Subsurface Computer Modeling, Inc.Grid Solutions III - Multiple Surface Modeling Techniques
Duration: Two (2) days
Class Type: Short lectures with many exercises on the computer
Who is qualified: Experienced Z-MAP Plus users (an intro Z-MAP Plus course and the Grid Solutions courses I and II
OR
broad experience in creating and editing single surface models with attempts at multiple surface mapping and volume calculations)
Who should attend: Any Z-MAP Plus user who:
  • Works with stacked horizons
  • Works with horizons that are truncated by or lap onto other horizons
  • Must build gross rock grids which incorporate single and multiple fluid contacts
  • Must calculate volumes which properly incorporate petrophysical models
What will they Learn:
PROBLEM
SOLUTION
Truncated horizons have a mix of erosional and depositional tops
Clarification of the data required to model an unconformity versus a depositional horizon
Lines of onlap, baselap and truncation are inaccurately defined for a horizon
Workflow for building horizons which have onlap and truncation incorporated into them
The sum of zone isochores contained between two defined horizons does not equal the thickness between the defined horizons
Workflow for prorating sub-isochores to fit into a total isochore
Gross rock grids intended for volumetrics contain unsupported thickness away from the "true" area of thickness
Workflow for building a gross rock grid and combining it with petrophysical grids to create a hydrocarbon pore thickness grid
Hydrocarbon pore thickness grids never match well data
Workflow for building a gross rock grid and combining it with petrophysical grids to create a hydrocarbon pore thickness grid
Overview: Grid Solutions III is a two-day course designed to help computer mappers incorporate the stratigraphic relationships that exist between horizons into grid models of those horizons and to calculate volumes between the grids. Three workflows are presented:
  • Conform-baselap-truncation
  • Proration
  • Volumetrics
The presentation emphasizes techniques for quickly creating geologically correct stacked horizons, calculating volumes between those horizons and generating maps of both the horizons and isochores between. Standard problems encountered in these activities are avoided by the use of macros and the workflows. The methods used in all three workflows are industry-standard and used daily by hundreds of mappers.

The course format consists of short introductory lectures interspersed with lab sessions demonstrating the use of the workflows and tools.

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