Geovariances: Where no one has gone before

Isatis leading-edge technology allows to refine reserve evaluation and help to enhance profitability through the exploration and development stages of a reservoir.

"We classify Isatis as unique since it contains all the latest geostatistical algorithms that are being developed. We use Isatis in many phases of our reservoir characterization process, from exploratory data analysis to time-to-depth conversion and facies or petrophysical modeling to the simulation of many realizations of permeability for uncertainty analysis. Besides, we are really satisfied with the very close relationship Geovariances offers us; it allows our requests to be fast implemented in Isatis."
Rita Parisi Conde Pozzi - Geologist - Petrobras

 Overview

Isatis is a powerful and exhaustive geostatistical package which allows geologists, geophysicists and reservoir engineers simple or complex workflows for reservoir modeling and assessing the volumes and the uncertainties attached to their evaluation. Besides, Isatis full connectivity with usual market formats and its interfaces with GOCAD (from Paradigm), PETREL (from Schlumberger) and the RML (from Beicip-Franlab), makes the software a matchless tool for data integration.

 Benefits

• Make decisions based on evidence
• Get a risk indicator through the E&P cycle
• Increase data value by a secure quality process
• Enable team collaboration around a common database
• Obtain a realistic model when geology gets complex
• Back your reserve estimates on a full probabilistic framework
• Ensure clean archive of assets

 Solutions

• Get reliable velocity volumes
  
  
  • Investigate and clean your data with Isatis unique Exploratory Data Analysis interactive module.
  • Get your 3D velocity cube from 3D stacking velocity processing using kriging.
  • Extract attributes from a velocity cube along interpreted time horizon.
  • Remove acquisition artifacts and noise in velocity cubes through variogram decomposition in factorial kriging.

• Get consistent reservoir models
  
  
  • Time-to-Depth Conversion and Structural Modeling
    
    
    • Handle 2D and 3D faults from variography to kriging and simulations.
    • Perform accurate time-to-depth conversion by using multivariate kriging techniques controlled by seismic.
    • Quantify the uncertainties on surfaces using appropriate stochastic simulation algorithms.
    • Get the probability distribution of GRV with Isatis Volumetrics application.
    • Take advantage of the various arithmetical and morphological operators to derive additional attributes.
    • Determine the reservoir closure and identify the spill points.
  • Facies Modeling
    
    
    • Put the model in the original stratigraphic system by flattening the 3D grid.
    • Define the bedding geometry. Choose between parallel and proportional layering.
    • Build the 3D model of lateral and vertical facies distributions over the field from the Vertical Proportion Curves.
    • Distribute the facies over the 3D grid using the stochastic simulations, multiple points simulations. The various available techniques allow adapting the facies modeling to the amount of information and geology complexity.
  • Petrophysical Modeling
    
    
    • Populate the grid with the petrophysical properties (porosity, permeability, water saturation) from well logs using data integration techniques (co-kriging and co-simulations).
    • Get the optimistic and pessimistic scenarios with the appropriate stochastic simulation method.
    • Compute accurate volumes by zone, facies, stratigraphic units using the Volumetrics application.
  • Volumetrics
    
    
    • Use Isatis flexible Volumetrics module to get the probability distribution of HCPV, STOIIP, GIIP from the stochastic simulations.