M4 2 Pillar Gridding

Module 4 3D Grid Construction

Petrel Workflow Tools Introduction

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Surfaces and Data edit

Stratigraphic Modeling

3D Grid Construction: Structural Modeling

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Pillar Gridding

Fault Modeling 3D Grid Construction Structural Framework

3D Grid Construction Structural Gridding

Property Modeling

Well Log Upscale

Facies & Petrophysical Modeling

Make Horizons Zones & Layering Make contacts & Volume Calculation    r    o     t     i     d     E    w    o     l     f     k    r    o     W

Pillar Gridding Objectives 

Understand Basic Terminology/ Concepts  –  –  –  –

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Define the process of Pillar gridding  –  –  –  –  –

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Boundaries Segments Directions Trends. Define boundaries Settings tab Set directions and trends Define segments Refining grid.

Discuss Editing Options: Edit the fault model QC of Skeletons: Intersections and segments

Processes used for 3D Grid Construction 3D Grid Construction Corner Point Gridding

Structural Framework

Structural Gridding

Fault Framework Modeling

Fault Modeling

Structural Gridding

Make Horizons/Zones/Layers

Fault Framework Modeling

Horizon Modeling

Make Simple Grid

Pillar Gridding Process Based on the previously generated key pillars, normal pillars are now established throughout the reservoir from set parameters including, e.g., the boundary and grid increment. Preview skeleton based on mid-points of Key pillars

Output skeletons established from top, mid, and base points of the key pillars

Structural Modeling

Fault modeling

Pillar Gridding

Make Horizons

Make Zones

Layering

Pillar Gridding Process Based on the previously generated key pillars, normal pillars are now established throughout the reservoir from set parameters including, e.g., the boundary and grid increment.

Preview skeleton based on mid-points of Key pillars

Output skeletons established from top, mid, and base points of the key pillars

Structural Modeling

Fault modeling

Pillar Gridding

Make Horizons

Make Zones

Layering

Overview Pillars: Lines that define the corners of 3D cells. In the Pillar gridding process, they are still virtual until the process is completed.

Pillars

Pillars + Edges

Note: This illustrates the concepts of cells but skeletons do not define physical cells yet .

Pillars + Edges + Base & Top = Cells

Terminology Boundary Polygon, boundary segment ,or part of boundary. Trends Guidance for the grid cell shape and orientation. Can be used as segment divider where there are no faults. Directions Guidance for orientation of cells along faults. Segments Faulted compartment closed by faults and/or trends and/or grid boundary.

Directions and Trends J-direction

I-trend

I-direction

 Arbitrary

J-Trend

Workflow: Pillar Gridding 1. Start the Pillar gridding process. 2. Define the boundary. 3. Define grid name and increment. 4. Build mid-skeleton grid and click Apply. 5. Tune mid-skeleton grid.

6. Extend pillars to top and base skeletons and click OK.

Results/QC  After clicking OK in the Pillar Gridding dialog, Petrel generates a new 3D grid in the Models pane containing three skeleton grids. To QC the skeleton grid, use the Intersections found under the Intersections folder. Highlight one of the intersections, toggle ON Show Pillars and use the Grid player to move in the I or J direction to look for poorly truncated pillars or spikes in the skeleton grid.

Top skeleton Mid skeleton Base skeleton

Segments 1. Change the style settings for the skeleton: Double-click on the Skeleton folder and on the Style tab, Solid subtab, select Show Solid: As Segments. 2. Check segments: Use the Segment Filter to select on/off or make a visual display of segments as a legend by right-clicking on the Segment filter, selecting Insert/update template, and toggling it ON from the Templates pane.

EXERCISE