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Applied Reservoir Simulation by Dr. Tayyar Sezgin DALTABAN 1 - 1
Chapter 1 Introduction
1.1 Overview
Numerical simulators have come to play an increasingly important role in theoil industry. Knowledge of their use, strengths and limitations as tools for the
evaluation and prediction of reservoir performance is valuable for
understanding and m1anaging petroleum reservoirs.
Prior to simulation, hand calculation methods were the basis for reservoir
management. Essentially, this required that elements of the overall problem
were de-coupled. Zero dimensional material balances, one and two-
dimensional flow analyses in single and two-phase flow, well performance and
lift were studied as separate independent problems. Success in applying the
highly idealized models depended on the engineer's skill in recognizing the
degree and the effects of interdependence and integrated concept of the wholeoperation.
The advent of computer simulation, enabling full coupling of all elements of
the system, with increasingly detailed characterization of the reservoir, has
changed the situation dramatically. Now many difficult development scenarios
can be applied to several different geological interpretations so that key
uncertainties can be identified and data acquisition programs defined.
The situation has changed from one where much of the available data was used
only intuitively (through a highly personal 'expert system') to one where the
modern system can accommodate explicitly more data than is generally
available. This has the additional advantage that feed back is now possible, theoutcome or implications of particular interpretations can be fed back to
individual specialists for revision or confirmation. The continued
developments in mathematical methods of manipulating equations (Finite
1.
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Introduction
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Figure 1-1:
o o o o
o o o
o o o o
o o o o
o o o
o o o o
o o o o
o o o
o o o o
C o r e
S e is m i c O u tc r o p P o r e S c a le
W e l l te s t W e l l L o g s
D a t a U p s c a l i n g / D o w n s c a l i n g
I n t e g r a t io n
, t )P (re
P (rw , t )
F in i te E le m e n t M e s h
F in i t e D if f e r e n c e M e s h
f o r M a c r o - F lo w
ii + 1
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Introduction
1 - 4 Applied Reservoir Simulation by Dr. Tayyar Sezgin DALTABAN
Figure 1-2:
Discovery 2D Standard Core Pressure PVT Well
Phase Seismic Well Log Measurements Measurements Analysis Tests
No?
Abandon
Field
Upscaling
ProductionPlanning
Reservoir
Simulation
O.K?
No!
Appraisal
Yes!Iterate?
Yes!
The Role of Simulation at Different Stages of Field Development
Appraisal 3D Production Interference Outcrop Tracer
Stage Seismic Logging Testing Surveys Testing
Upscaling
Revised
Production
Strategy
Update
Reservoir
Simulation
O.K?
No!
Appraisal
Yes!Iterate?
Yes!
No?
Abandon
Field
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Introduction
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Figure 1-3:
Additional Data
Development 4D Well Tracer Predrilled
Phase Seismic? Logging(Sor) Testing(Sor) Production
Prediction?
Predrilled
Production Prediction
UpscalingUpdate
Reservoir
Simulation
O.K?
No!
Continue
with
Installing
Platform &
Implement
Production
Strategy
Yes!Revised
Production
StrategyYes!
Iterate?
No?
What is
the next step?
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1.2 Aim of the Book
The book consists of a series of lectures, supported by carefully designed
tutorials. These will give participants the opportunity to vary key parameters in
the models and establish the impact on field performance.
This course intends to:
develop, a reasonable understanding of the mechanics of reservoir
simulation, which is one of the preconditions for the effective use of the
simulators by the engineers and geoscientists. Lack of this knowledge
and understanding means inputting information and getting results with-
out any appreciation of the relationship between them,
explain the limitations and the structural aspects of the models. If
these are not clearly understood, the users of the models will not be able
to prepare appropriate input data. discuss with and develop amongst participants a sufficient background
on engineering and geologic data acquisition techniques, data struc-
tures, and data processingtechniques,
review data scales and their interrelationships, soft data generation, and
in that respect, explain state of the art reservoir characterization and
reservoir model generationtechniques. Normally, reservoirmodels
are fine grid realizations of the reservoirs, and may comprise tens of
millions of grid blocks with currently available resources,
develop a sufficient background ongenerating reservoir models for
simulation. Due to restrictions in computational resources, the simula-
tion grid blocks are usually orders of magnitude greater than those usedin constructing fine grid reservoir models. This, therefore, requires
upscaling from a fine grid to a reservoir simulation grid. In depth dis-
cussion on the techniques used in single and multiphase case will be car-
ried out both under static and dynamic conditions. The accuracy of the
simulation model, therefore, depends strongly on the reservoir charac-
terization. As a consequence, incorrectly compiled data in building a
reservoir model, and improper use of upscaling procedures will yield
unacceptable results.
develop skills in conducting a simulation study, and framework for
checking the results, their quality and integrity. discuss the current modeling practices, the models available with
their unique features, and the degree of consistency among them.
form the necessary background on history matching using simulators.
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1.3 Definitions and Descriptions
The dictionary meaning of the word 'simulate' is to give an appearance of',' to
make so as to resemble the real or genuine thing ' or in other words 'to imitate
or create the conditions of'. The word Simulation refers to 'utilization of a
model to obtain some insight into the behavior of a real system'. To simulateany physical process is, therefore, a means to investigate behavior through a
system necessary which is called a model. Models can be of two types,
namely:
1. Physical Model: It is essentially a scaled down reproduction of the origi-
nal.
2. Mathematical Model: It is a system of equations describing the physical
behavior of the process of concern.
The core of the reservoir simulator is the mathematical model and in this
context a reservoir simulator can be defined as:
'The process of inferring the behavior of a hydrocarbon reservoir from the
performance of a mathematical model of that reservoir'
The mathematical model of a reservoir simulator is a set of partial differen-
tial equations with appropriate boundary conditions sufficient to represent
the physical processes that may occur in a reservoir. These partial differen-
tial equations are always non-linear meaning that the primary unknowns of
the system such as saturation, pressure and concentration exhibit non-linear
A typical flow equation is given below:
(1)
where is formation volume factor, t is time, S is saturation, x, y and z are
cartesian co-ordinate directions, is porosity, flow potential. If there are
three phases in a given medium (oil + water + gas), then, there are three
similar partial differential equations. In the above equation, permeabilities,
porosities, flow potentials, formation volume factors, viscosities are to becalculated simultaneously.
Except in a few simple cases like Buckley-Leverett type displacement
problems, an analytical solution to the partial differential equations cannot
be found due to these non-linearities. This has tempted mathematicians to
x-----
x-------
y-----
x-------
z-----
z-------
+ + t----
S
------- =
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explore approximate solution techniques to the full mathematical model
with complete reservoir description. These solutions are numerical in their
nature. Most frequently, there are two classes of numerical solutions used;
namely, finite element and finite difference methods. It follows from this
that a mathematical model should be translated into an approximate numer-
ical model. The reservoir simulator is then an implementation of numericalalgorithms on a computer in the form of software to find an approximate
solution to the mathematical model.
The approximate solutions to the flow equations are based on gridded real-
izations of the petroleum reservoirs. This is a final outcome of the efforts
summarized by Figure 1-1. For each node in the grid system, a value for
the following parameters is required:
Permeability
Porosity
Thickness
Elevation
Grid dimensions
Initial saturation for each phase
Initial pressure
Rock compressibility
Fluid characteristics are assigned by the following relationships:
Oil formation volume factor versus pressure Water formation volume factor versus pressure
Gas formation volume factor versus pressure
Oil viscosity versus pressure
Water viscosity versus pressure
Gas viscosity versus pressure
Solution gas-oil ratio versus pressure
Solution gas-water ratio versus pressure
Liquid to gas ratio versus pressure
Oil density Gas density
Water density
The interactions of forces between rock and fluids are given by the follow-
ing saturation dependent functions:
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Relative permeability for each phase
Capillary pressure between oil and water
Capillary pressure between gas and oil
Additional data may come from wells and include:
Producing interval.
Oil production rate versus time
Water production rate versus time
Gas production rate versus time
Observed pressure versus time
1.4 Major Steps in a Simulation Study
These are:
1. Reservoir Description:Starting with a meaningful subdivision of a given
reservoir into hydraulic units; further discretization of hydraulic units into
grid blocks, and arriving at estimates of the parameters in the governing
flow equations describes the process as a function of spatial position. The
parameter estimates have the meaning of average or pseudo values at the
scale of grid block in the discretized version of a continuous reservoir. The
deliverable will be a reservoir model. The resolution of the reservoir model
may go up to hundreds of millions of mesh points.
2. Recovery Mechanism Identification: The decision has to be made concern-ing the method of recovery like water injection, gravity drainage, natural
depletion, gas injection, etc.
3. Mathematical Model: Selection of mathematical model is required here
which may be black oil formulation, compositional formulation, single
phase model, multi-phase model, single dimension, multi-dimension, etc.
4. Engineering Model: This is also called simulation model. The objective is
to generate an acceptable representation of the reservoir based on the reser-
voir model generated. Due to computational resource limitations, the grid
to be used for the engineering model can be much coarser than the reser-
voir model (on the order of tens of thousands or hundreds of thousands). Tothis end, some upscaling efforts are carried out.
5. Numerical Model: There are several different numerical models available
including: Finite Element Model, Finite Difference Model, Boundary Inte-
gral Model, and Streamlines Model. Among these, the Finite Difference
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1.5 Classification of Simulators
1.5.1 Classification Based on Linearization
Due to strong non-linearity of Equation (1), it is necessary to
linearize it to obtain unknown parameters. Hence, the firstclassification of the simulators is based on the linearization technique
used. There are two generic techniques, namely:
IMPES: Implicit Pressure and Explicit Saturation. In this application,
flow equations of water, oil and gas are coupled and solved first for
pressure and then saturation. This technology assumes that the
change in capillary pressure over a time step should be negligible. In
addition, the pressures are calculated by the old time level saturation
and pressure dependent parameters. They are updated after pressures
and saturations are updated.
Fully Implicit: In this application, all of the unknowns are solved
simultaneously. The flow equations are linearized by using
Newtonian approach.
1.5.2 Classification Based on Fluid Characteristics
Simulators are classified based on fluid characterization as Black Oil
Simulators or Compositional Simulators.
1. Black Oil Simulators: This type of simulator treats hydrocarbons
as two components; gas and oil. They are applicable to dissolved
gas, medium gravity oil-bearing reservoirs under moderate reser-
voir pressures and temperatures. They can be applied to almost all
conventional water flooding simulation studies. If the oil forma-
tion volume factor is less than two, they can safely be applied to
solution-gas drive, gas cap expansion or gas injection studies.
Black oil simulators can also be used for some cases where the
formation volume factor is greater than 2. That is possible if oil
and gas formation volume factors, gas in solution, and oil and gas
viscosities, are plotted as a function of pressure and can be deter-
mined accurately by calculation or experiment.
2. Compositional Simulators: Compositional simulators are those
which use cubic Equations of State forms like Peng Robinson,
Soave-Redlich-Kwong, Redlich-Kwong, Schmidt Wenzel and Pa-
tel-Teja. Instead of tracking the phases, as in Black Oil Simula-
tors, track constituent components of hydrocarbons like Methane,
Ethane, Butane, Propane, Nitrogen, Carbon Dioxide, etc. Because
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of this multicomponent treatment of reservoir fluids, the simula-
tion is capable of handling:
Enhance Oil Recovery by carbon-Dioxide or enriched gas
injection, Multiple Contact Miscibility studies
Natural depletion and Injection of Gases such as Nitrogen orresidue gas into gas condensate reservoirs.
Natural Depletion or Gas Injection into Volatile Oil Reser-
voirs.
Re-evaporation of residual oil by injecting residual gas
Despite the excellent capability of simulating the compositional
phenomena in gas condensate reservoirs, compositional simulators
can be as much as 100 times more expensive than black oil
simulators. The main source of this additional computation cost is the
Equation of State (EOS) calculations (which may be up to 80% of the
total cost).
1.5.3 Classification Based on Temperature Dependence
Isothermal: Simulators that consider the temperature of the reser-
voir constant
Thermal: In this case the following equations are involved:
1. Energy equation.
2. Oxygen for in-situ conditions
3. Gas for in-situ conditions4. Hydrocarbon components: light, medium and heavy compo-
nents may be necessary
5. Phase: gas, liquid and solid phases (4 phase: oil + water + gas
+ solid)
1.5.4 Classification Based on Grid Dimensions and Types
(See Figures 1-4 to 1-8):
1-Dimensional: These models cannot be used for fieldwide
simulation applications because they cannot handle either arealsweep or the gravity effects. They can be used for sensitivity towards
some selected reservoir parameters prior to full-scale simulation. The
effect of viscous forces and mobility ratios on the recovery can be
tested. They are especially used for testing the accuracy of the
simulators against known analytic solutions like that of Buckley-
Leverett. Also, most of the finite difference techniques can be tested
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first with one-dimensional case and then their use can be extended to
multi-dimensions. They are also useful in assessing the heterogeneity
in the direction of flow.
1-Dimensional Cartesian - Horizontal.
1-Dimensional Cartesian -Vertical: These are usually used for
vertical equilibrium.
1-Dimensional Radial: In addition to general objectives as stated,
they are also used for assessing the productivity impairment in gas
condensate reservoirs as well as volatile oil reservoirs. They can also
simulate well testing (i.e. radial flow).
Figure 1-4: Grid Dimensions
X
(a) 1-D Linear
(b) 1-D Radial
Z
(c) 1-D VE
r
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2-Dimensional: These include areal cartesian, areal radial and cross-sectional
cartesian, and cross-sectional radial models.
2-Dimensional Cartesian Areal: Although petroleum reservoirs are three
dimensional, in some cases, especially for thin reservoirs where gravita-
tional effects are negligible, Z-direction may not be important. Under thecircumstances, these type of models are used when areal flow patterns
dominate the reservoir performance; and if the areal heterogeneities are im-
portant. Most areal models use pseudo functions to account for flow in ver-
tical direction. However, they are not necessary if the reservoir is thin and
stratification is not important. Under the circumstances, normal reservoir
engineering studies can be carried out with these models including well po-
sition optimization; distribution of injection and withdrawal rates; timing
for installation of artificial lift and modification of surface facilities.
2-Dimensional Radial Areal: This model investigates the effect of well
performance as in the case of 1-Dimensional radial models, with the addi-tion of areal heterogeneities.
2-Dimensional Cross-sectional Cartesian: In this case, instead of ne-
glecting flow in the vertical direction, one of the horizontal directions can
be discounted. This type of model can be used in cases where vertical flow
is dominant. A highly stratified reservoir is a typical case study for this
type of model. The effect of segregation and the effect of stratification are
the main focus areas in this type of modeling. They are also used in devel-
oping well functions, pseudo functions and coning functions; simulating
peripheral gas injection. Crestal gas injection, or other processes in which
frontal velocities toward producers are largely uniform help to justify sim-plification in modeling of entire fields or field segments. Studying miscible
processes to assess the gravity and heterogeneities on displacement effi-
ciency and the sweep efficiency are also candidates.
2-Dimensional Cross-Sectional Radial: This model is also applied to res-
ervoirs where gravity forces and stratification dominate the flow, and areal
property distribution of the reservoir is relatively homogeneous. This ap-
proach is used particularly to investigate the coning problem. They can also
be used to develop coning functions and well functions.
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Figure 1-5: Grid Dimensions
AREAL-CARTESIANCROSS-SECTIONAL CARTESIAN
AREAL-RADIAL
CROSS SECTIONAL RADIAL
2-DIMENSIONAL DOMAN
REALISATIONS
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Figure 1-6: Grid Dimensions
7800
7400
7000
6600
6200
5800
7800
7400
7000
6600
6200
5800
Block Centered Geometry XZ plane
3000 4000 5000 6000
3000 4000 5000 6000
Corner point Geometry XZ plane
orner Point Geometry
lock Centered Geometry
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3-Dimensional Models: They can be Cartesian, Radial-Cylindrical or
Spherical.
3-Dimensional Cartesian: Reservoir geometry can sometimes be too
complex to be represented by two-dimension. For example, reservoirs hav-
ing shales or other flow barriers that are continuous over large areas, butwith permeable windows where crossflow occurs, are difficult, if not im-
possible, with two dimensions. Reservoir mechanics may be so complex
that two-dimensional realizations are difficult to analyze. Reservoirs which
are at a more advanced stage of depletion fall into this category and require
careful and precise modeling to distinguish between performances result-
ing from alternative depletion plans. The displacement to be studied may
be dominated by vertical flow as, for example, near wells where both cusp-
ing and coning may occur. Both areal and vertical details needed can be ob-
tained only in a 3D segment model. Occasionally 2-D studies are more
troublesome and expensive than 3-D modeling. Reservoirs with a complex
facies structure may require an excessive number of pseudoisations to berepresented with two dimensions.
3-Dimensional Cylindrical: This model has the same objectives as 1-D ra-
dial, 2-D Radial areal and 2-D radial cross-sectional models. In addition, it
is able to capture the impact of vertical and areal heterogeneities on the
flow.
3-Dimensional Spherical: This approach is used to investigate the partial
penetration effects on well testing results and to model minipermeametry
flow.
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1.6 Benefits of Reservoir Simulators
The reason for using reservoir simulators is to estimate reservoir performance
under a variety of production schemes. We have only a single opportunity to
produce from an actual reservoir with a considerable expense whereas with
simulation we can test several alternatives and assess them prior to decidingthe actual field operation. The cost of simulation is considerably cheaper and
the time necessary is usually negligible to the actual operation. Some of the
applications and the benefits of the simulation can be summed up as follows:
1. The performance of a hydrocarbon reservoir under natural depletion, water
injection or cycling can be examined.
2. Type of water flooding can be judged. For example, it is possible to see the
relative merits of flank water injection and pattern waterflooding.
3. The effect of well location and spacing can be critically evaluated.
4. The effect of the production rate on the hydrocarbon recovery can be esti-
mated.
5. For a given number of wells at certain specified locations, it is possible to
predict total field gas deliverability.
6. In heterogeneous hydrocarbon reservoirs, it is possible to estimate the lea-
seline drainage.
7. To maximize hydrocarbon recovery, best methods of field development
and production schemes can be found.
8. Best Enhanced Oil Recovery (EOR) scheme and its implementation can be
determined.
9. The reasons why the reservoir behavior deviates from the earlier predic-
tions can be explained.
10. The ultimate economic hydrocarbon recovery can be predicted.
11. Laboratory and field data requirements and their subsequent effect on the
performance predictions can be assessed.
12. The best completion schemes for the wells can be established.
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13. The section of reservoir from which the hydrocarbon is produced can be
identified.
14. Critical parameters to be measured from the field in an application of a re-
covery scheme can be identified.
15. It is possible to decide whether it is necessary to do physical model studies
of the reservoir and if so how can the findings can be scaled up for field ap-
plications.
1.7 ECLIPSE State of the Art Reservoir Simulator
Immense advances in the areas of data acquisition and integration, especially
in the last 10 years, dictate ever increasing complexities in reservoir
description in order to model reservoir behavior. The detail required by
reservoir management and the detail introduced by the integratedmultidisciplinary reservoir characterization efforts, require robust and fast
simulation technologies which are parallelisable and cost effective. These
technologies must be able to cope with all of the complexities of the field
production and operations and must be flexible to absorb new concepts. They
must be user friendly as the ever-growing demand for the simulators
encourages non-specialists to make use of them in their day to day field
management efforts. In this respect, the front-end processors of such
applications must be able to detect the physical inconsistencies in the input
data to a measurable degree. The increasing demand for the simulators also
dictates that simulation software be available for PC's as well as workstations.
The pre and post processing facilities must be extremely powerful so thatengineers and geoscientists can monitor their simulation studies efficiently.
Integration of various different data processing and simulation modules and
data transferability between them is another important aspect required within
the current reservoir management environment. In fact, the advances in data
exchange and integration between different disciplines in the recent years have
begun forming the firm and necessary basis for multi-disciplinary co-operation
and working.
ECLIPSE has been a leading state of the art software in the oil industry
dominating currently 70% of the market. Some of the main reasons for its
dominant role in the oil industry are its stability, robustness, and high degree ofmaterial conservation, mathematical accuracy and flexibility. The available
functions of the ECLIPSE are summarized in the form of need and solution:
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NEED SOLUTION
Handling multi-phase flow problems Eclipse 100, Eclipse 200 and Eclipse 300
Handling Complex Geometries Block-center geometry, Corner Point Geometry, Unstruc-
tured Gridding, Pebby/Voronoi Gridding, Non-Neighbor
Connections and Local Grid Refinement
Unconditional stability and robustness Fully Implicit
Compromise solution between accuracy and
computational speed
IMPES and Adaptive Implicit
Modeling Structural Geological Features like
faults
Non-Neighbor Connections
Flexibility in Model Size and Representation Run Time Dimensioning
Modeling Segregated flow in vertical direction Vertical Equilibrium
Fractured Reservoir Modeling Dual Porosity and Dual Porosity/permeability options
Relative Permeability and Capillary Pressure
Treatment
Directional Relative Permeabilities, Relative Permeability
and Capillary Pressure hysteresis, Saturation Table Scaling
Gas Field Operations, Gas Lift Optimization ECLIPSE 200
PVT Data ECLIPSE 100 and 200 for Black Oil data ECLIPSE 300
for Compositional data, API Tracking
Modeling Flow of Methane in Coalbed ECLIPSE 200
Collapse of pore channels due to change in the
pore pressure
Rock Compaction Option
Designing and modeling single well and inter-
well tracer testing
Tracer Tracking
Cold water injection into a reservoir cooling
effects need to be handled, energy conservation
must be maintained
Temperature Model
Modeling First Contact and Multiple Contract
Miscibilities
ECLIPSE 300 compositional formulation ECLIPSE 100/
200 three component model to handle First Contact Misci-
bility
Managing Field and Well schedules Individual Well Controls Group and Field Production Con-
trols Multi-Level Grouping Hierarchy Group Injection
Controls Sales Gas Production Control Crossflow and Co-
mingling in Wells Highly Deviated/Slanted and Horizontal
Wells Special Facilities for Gas Wells Surface Networks
Modeling Polymer, Surfactant and Foam ECLIPSE 200
Accurate Distribution of Initial Fluid in Place Fine Grid Equilibration
Aquifer Modeling Non-neighbor Connections Analytic Aquifers (Fetkovitch
and Carter Tracy) Numerical Aquifers
Interpolation of sparse data FILL Program
Flow in the Wellbore VFP Module comprising the following options:-Aziz,
Govier and Fogarasi Orkiszewski, Hagedorn and Brown,
Beggs and Brill Mukherjee and Brill, Gray
Pre and Post Processing Facility GRID, GRAF, and RT View
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Well Test Interpretation and Analysis Well Test 200
Accurate and Efficient Preparation, Evaluation
and Quality Checking of the Well Production
and Completion Data
SCHEDULE
Relative Permeability and Capillary Pressure
Pseudoisations
PSEUDO
Coupling Multiple reservoirs and Paralleliza-
tion Compatibility
ECLIPSE 200
Between Different Modules YES
Automatic History Matching Sim Opt
NEED SOLUTION
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References
Ames, W.F. (1969):Numerical Methods for Partial Differential Equations,
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