Maximum elongation axis
T : Extension fractures
P : Symetrical system of R
Remarque : angles are function of δ, in this
case δ=30°
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Segmentation of the structural
model
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Special Core Analysis RMN Sections
CT Scans
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WELL A
3416,0-3416,2
WELL B
3351,0-3351,2 CT Scan Natural open
fractures observed in CT scan and not by
eye
No natural fractures observed in CT Scan
(Tight Rock)
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Micro-fractures
WELL A
Thin Section 3416,0 m
(Oriented Core)
RMN Section b/w
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THEORY OF FRACTALS
A fractal is a natural phenomenon or a
mathematical set that exhibits a
repeating pattern that displays at every
scale. If the replication is exactly the
same at every scale, it is called self-
similar pattern. Fractals can also be
nearly the same at different levels.
The term "fractal" is a neologism
proposed by Benoît Mandelbrot in 1975
Dimension fractale de Mandelbrot (1979)
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The excellent fractal object
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FRACTAL CORRESPONDANCES
OBSERVATIONS AND PROOFS
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RMN SECTION VARIANCE CUBE
10 MICRONS 1 Km
FRACTAL CORRESPONDANCE ON AXIS X AND AXIS Y
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FRACTAL CORRESPONDANCE ON AXIS Z
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THE FRACTAL DIMENSION OF RHOURDE NOUSS-QH
Fractal Geometry of Hamra Quartzites Rhourde Nouss Region, 2012
When the fractal consists of replicas
of itself smaller, its fractal dimension
can be calculated as follows:
Where the fractal starting consists of
N copies whose size has been
reduced by a factor H (for scaling).
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FRACTAL PROPAGATION OF NATURAL FRACTURES CORRIDORS
Hamra Quartzites formation
RHOURDE NOUSS FIELD
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• Fractal propagation through Riedel Model
• Applying hidden well analysis for the reference well and compare real image analysis with the simulated corridors
• 75 % of correspondance with the reality.
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Reference
Well
Open Fractures in majority
Fractures partially or completely
closed
1st Well
Drilled based on
fractal prpagations δ1
δ1
A
B
WELL A WELL B
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RESULTATS DE L’ANALYSE DE L’IMAGERIE RELLE PAR RAPPORT AUX PROPAGATIONS FRACTALES
Reference Well Image Interpretation
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Before fractal propagation 24
DISCRETE FRACTURE MODEL OBTAINED FROM
FRACTAL PROPAGATION
After fractal propagation
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FINAL DISCRETE FRACTURE MODEL
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QH1
QH2
QH3
QH4
TOKYO University, 2012
Example of slented Well
Targeting Propagated
fracture corridors
Perfect Tree Model
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1 OF THE 12 EXAMPLES OF FRACTAL PROPAGATION FOR A GOOD DEVELOPPEMENT WELL
3 CORRIDORS OF PROPAGATED FRACTURES 3D STRUCTURAL MODEL
Open natural
fractures proved in
the reality
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Schematic cross-section
3D well section from fracture model
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CONCLUSIOINS
The fractal event was indeed proven to natural fractures Hamra Quartzite
Rhourde Nouss.
- A fractal geometry of natural fractures was created for the first time in a
Tight Gas Reservoir in Algeria.
-A method of fractal propagation for natural fractures was created in PED
Division / Sonatrach marking a new aspect of modeling.
-The Only wells that have not had the desired results are the exceptions
that proves the rule and define its limits.
-A modelling method has been optimized to produce the Tight Gas
reservoirs without using hydraulic fracturing.