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

Outline • Why giga-cell reservoir simulation ? • Visualization challenges / solutions • Future directions Ultravis08 Page Page 2 2

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 ??? Ultravis08 Page Page 3 3

Reservoir Simulation Practice (1990-2005) …BUT, for many reservoirs, 10 million cells is not enough Ultravis08 Page Page 4 4

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 Ultravis08 Page Page 5 5

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 Ultravis08 Page Page 6 6

Highlights of the Mathematical Model Molar Balance Equations: One material conservation equation for each component: N P Kk � i rj . ( P z ) q � = � � � � � � � + j ij j i t � µ j j 1 = N i n S x S y = = � + � i o o i g g i V p n n n o g w Volume balance equation: = 1 + + � � � o g w Ultravis08 Page Page 7 7

Thermodynamic Phase Equilibrium: G L F ln( y ln( x ) 0 � � � = i i ) i i � Natural Logarithm of the Fugacity Coefficient is given by: P V 1 ln � ( ) dP = � � RT P 0 Ultravis08 Page Page 8 8

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 Ultravis08 Page Page 9 9

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 Ultravis08 Page Page 10 10

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 Ultravis08 Page Page 11 11

Giga-cell Simulation Via Adaptive Multi-level Methods IBM Blue-Gene/P: Interactive giga-cell simulation ? Ultravis08 Page Page 12 12

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 Ultravis08 Page Page 13 13

Remote Visualization Austin-Dhahran Refresh rates are acceptable even on Windows XP laptop Ultravis08 Page Page 14 14

Future Directions • Multi-modal “visualization” for giga-cell models • See-touch-hear the data • “Talking” simulator Ultravis08 Page Page 15 15