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Oil & Gas Training
and Competency Development
Competency Management system SLB NEXT

Integrated Play-based Exploration Principles and Processes: Play Identification, Evaluation, and Assessment

This 5-day course is about:
o Understanding plays and Play-based Exploration: Why Play-based Exploration is best practice
exploration? How is it used in the Exploration process?
o How to identify new plays using global concepts, understanding of basin types, petroleum system
principles, basic geological principles and “geo-logic”
? What makes a basin good for exploration?
? We know a lot…even when “we have no information”
o How plays are evaluated by mapping geological nature over their extent
? how the evaluation of conventional and unconventional plays differs
? Mapping play fairways
o How plays are “risked”: what is Play Chance vs. local risk. Common Risk Segment mapping
o Calculating Yet-to-find resources for conventional and unconventional plays
o How plays are used to decide where to explore next
o How the play’s evaluation and assessment is the fundamental for evaluating the assessing the
prospects in a play
o How to make a direct transition from the Play Assessment down to the prospect level thus
assuring prospect assessments that are geologically-based, objective, consistent and documented
and linked directly back to all the work done on the play.
This course is heavy on domain knowledge. This knowledge is mixed with lots of hands-on exercises that use the Petrel, PetroMod, and the Petrel Exploration Geology tools to do probabilistic Yet-to-find volumetrics and risking in GeoX.
The “traditional” method for doing Play Resource Assessment and creating the Common Risk Segment
maps that are the foundation of this process was the laborious and lengthy “light table method.” Results
of the petroleum system model were often not included.
In the digital world, the participants will learn to use Petrel (where the play fairway maps were created),
petroleum system modeling results (automatically imported from PetroMod into Petrel) to digitally
Schlumberger-Private
create Common Risk Segment maps that will be used with GeoX to do the probabilistic Yet-to-find
assessments.

Day 1

Fundamentals – Everything you need to know about Play-based exploration and Play
Resource Assessment
o Play-based Exploration and Play Resource Assessment: Why is Play-based Exploration
best practice? Why do we do it?
o The language of Play-based Exploration: Defining the basic terminology – Basin, Play,
petroleum system, lead & prospect, Assessment Unit (AU), Play resource assessment,
Play Chance vs. AU chance
o Identification of plays: How are plays initially identified? What to do when there is “no
data”
o Chance Mapping: Making Common Risk segment maps for plays. Defining Assessment
Unit Polygons
? TRCS chance mapping exercise – Basics for making common risk segment chance maps
with Petrel Chance Mapping tool to define assessment unit polygons for play resource
assessment
Learn the basic concepts and the reasons industry does play-based exploration (PBE).
Basic terminology of PBE. Play-based Exploration and connects the PBE analysis down to
the prospect level. Learn to make Common Risk Segments maps in Petrel more efficiently
than the old “light table” process. Learn to delineate the Assessment Units (AU) and how to
extract risk factors for each one for use in Play Resource Assessment

Day 2

Play Fairway Mapping – Making play-scale geological maps in Petrel that delineate the main
characteristics of the play
o Using Global concepts, regional knowledge, and geological principles in making play
fairway maps
o Reservoir: Making regional rock quality maps based on little data.
o Seal: Seal capacity mapping from facies and depth maps.
o Trap (Structure): Identifying the structural style for the play. Mapping areas with high
probability of structural and/or stratigraphic closure
o Charge: Identifying the effective source rocks. Using output from petroleum system
modeling: defining the Kitchen Area, migration pathways, generation and migration
timing, migration pathways
o Facies mapping of reservoir, seal, source
o Timing: Creating Petroleum System Events Charts to demonstrate timing of petroleum
systems feeding the play
o Wells: How to use wells in making play fairway maps. The pitfalls of well statistics
Schlumberger-Private
? Play Fairway Mapping exercise – Digitally make regional reservoir porosity maps, seal
capacity maps in Petrel. Import oil generation maps for charge from PetroMod 3D
mode. Define migration pathways from PetroMod 3D model and import into Petrel
Learn about making play fairway maps. What are the main elements of the play? How do
you make play fairway maps when there is little or no data

Day 3

Common Risk Segment maps & Composite Common Risk Segment maps from play
fairway maps. Stacking plays together. Defining Assessment Units
o Making Common Risk segment maps for plays: Digitally creating common risk segment
maps in Petrel Play Chance Mapping
? Segmented chance maps – creating “stair-step” functions to segment geological
maps into polygons
? Creating geopolygons automatically with Play Chance Mapping tool
o Cleaning up a “broken glass map”. Using Petrel to digitally eliminate the small residual
polygons and define the main Assessment Units
? Common Risk Segment (CRS) mapping exercise
? Transform play fairway maps into CRS maps.
? Stack maps into Composite Common Risk Segment (CCRS) maps
? Finalize Assessment Unit Polygons
? Extract input values for GeoX Play Resource Assessment analysis
Learn to make a Common Risk Segment Mapping over a play using the play fairway maps.

Day 4

Play Resource Assessment: Calculating the hydrocarbon potential in a play
o The language of probabilistic volumetrics: Defining the basic terminology- Yet-to-find,
Most-likely, Mean, P10, P50, P90, input distribution types (what to use), exceedance
probability outputs
? What is Play Resource Assessment? What is Yet-to-find?
? What is a National or Global Play Resource Assessment? Why do we do Play
Resource assessment?
? Different methods of Play Resource Assessment: Delphi, Analogues, Calculation
? Things we do wrong when doing probabilistic volumetrics on plays: Common
errors and what to do right
? Odds, Chance of Success, and Uncertainty: The difference. What does Play
Chance and Assessment Unit Chance mean? How are they used in the resource
assessment calculation?
o Setting up a conventional play assessment in GeoX, basic set up of GeoXplorer basin,
play, sub-play, Assessment Unit
o How GeoX calculates a play resource assessment for an AU. How GeoX sums AU’s
o Determining the input parameters for an Assessment Unit probabilistic volumetric
calculation:
? Assessment Unit Area
? Average Future Field Size Distribution
? Undrilled Feature Density
? Assessment Unit Chance of Success
? Adding discovered resources
? Extract AU risk factors from Petrel
Schlumberger-Private
o Combining Assessment Unit Yet-to-find with other AU’s to get Total Play YTF. Setting
up geological correlation of volumetric factors and risk dependencies between Common
Risk Segments
Learn the fundamentals of Play Resource Yet-to-find probabilistic volumetrics and COS
determination. Use GeoX to make assessments of volumes and risk on all AU’s in a play
and then combine them with the correct correlations and risk dependencies.

Day 5

Unconventional Resource Assessment
o What is an Unconventional Play? How does the calculation of Yet-to-Find differ from a
conventional play
o Defining the “sweet spot” Area
o Determining the input factor ranges
? Area of “sweet spot”
? Development well density
? EUR per well (Barrels of oil or cubic feet gas ultimately recovered from each
well)
? Well success rate vs. “sweet spot’ risk
Learn to use Petrel to identify the play’s sweet spots in an unconventional play. Assess the
recoverable resources for the sweet spots and on-sweet spots.

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