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Module 4
3D Grid Construction
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Make Zones and Layering
Objectives
Isochore processing
Make Zones and Layering process
Stratigraphic intervals
Set parameters for Making zones and Layering
Apply adjustments to well tops
QC results in 3D.
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Processes used for 3D Grid Construction
3D Grid Construction
Structural FrameworkCorner Point Gridding
Fault Framework Modeling Fault Modeling
Structural Gridding Pillar Gridding
Make Horions/Zones/Layers
Fault Framework Modeling
Horizon
Modeling
Make Simple
Grid
Structural Gridding Structural Modeling
Make Horizons/Zones/Layers
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Allows for further refinement of the vertical resolution
of the 3D grid. Adds isochores, constants, etc. to the
framework to create additional horizons above,
below, and between the original horizons.
Pillar Gridding Make Horizons Make Zones LayeringFault Modeling
Structural Modeling
Make Zones: Process
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Make Zones: Stratigraphic Intervals
4. Input well tops if any.
1. Set the Stratigraphic interval.
3. Click the Multiple dropicon and insert
the isochores from the Inputpane.
2. Click Append number of zones
and set the input type.
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Make Zones: Zones Tab
Build from Volume correction Build along
Top Horizon
Isochores added from top
of interval.
Proportional correction
Splits the error proportionally
into the zones according to
relative thickness.
Vertical Thickness (TVT)
Base Horizon
Isochores added from
base of interval.
Equal correctionSplits the error into equal
proportions for each zone.
Stratigraphic Thickness(TST)
Both Base and Top
Horizon
Active only if a Rest zone
is defined. (all zones buildtowards it)
None correction
Will not make volume
corrections for all zones.
Along Pillar
Use when pillars are close
to vertical.
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Make Zones: Settings Tab
Minimum Cell Thickness
Sometimes when gridding thin layers, some cells can be defined to have zero thickness.
To be able to assign values to these cells, toogle ON the option to define a Minimum cell
thickness.
Use min. cell thickness
to collapse all thin cells less
than the given length (projectunits) to zero thickness.
No min.cell thickness
Min.cell thicknessStart from Base
Min.cell thickness
Start from Top
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2. On the Well Adjustment tab, choose Across
segmentor Inside segment only. Specify the
influence radius.
Make Zones: Well Adjustment Tab
3. Click Apply, and move into the next Stratigraphic
interval.
1. Make sure the well tops are included as input in the
Zones settings.
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Make Zones: Results
Before After
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Layering: Process
Defines the cells of the 3D grid. It is the final vertical
subdivision of the framework. The layers are part of
the zone but have no direct filter like Zones.
Pillar Gridding Make Horizons Make Zones LayeringFault Modeling
Structural Modeling
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Layering: Settings
1. Set the Zone Division (five types).
Proportional
Follow Base
Follow Top
Fractions
Follow Base
with Reference
2. Specify the number of layers (Proportional), cell thickness
(Follow top/Base), or relative proportions (Fractions).
3. (Optional) Input a Reference Surface (e.g., Clinoforms).
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Layering: Results
Types of Zone Division
Follow base
Proportional
Follow top
Fractions
Follow top + using a
depositional surface
Note: It is always a good idea to display edges in 3D to see all
updates before applying the Make Zones and Layering processes.
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Local Model Update for Structure
The Local model update adjusts horizons and
layers for selected regions while preserving all
3D properties in all cells.
1. Open the Local model update process and drop in thepolygon defining the area to be updated.
2. Drop in the input data to be used to guide the update
process.
3. Choose the horizons to recalculate and click
Apply.
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EXERCISE
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