Reservoir Risk Assessment (Jacta*) module integrates all of the reservoir knowledge and uncertainties to help you build thousands of valid models for a complete risk analysis. In a unique workflow, Reservoir Risk Assessment (Jacta) combines geometry, facies, rock, and fluid uncertainties to analyze reservoir volumes distribution and rank uncertainty parameters.

Reservoir Risk Assessment (Jacta) improves upon Monte-Carlo based techniques by honoring and highlighting the correlations between the different uncertainties. The Stochastic Reservoir Modeling Workflow used in Reservoir Risk Assessment (Jacta) is a series of nested simulations:

• Unit geometry
• Rock type in each geometry
• Rock properties (porosity, permeability) in each rock type
• Water saturation in each reservoir
• Contacts

Facies may be simulated per unit of the model and other properties may be simulated per facies or per unit, with the possibility to capture all the required dependencies between the various properties. In addition, users can insert their own properties anywhere in the workflow. For each modeling element, users are able to specify some degree of uncertainty.

Reservoir Risk Assessment (Jacta) includes a complete range of geostatistical algorithms for generating models. All geostatistical parameters can be assigned an uncertainty; these include, but are not limited to, facies proportions, reference histograms, all variogram parameters, correlation coefficients and any secondary data.

For the purpose of optimal memory management, Reservoir Risk Assessment (Jacta) does not store all the models on the disk or memory but allows users to recreate any of the simulated models at any time. A way to summarize all the multiple realizations is to provide users with an uncertainty cube in which averages and variances of any Reservoir Risk Assessment (Jacta) properties as well as composite properties are computed. 2D maps summarizing the uncertainty cube are also available

Uncertainty Viewer highlights the use of Categories, Average Properties, the evolution of the mean, and P90-P10 of oil in place as the number of realizations is increased.

A realistic range of volumetrics is established but beyond reporting volumes for defined regions, it is possible to compute connected volumes by specifying property thresholds, sets of producers and/or injectors.

A link with Microsoft Office Excel allows users to automatically export volumetrics and summary statistics in a report-ready format and also generate Tornado Charts, Crossplots and History Plots, which help to identify the key factors of uncertainty and to quantify their impact on the volumetrics.

Reservoir Risk Assessment (Jacta) Facilities Include:

• User-friendly interface to guide you through a systematic step-by-step approach
• Identification of the key uncertainty
• Quantification of the impact of uncertainty
• Generation of hundreds of complete 3D models ready to be exported to flow simulator
• Optimal memory management
• Gross rock and oil-in-place volume distributions from geological and structural uncertainties