ResAssure
A Revolution in Reservoir Simulation and
Uncertainty Modelling

www.StochasticSimulation.com
Presentation outline
•
•
•
•
•

ResAssure – An introduction
Philosophy
Where ResAssure fits into Reservoir Simulation
Driv...
What is ResAssure?

ResAssure is a revolutionary reservoir simulator integrated
closely to the latest MCMC techniques prov...
Why ResAssure is a revolution?
• It achieves incredible reservoir simulation speeds (~1000
times) compared to any conventi...
What is Stochastic Simulation?
• Evaluating very large numbers of simulation outcomes
and obtaining probabilistic forecast...
Outline of Presentation

•
•
•
•
•

ResAssure – An introduction
Philosophy
Where ResAssure fits into Reservoir Simulation
...
Key Insights
• Consistency between volumetric, material balance and fractional
flow places very strong constraints on feas...
Consistency: Material Balance Constraints

Volumetric
GRV, Structure,
Porosity, Net-sand,
Sw, GOC, OWC

Material Balance
P...
Key Insights
• Consistency between volumetric, material balance and fractional
flow places very strong constraints on feas...
Complexity

Percussionists at the Beijing Olympics – impressive but not complex
Stochastic Simulation

Copyright © 2013

1...
Complexity

Geological complexity is the main driver of reserves uncertainty
Stochastic Simulation

Copyright © 2013

11
Key Insights
• Consistency between volumetric, material balance and fractional
flow places very strong constraints on feas...
Reserves evolution with time

Wormhole of Reality
Stochastic Simulation

Copyright © 2013

13
Zone of Consistency
Low Consistency
Low Certainty

Most Likely Outcome

Medium Consistency
Medium Certainty

Volume

Press...
Outline of Presentation

•
•
•
•
•

ResAssure – An introduction
Philosophy
Where ResAssure fits into Reservoir Simulation
...
The Wheel of Reservoir Simulation
Model Application
(reserves estimation and
production forecasting)

Spatial & temporal
u...
ResAssure Workflow Position
Seismic
Interpretation

Production Data

Geological
Modelling

Single Reservoir
Model

(Petrel...
What Parameters Can Be Included?
Geophysics, Geology & Petrophysics
•

Depositional environment
- Geo Statistical property...
Comparison
ResAssure

Experimental Design/Proxy Surface

• 100,000’s realisations
• full 3D simulation for every
realisati...
Outline of Presentation

•
•
•
•
•

ResAssure – An introduction
Philosophy
Where ResAssure fits into Reservoir Simulation
...
ResAssure Workflow

Eclipse DataDeck
(or other format)

Convert to ResAssure
format

Review Model/Geology

View Results

S...
Perturbation Selection
Parameters are assigned to reservoir regions:


Equilibration



PVT



Fluid in Place



Satur...
Cloud Computing (Amazon Web Services)
• ResAssure – A Practical Solution
– Currently, small to medium simulations running ...
How is this speed achieved?
• ResAssure provides fully implicit simulation realisations
without using proxy or approximati...
Outline of Presentation

•
•
•
•
•

ResAssure – An introduction
Philosophy
Where ResAssure fits into Reservoir Simulation
...
Higher dimensional sampling
Mismatch function calculated for > 90,000 realisations using
trajectory sampling showing > 15 ...
History matching
Cross plots of kvkh, porosity and depth versus permeability for
best 800 history-matches

Each trend-line...
Geological sensitivities
Conventional History-Match cannot distinguish between downside
and upside cases
Downside Case

St...
Geological sensitivities
Section showing upside and downside top structure

“Flex” between upside and downside structure m...
Geological sensitivities
Stochastic Simulation showing degree of flexing between
Upside Case (-1.2) and Downside Case (0.4...
Geological sensitivities - Results
Most likely top structure is biased towards upside case

Stochastic Simulation

Copyrig...
Get in touch
To register your interest in ResAssure click here
Suite 3, 85 Guthrie Street, Osborne Park, Perth, WA, 6017
+...
Copyright © 2013
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ResAssure - The World’s Fastest Reservoir Simulator | A Revolution in Reserves Assurance and Uncertainty Analysis

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This Presentation Will:
1. Introduce a new way of evaluating reservoir uncertainty with RESASSURE
2. Illustrate the concepts used
3. Highlight the benefits achieved
4. Demonstrate the value of the results

Stochastic Simulation has unleashed the world’s fastest reservoir simulator, ResAssure, which is set to revolutionize production planning and reserves reporting in the Oil & Gas industry.

ResAssure easily computes > 1 Million realisations within a 24 hour period, a fraction of the time it currently takes with traditional methods and software packages. The release of ResAssure marks a significant milestone in the history of reservoir simulation – the first real industry technology advance in 30 years.

Dr Wadsley, Chief Technology Officer at Stochastic Simulation, commented “ResAssure is capable of quickly generating more accurate reserve estimates than is currently possible by any other software system. The approach taken generates a complete distribution of history matched models all of which are consistent with the geological model and observed production history. The time taken for this is orders of magnitude faster than current history matching methods.”

“Field development planning based on ResAssure’s distribution of models (rather than just upon a single history-matched model using conventional methodologies) will significantly reduce uncertainty and risk.” he added.

By enabling faster and more accurate analysis of dynamic subsurface geological data than has previously been possible, ResAssure markedly reduces the risk in the development of oil and gas fields by narrowing the range of uncertainty in reserves estimates: thereby supporting better production and financing decisions, with substantial increases in project ROI.

ResAssure’s innovation in reservoir simulation solves fully-implicit, dynamic three-phase fluid flow equations for every geological realisation. The speed breakthrough was achieved by a combination of proprietary algorithms, polygonal gridding and aggressive spatial coarsening and time stepping, based upon a conventional finite-difference discretization of the reservoir.

Key Insights Identified:
1. Consistency between volumetric, material balance and fractional flow places very strong constraints on feasible reservoir models.
2. The mathematics of reservoir simulation is NOT complex – it is the geology which is complex.
3. Reserves uncertainty is not quantified, but estimated from current ‘best’ estimate in an ad hoc unsystematic way.
4. What’s the point of preserving mass balance in the simulator when the hydrocarbons in the reservoir are imprecise and we don’t include all production data – mass balance should act to regularise our solution, not to define it.
5. The role of reservoir simulation is not to compute an exact solution of a poorly defined geological model – it is to define a range of feasible reservoir models and associated production forecasts.

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ResAssure - The World’s Fastest Reservoir Simulator | A Revolution in Reserves Assurance and Uncertainty Analysis

  1. 1. ResAssure A Revolution in Reservoir Simulation and Uncertainty Modelling www.StochasticSimulation.com
  2. 2. Presentation outline • • • • • ResAssure – An introduction Philosophy Where ResAssure fits into Reservoir Simulation Driving ResAssure from Eclipse Some Examples Stochastic Simulation Copyright © 2013 2
  3. 3. What is ResAssure? ResAssure is a revolutionary reservoir simulator integrated closely to the latest MCMC techniques providing rigorous subsurface quantification Stochastic Simulation Copyright © 2013 3
  4. 4. Why ResAssure is a revolution? • It achieves incredible reservoir simulation speeds (~1000 times) compared to any conventional reservoir simulator • It’s based on a significant innovation in numerical solution techniques • It is not a proxy solution • It provides fully implicit solutions for every geological realization Stochastic Simulation Copyright © 2013 4
  5. 5. What is Stochastic Simulation? • Evaluating very large numbers of simulation outcomes and obtaining probabilistic forecast distribution in the presence of uncertainty • Stochastic simulation of hydrocarbon reserves: – Narrows the range of uncertainty in reserves estimation – Better information for production and financing decisions – Reduces the potential for over- or under-investment • Learn about Stochastic Reservoir Engineering Stochastic Simulation Copyright © 2013 5
  6. 6. Outline of Presentation • • • • • ResAssure – An introduction Philosophy Where ResAssure fits into Reservoir Simulation Driving ResAssure from Eclipse Some Examples Stochastic Simulation Copyright © 2013 6
  7. 7. Key Insights • Consistency between volumetric, material balance and fractional flow places very strong constraints on feasible reservoir models Stochastic Simulation Copyright © 2013 7
  8. 8. Consistency: Material Balance Constraints Volumetric GRV, Structure, Porosity, Net-sand, Sw, GOC, OWC Material Balance PVT, Aquifer Influx Compressibility, Pressure Response Well Production Fractional Flow Water-Cut, GOR Stochastic Simulation Copyright © 2013 8
  9. 9. Key Insights • Consistency between volumetric, material balance and fractional flow places very strong constraints on feasible reservoir models. • The mathematics of reservoir simulation is NOT complex – it is the geology which is complex. Stochastic Simulation Copyright © 2013 9
  10. 10. Complexity Percussionists at the Beijing Olympics – impressive but not complex Stochastic Simulation Copyright © 2013 10
  11. 11. Complexity Geological complexity is the main driver of reserves uncertainty Stochastic Simulation Copyright © 2013 11
  12. 12. Key Insights • Consistency between volumetric, material balance and fractional flow places very strong constraints on feasible reservoir models. • The mathematics of reservoir simulation is NOT complex – it is the geology which is complex. • Reserves uncertainty is not quantified, but estimated from current ‘best’ estimates in an ad hoc unsystematic way. Stochastic Simulation Copyright © 2013 12
  13. 13. Reserves evolution with time Wormhole of Reality Stochastic Simulation Copyright © 2013 13
  14. 14. Zone of Consistency Low Consistency Low Certainty Most Likely Outcome Medium Consistency Medium Certainty Volume Pressure High Consistency High Certainty Production ResAssure finds the “Zone of Consistency” Stochastic Simulation Copyright © 2013 14
  15. 15. Outline of Presentation • • • • • ResAssure – An introduction Philosophy Where ResAssure fits into Reservoir Simulation Driving ResAssure from Eclipse Some Examples Stochastic Simulation Copyright © 2013 15
  16. 16. The Wheel of Reservoir Simulation Model Application (reserves estimation and production forecasting) Spatial & temporal upscaling Definition of model structure Model Formulation Model Characterisation Implementation Consistency checks, parameter estimation & data constraints Data Independent data & analogue studies Fit-for-purpose Assessment Validation Stochastic Simulation Copyright © 2013 Plausibility & evaluation of uncertainty 16
  17. 17. ResAssure Workflow Position Seismic Interpretation Production Data Geological Modelling Single Reservoir Model (Petrel, RMS) Reservoir Simulation Model (Eclipse, Tempest) History Matching Experimental Design (Cougar, EnABLE) “P90” “P50” Lo “P10” Mid Stochastic Simulation (ResAssure) Full Distribution of Reservoir Models • ResAssure leverages existing systems Stochastic Simulation Copyright © 2013 Probability Reserves Hi E X I S T I N G Reserves 17
  18. 18. What Parameters Can Be Included? Geophysics, Geology & Petrophysics • Depositional environment - Geo Statistical property interpolation - Facies and rock types • Structure, seismic picks, layer thickness • Fault position • Net-gross, porosity, permeability, fluid saturation Well Production Matching Fluid System • Matrix-fracture transmissibility • Fractional flow • Fault transmissibility • Decline curves • Fluid / rock compressibility • Oil, gas and water production • Aquifer recharge • Region and Well Pressure • Fluid Contacts • PVT properties • Relative permeability end-points Stochastic Simulation Copyright © 2013 18
  19. 19. Comparison ResAssure Experimental Design/Proxy Surface • 100,000’s realisations • full 3D simulation for every realisation • ~1000 times faster than conventional simulators • 100’s of perturbation modifiers can be simultaneously analysed • Any reservoir property can be included as all perturbations built into simulation engine • Multiple methodologies for exploring space of realisations • Limited number of full 3D realisations • Accuracy limited to resolution of proxy surface • Workflow time constrained by that of conventional simulator run time • Proxy surface resolution and exploration of parameter space limited by ‘curse of dimensionality’ • Modifications limited by model building work-flows Stochastic Simulation Copyright © 2013 19
  20. 20. Outline of Presentation • • • • • ResAssure – An introduction Philosophy Where ResAssure fits into Reservoir Simulation Driving ResAssure from Eclipse Some Examples Stochastic Simulation Copyright © 2013 20
  21. 21. ResAssure Workflow Eclipse DataDeck (or other format) Convert to ResAssure format Review Model/Geology View Results Stochastic Simulation Select Perturbations Launch ResAssure (using Amazon Web Services) Run Multiple Realisations Copyright © 2013 21
  22. 22. Perturbation Selection Parameters are assigned to reservoir regions:  Equilibration  PVT  Fluid in Place  Saturation  Boolean combinations (intersection/union) of these Each parameter is assigned:  Minimum  Maximum  Perturbation / Step Size  Probability Distribution (MCMC)  etc Stochastic Simulation Copyright © 2013 22
  23. 23. Cloud Computing (Amazon Web Services) • ResAssure – A Practical Solution – Currently, small to medium simulations running on a single thread generate approximately 500 ~ 2500 realisations / hour – Parallelisation on an 4 core high performance CPU realises almost linear speed-up to ~ 10000 realisations / hour – 24 hours of computing can generate > 100,000 realisations, each of which is a valid history-match or reservoir forecast This simulation speed is sufficiently fast to enable the working reservoir engineer efficient turnaround of stochastic simulation solutions within the working day. Stochastic Simulation Copyright © 2013 23
  24. 24. How is this speed achieved? • ResAssure provides fully implicit simulation realisations without using proxy or approximation techniques • The speed breakthrough is achieved by: – proprietary algorithms – polygonal gridding – aggressive spatial coarsening and time stepping • Fast history matching is achieved when the mismatch function (the difference between observed and calculated well rates and pressures) is accepted within error tolerance Stochastic Simulation Copyright © 2013 24
  25. 25. Outline of Presentation • • • • • ResAssure – An introduction Philosophy Where ResAssure fits into Reservoir Simulation Driving ResAssure from Eclipse Examples Stochastic Simulation Copyright © 2013 25
  26. 26. Higher dimensional sampling Mismatch function calculated for > 90,000 realisations using trajectory sampling showing > 15 distinct minima (history-matches) Stochastic Simulation Copyright © 2013 26
  27. 27. History matching Cross plots of kvkh, porosity and depth versus permeability for best 800 history-matches Each trend-line represents different history-match Stochastic Simulation Copyright © 2013 27
  28. 28. Geological sensitivities Conventional History-Match cannot distinguish between downside and upside cases Downside Case Stochastic Simulation Upside Case Copyright © 2013 28
  29. 29. Geological sensitivities Section showing upside and downside top structure “Flex” between upside and downside structure maps Stochastic Simulation Copyright © 2013 29
  30. 30. Geological sensitivities Stochastic Simulation showing degree of flexing between Upside Case (-1.2) and Downside Case (0.4) Stochastic Simulation Copyright © 2013 30
  31. 31. Geological sensitivities - Results Most likely top structure is biased towards upside case Stochastic Simulation Copyright © 2013 31
  32. 32. Get in touch To register your interest in ResAssure click here Suite 3, 85 Guthrie Street, Osborne Park, Perth, WA, 6017 +61 (08) 9446 2099 info@stochasticsimulation.com www.stochasticsimulation.com This project has been supported with assistance from the Australia Government through Commercialisation Australia. Stochastic Simulation Copyright © 2013 32
  33. 33. Copyright © 2013

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