Fast seismic reservoir characterisation

Linking rock physics and seismic attributes into the 3D and 4D reservoir model.

RokDoc-ChronoSeis integrates your seismic interpretation with geology, rock physics and 3D inversion methods to develop robust 3D and 4D reservoir models.

RokDoc-ChronoSeis is a 3D/4D reservoir modelling and characterization tool with unparalleled functionality and versatility. Saturation and pressure changes are predicted from time-lapse seismic and production data in a 3D geological model. Predictions are validated with 4D seismic modelling. RokDoc-ChronoSeis unique gridless approach to building models on-the-fly from a recipe means that it is fast, flexible and easy to update; whatever the question, you get answers today, making it ideal for comparing options and scenarios as part of a reservoir modelling and simulation study.

NEW features in RokDoc-ChronoSeis v5.3

• ChronoSeis now has direct access to the RokDoc database. Well data, cross-plot polygons etc. created in RokDoc are available in ChronoSeis 3D/4D models.
• The new fast and interactive Stochastic Inversion module. Assess uncertainty in reservoir properties and reduce risk.
• The structural / stratigraphic framework definition has been automated whilst still allowing full user control. This makes setting up a model a much more intuitive process.
• Improved Seismic Net Pay Mapping. Statistical Wavelets for 3D/4D synthetics and inversion.

• Statistical Wavelets for 3D/4D synthetics and inversion. 3D geological models in depth can be created from time surfaces (and wells) using the new Geostatistical depth conversion.
• Calculate AVO attribute seismic volumes. A new trace calculator provides many standard calculations, including a user defined formula option.
• Import reservoir properties from Eclipse reservoir simulator models. In addition to the Petrel & RMS links, a new two-way connection with Eclipse is established.
• Saturations and pressures from Eclipse Restart time-step files can also be imported in order to make synthetic 4D seismic.
• Export reservoir properties as seismic data. Existing SEG-Y seismic datasets can now be replicated, but with a reservoir property in place of the seismic samples. Ensuring compatibility between the original seismic and the exported RokDoc-ChronoSeis property data.

Functionality available with RokDoc-ChronoSeis

• Non-geocellular chronostratigraphic geological modelling.
• 3D/4D reservoir modelling and well planning.
• Seismic attribute generation; geostatistical, inversion and neural networks.
• Planning and forecasting vertical, deviated, sidetrack and multi-lateral wells.
• Petro-elastic models.

The extensive capability available within RokDoc-ChronoSeis includes:

• Viewing the model with properties realised on the fly: fences, subcrop maps, stratigraphic, depth and time slices with greater detail at closer range.
• Apply 'cascade style' inversions to quantitatively predict reservoir properties away from the well.
• Seismic net pay analysis on thin reservoirs.
• Simultaneous views of multiple seismic stacks and attributes within the geological model.
• 2D/3D seismic modelling for stratigraphic model validation.
• Detailed geological model to reservoir simulation model for quick-look validation.
• Coloured inversion of seismic as a workflow element.
• Estimating reservoir fluid movements from 4D seismic anomalies in the 3D geological model.
• 4D synthetic seismic from an integrated reservoir model.
• Capability to date stamp all inputs for 4D studies.
• Date-dependent volumetrics and well forecasting.
• Combine seismic attributes to estimate reservoir properties (with neural networks & multi-linear analysis).
• Seismic impedance to reservoir quality by geostatistics.
• Simultaneous seismic event tracking and cross-plotting to define reservoir features.
• Remote team working and model synchronisation.
• Date-varying pressure properties. Create pressure property from Eclipse simulator time-step data in the same way as for saturations.

RokDoc-ChronoSeis 4D functionality focus:

All 4D models within RokDoc-ChronoSeis contain structure, chronostratigraphy, rock properties, date-varying seismic properties and date-varying fluid saturation and pressure properties. The models can be realised on-the-fly for any property at any date and are presented as cross-sections, slices or exported as cubes. RokDoc-ChronoSeis calculates date-dependent volumetrics and produces detailed well forecasts. If a consistent 4D seismic dataset is available, RokDoc-ChronoSeis can be integrated with a geological model (structure, stratigraphy, facies and porosity models) to predict fluid saturation and pressure changes.

4D modelling in RokDoc-ChronoSeis can be completed without any time-lapse or seismic data. Workflows include:

• Modelling compacting reservoirs.
• Synthetic seismic modelling to help assess the potential value of shooting a 4D seismic survey.
• Date varying volumetrics.
• 'What if' modelling using the date-varying fluid model e.g. how much gas is remaining if the oil-water contact rises by 100m?

RokDoc-ChronoSeis Neural Network functionality focus:

Date-dependent saturations and pressures are constructed within RokDoc-ChronoSeis using Neural Network technology. Multiple time-lapse acoustic and elastic seismic attributes, deterministic or stochastic static reservoir properties (porosity, perm etc.) and field data such as time-lapse logs, water-cut and/or pressure data are all used as inputs.

With advanced Neural Network and Geostatistical technology, RokDoc-ChronoSeis can produce powerful lithology and fluid predictions from seismic AVO attributes within the 3D geological

There is no faster way to get results from your 3D or time-lapse seismic.

With RokDoc-ChronoSeis v5.3 achieve:

• Efficiency - A single solution for 3D, 4D and multiple volume seismic handling, that speeds the interpretation workflow. It takes minutes to derive a fluid model, which can then be cross validated with the seismic model.
• Productivity - Gridless technology enables 'what if' and on-the-fly calculations. Increase understanding with rapid and easy iteration. Close the loop and improve communications with your engineers.
• Profitability - Reduce drilling and developments costs and shorten the time to reach first oil. Use existing well and seismic data to add value to upstream exploration and production assets.

RokDoc-ChronoSeis pressure and geomechanics functionality focus:

Pressure effects on acoustic properties:
Fluid properties: RokDoc-ChronoSeis fluid replacement functions for 4D synthetics take into account the changes in fluid density and compressibility due to pressure change between the reference date and the realization date of the synthetic. This part of the response is particularly important in gas fields and in oil reservoirs close to bubble-point.

Rock framework properties:
The gassmann fluid replacement option within RokDoc-ChronoSeis takes into acount the change in effective stress on the elastic moduli of the reservoir rock. This approach has specific benefit when considering overpressured oil reservoirs.

Compacting reservoirs:
Geometry: 4D synthetics in RokDoc-ChronoSeis use date-varying depth and time surfaces. This allows sections to be matched with the changed travel-times seen on real seismic and for date-varying depths to be incorporated into volumetrics and well forecasts.

Porosity:
With RokDoc-ChronoSeis make a compaction-dependent porosity property, using date-varying depth surfaces. A pressure-dependent porosity property used in 4D synthetics will automatically be taken into account in fluid substitution. Using this approach, subsurface teams will be able to model and analyse seismic responses in 3 dimensions, throughout the life of a field (and calculate remaining volumes at any date).

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