Ultrascale Visualization for Giga-cell Reservoir Simulation Jorge - - PowerPoint PPT Presentation

Ultrascale Visualization for Giga-cell Reservoir Simulation

Jorge Pita, Nabil Zamel and Ali Dogru Saudi Aramco

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Outline

• Why giga-cell reservoir simulation ?
• Visualization challenges / solutions
• Future directions

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Why Giga-cell Simulation ?

• To obtain more accurate results
• To pursue high-definition in both geological detail

and fluid characterization

• To simulate giant oil reservoirs

…BUT can we manage/visualize the output ???

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Reservoir Simulation Practice (1990-2005)

…BUT, for many reservoirs, 10 million cells is not enough

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Coarse vs. fine-grid models

48-million-cell model vs. 192-million-cell model Water breakthrough mis-predicted by coarse model Fine-grid model agreed with field results

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Why Giga-cell Reservoir Simulation?

Full-field model (with just 51 layers)

 250 meters grid resolution 29 million cells  83 meters grid resolution 258 million cells  25 meters grid resolution (seismic bin) 2.9 billion cells  12.5 meters grid resolution (full seismic) 11.5 billion cells

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Molar Balance Equations:

i j ij P j j rj j i

q z P Kk t N +

• =
• =

) ( .

1

• µ
• i

g g i

• p

i i

y S x S V N n

• +

= =

One material conservation equation for each component: Volume balance equation:

n n n

• g

g w w

• +

+ = 1

Highlights of the Mathematical Model

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Thermodynamic Phase Equilibrium:

) ln( ln(

)

=

• i

L i i G i

x y F

• Natural Logarithm of the Fugacity Coefficient is given by:
• =

P

dP P RT V ) 1 ( ln

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VisIt Software on Supercomputers (1)

Visualizing 1-billion-cell model on Altix 3400 (27 cpu) Lawrence Livermore’s VisIt software (MPI-based) Client-server model for delivering results to engineer

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VisIt Software on Supercomputers (2)

Visualizing 16-billion-cell model on Altix 4700 (128 cpu) Lawrence Livermore’s VisIt software (MPI-based) Data load time: 1 minute; rotation/zoom = 5 seconds

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Octreemizer with dual-GPU display

2.4-billion cell model on dual-GPU Workstation Fraunhofer’s Octreemizer visualization software (LOD-based) Interactive visualization at the engineer’s desktop

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Giga-cell Simulation Via Adaptive Multi-level Methods

IBM Blue-Gene/P: Interactive giga-cell simulation ?

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Remote Visualization Austin-Dhahran

8000 miles distance from Texas to Saudi Arabia LLNL VisIt software running on TACC Ranger Virtual-GL + VNC remote visualization Ranger is a 62,000-core Sun Constellation system

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Remote Visualization Austin-Dhahran

Refresh rates are acceptable even on Windows XP laptop

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Future Directions

• Multi-modal “visualization” for giga-cell models
• See-touch-hear the data
• “Talking” simulator