M4 1 3D Grid Construction

7/25/2019 M4 1 3D Grid Construction

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Module 4

3D Grid Construction


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Petrel Workflow Tools

3D Grid

Construction

Structural Gridding

Stratigraphic

Modeling

Pillar Gridding

Well Log

Upscale

Facies &

Petrophysical

Modeling

Make contacts &

Volume Calculation

IntrotoPetrel

Interface

Workflow

Editor

Property Modeling

Make HorizonsZones & Layering

3D Grid Construction: Structural Modeling

Studio

3D Grid

Construction

Structural

Framework

Fault Modeling

Introduction Surfaces and

Data edit


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Objectives

Understand the main methods used to build a 3D grid:

Make simple grid process

Structural modeling Structural framework

Structural gridding.


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3D Grid Construction: Methods

Make simple grid

Corner point

gridding

Structural framework

Structural

gridding


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Processes used for 3D Grid Construction


Structural FrameworkCorner Point Gridding

Fault Framework Modeling Fault Modeling

Structural Gridding Pillar Gridding

Make Horizons/Zones/Layers

Fault Framework Modeling

Horizon Modeling

Make Simple Grid

Structural Gridding Structural Modeling


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Make Simple Grid Process

Surfaces Input data Make simple grid Make Zones Layering

Generates a simplified version of a 3D

grid. These grids are used when doing

simulation, velocity modeling, or making

grids with no faults.


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Processes used for 3D Grid Construction


Structural FrameworkCorner Point Gridding

Fault Framework Modeling Fault Modeling

Structural Gridding Pillar Gridding

Make Horizons/Zones/Layers

Fault Framework Modeling

Horizon Modeling

Make Simple Grid

Structural Gridding Structural Modeling


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Corner Point Gridding: Structural Modeling

Make Horizons Make Zones LayeringPillar GriddingFault Modeling

This is the classical process for making a

structural model in Petrel. It is subdivided into

three processes: Fault Modeling, Pillar Gridding,

and Make Horizons


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Structural Modeling: Input Data for Fault Modeling

Process

Interpreted Seismic

Fault Polygons Digitize on Fault Surfaces

Digitize on cross-sections

Digitize on Surfaces

Fault sticks


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Structural Modeling: Fault Modeling Process (1)

1. Define a Fault model. Before you start Fault

modeling, define and name a model that will

store the fault model and all 3D grids related to

that fault model.

2. Activate the new empty model and activate the

Fault modelingprocess.

The Structural modeling processes include the use of the Fault modeling and

the Pillar gridding processes together to create a skeleton framework.


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Structural Modeling: Fault Modeling Process (2)

3. Right-click the input data (fault sticks)

in the Inputpane and select Convert

to faults in fault model.

4. Specify to build a key pillar on every

5thfault stick and set the max search

distance to the nearest neighbor pillar.


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Structural Modeling: Key Pillars

Top shape point

Mid shape point

Base shape point

Line between pillars

Key pillar

The new faults are stored in the Faults model folder named after their input.

The faults consists of adjustable key pillars.Many shape points are defined by

the geometry selected before automatically converting data to faults in the fault

model (in this case, three point listric geometry).

Vertical ListricLinear Curved

Activate the Fault modeling process and

choose the fault geometry from the function bar.


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Structural Modeling: Automated Trimming of Faults

2. Choose All or Only selected pillars. Cut and extend to the limits

and click OK.

1. Select Processespane > Faultmodeling. On the Operations

tab, set the Top and Base limits, given by 2D grids.

The Key pillars generated by Corner point gridding must run

through the complete model area. Cut/extend pillars against a

surface or a given constant.

Pillars after Make

simple grid, vertical.Pillars after Corner Point gridding, with projected

path of pillars were they do not extend to the top.


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Structural Modeling: Automatic Connection of Faults

Remove distance:Removes pillars less

than the given distance from the connection.Extend distance:Searches for pillars

within the given distance and connect them.

Automatic fault connection:Faults close to each other, not cutting through, and faults overlapping

each other must be connected to build a proper lattice for the Pillar

gridding process. Normally used with clean orthogonal fault data.

Also used to find problems with fault intersections. After those have

been located and edited, auto connection can be run again.


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EXERCISE

Documents

M4 1 3D Grid Construction