M4 4 Make Zones Layering

7/25/2019 M4 4 Make Zones Layering

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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

M4 4 Make Zones Layering

Documents

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