Geo-X SIM GEOX Experience

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Resource Assessment Using GeoX: The Philippine DOE

Experience

Simplicio P. Caluyong

• Acknowledgement to the following:DOE – for allowing me to present some of the PhilPRA materialsGeoknowldge – for allowing me to use some materials from the 1st PPM Cambodia workshop

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Outline• The PhilPRA Project• PRA Methodology• Risking guidelines and Classification

system • GeoX Tools• Volumetric calculation• Conclusions

PhilPRA Project Profile

• Funding Agency: NORAD• Implementing Agency: DOE• Consultant: The Bridge Group AS• Technical Grant: NOK 5.548• Duration: Sept 2000 to March 2002

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Overview

• Establish a competent, professional group in DOE which in their own capacity can build and update a Petroleum Resource Inventory

• Publish the first issue of a Petroleum Resource Inventory of the Philippines

Main Objectives

Overview

• Develop a Petroleum Resource Classification System and Guidelines

• Develop a Risking System

Specific Objectives

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Output• Performed Basin Modeling on key basins• Performed Reservoir- and Production

Simulation on selected fields• Established routines for sustainable resource

assessment• Provided training programs• Compiled an overview of the Total Petroleum

Resources of the Philippines

Courses and education• Resource Assessment in a Resource

Management context• Data compilation and mapping • Resource assessment using GeoX • Basin modeling using Terramod • Reservoir simulation in PGS Headquarters in

Oslo, Norway• On the job training all throughout the project

period• Closing Seminar

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system • GeoX Tools• Volumetric calculation• Conclusions

Database• Seismic and other geophysical data

– More than 500,000 seismic line km• Well data

– More than 500 wells drilled• Onshore field data

– Samples (rock and seep)– Mapping

• Evaluations & Assessments– World bank report 1986– Contractor’s reports– Project reports and literature

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PhilPRA Work Flow

GATHER DATA

DIGITIZE PROSPECT

ANALYZE RESOURCES

IN GEOX

BUILD INPUT GUIDE

RESOURCE CLASSIFICATION SYSTEM RISK MODEL

GENERAL/PUBLISHEDREPORTS

BASINEVALUATION

REPORTSSEISMIC

WELL/PROD.

REPORTS

WELLLOGS

BASINOUTLINE/

POTENTIAL

PLAYTYPESPROSPECTS/LEADS

ROCK VOLUME VOLUME/RESERVOIR

DATA

PROSPECT ANALYSIS

(gProspectR)

DISCOVERYANALYSIS

(gDiscovery)

PLAYANALYSIS(gPlayR)

PORTFOLIOANALYSIS(gPortfolio)

DiscoveryAnalysis

Project Organization & Methods

Prospect Analysis Play Analysis

5Prospect input

to GeoX

2Digitizing/Mapping

1Reservoir/

Engineering

3Basin

Modelling

4Seismic Review/

Interpret.6

CRSMapping

7Play Analysis

In GeoX

8Support/QA/QC

PhilPRAObjectives

PhilPRAResults

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Petroleum System Concept

Reservoir/Seal distribution

Limit of mature and active Source

Play 2 (confirmed)Play 1

(unconfirmed)

Source Rock Distribution

Field/Discovery

Prospect

Geographical extent of Petroleum System

Definition of play types

• Defined based on the first order closure process (Duff and Hall, 1996)

• Emphasizes the closure as the key element of a play

• Identified six play families (AN, RB, FB, ST, MD, BD)

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Examples of play types

• Reef buildup family play (RB)– Main Process:

Biological and depositional processes

Example of play types

• Extensional fault block family play (FB)– Main Process:

Extensional tectonism

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system• GeoX Tools• Volumetric calculation• Conclusions

TOTALRECOVERABLE

RESOURCES

RESERVES POTENTIALRESOURCES

HYPOTHETICALRESOURCES

(MAPPED)

SPECULATIVERESOURCES(UNMAPPED)

PROVED UNPROVED

DEVELOPEDUNDEVELOPED

PRODUCING NONPRODUCING

PROBABLERESERVES

POSSIBLERESERVES

DISCOVEREDRECOVERABLE

RESOURCES

UNDISCOVEREDRECOVERABLE

RESOURCES

PROSPECTS LEADS CONFIRMEDPLAYS

UNCONFIRMEDPLAYS

MAY BEDEVELOPED

DEVELOPMENTNOT VERY

LIKELY

certainty

The Philippine Classification System

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Seismic mapping

Seismic line Prospect Lead

Prospect or lead?PROSPECT• A potential petroleum trap

defined by a grid of seismic lines (at least 2 lines)

• A mapped rock volume

LEAD• A potential petroleum trap

defined by only 1 seismic line

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Risk FactorsPlay:

Reservoir facies distributionSufficient mature source rockTiming

Prospect:Effective porosityExistence of StructureExistence of Effective SealMigrationRetention after Accumulation

PROSPECT ANALYSIS-RISKING

Pporosity (0.4) – there is limited data on turbiditic reservoirs, no onshore description.

Pgeom.body (0.9) – the structure is clearly defined by seismic data

Pseal (0.9) – good sealing mechanisms exist as seen from seismic

Pmigration (0.6) –good seismic data indicates probable source at the deeper parts,

Pretention (0.4) – the presence of late faulting as seen in seismic that may be reactivated.

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Play Analysis Methods

• Common Risk Segment maps (CRS)– Charge– Reservoir– Seal

• Composite CRS maps (CCRS)– For each play type

Reservoir facies PpTechnical tests criteriaPrf – Reservoir facies

Quantitative probability

range

One or more reservoir rock units are found in all wells in the play area.

Facies modeling and seismic data clearly indicates that the reservoir unit is also present in between wells.

0.8-1.0

One or more reservoir units are found in at least one well in the play area.

Convincing seismic data clearly indicate a regional distribution of the unit.

0.6-0.8

Based on the available data, it is equally probable that there is a regionally distributed reservoir unit as not. 0.4-0.6

Unconvincing seismic and/or well data indicate that a reservoir unit is present in the play area.

The presence is based on an analog model

0.2-0.4

• Unambiguous seismic data and well data establish that a reservoir unit is not regionally present in the play area. 0.0-0.2

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GeoX 5.03

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GeoX Tools

gPlayR gProspectR gFullCycle

DB

gPortfolioExcel, Spotfire etc.

Analysis Exportand Import

gField

gDiscovery

gProfile

GeoX

Source: Geoknowledge

Features of GeoX ToolsUniform & consistent syntaxThere is a common set of functions and options across tools for accessing, editing, estimating, storing, printing and exchanging analysis.Rapid calculation of simple analysisEasy to use, structured approach

Source: GeoX User’s Guide

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GeoX Setup in DOESystem

Client/server version, GeoX5.0.33 simultaneous licenses

ManpowerSystem Administrator3 users (GeoX assessment team in PhilPRA)

Data requirements in GeoXCultural & Geol. data Rock Volume

Volume &Reservoir

Parameters•Resource classification system

•Risk model

•Other cultural data (e.g. lithology, chronostrati-graphy, blocks)

•Gross rock volume; or

•Area, thickness, geometric factor

•Net to gross ratio

•Porosity

•Oil, gas saturation

•Fraction gas HCPV

•Recovery factor (O,G,C)

•Bo

•Bg

•GOR

•CGR

LOGNORMAL DISTRIBUTIONS

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Description page:Text summary Properties (subsurface, location, analysts)Strat columnBlocks (block description, license or contract)

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• Classification of the HC phases based on resource classification system

Note that the resource classification system was customisedduring the initial installation of GeoX.

Volume & reservoir parameters• Input parameter guide/table

Volume ParametersType of distribution Min Mode Max Data source

Gross rock volume (m3) Ln2LoHi Digitised map from company reports

Area (m2) Ln2LoHi Digitised map from company reports

Reservoir Thickness (m) Ln3Mod Well/general reports, logs

Geometric factor Ln3Mod Trap geometry multiplier, maps/reports

Net/Gross Ratio (decimal) Ln3Mod Well/general reports, logs, seismic sections

Porosity (decimal) Ln3Mod Well/general reports, logs

HC Saturation (decimal) Ln3Mod Well/general reports, logs

Trap fill Constant Well/general reports, logs

Fraction gas HCPV (decimal) Ln3Mod Well/general reports, logs

Recovery factor Oil (decimal) Ln3Mod Well/general reports, DST

Recovery factor Gas (decimal) Ln3Mod Well/general reports, DST

Recovery factor Condensate (decimal) Ln3Mod Well/general reports, DST

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Rock Volume• Get prospect/lead maps from

company reports.

• Screen area of prospect. Economic cutoff in PhilPRA (A >1million m2).

• Decide on the min and max closure.• Digitize the prospect contour map.• Convert to depth if necessary.• Calculate the GROSS ROCK

VOLUME directly (or Area) in GeoCad.

• Print a prospect structure map, pass on to GeoX assessment team.

Seismic

• Get the seismic sections that cross the prospect.

• Use the section:– To measure the reservoir thickness

(A * T * Geo. Factor =GRV)– In risking the prospect

Trap geometry multiplier (From White, 1987)

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• Input of volume estimates in the volume parameter page

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• Input reservoir data in the reservoir parameter page

Volume & reservoir parametersVolume & reservoir parameters

Reservoir ParametersType of distribution Min Mode Max Data source

Oil Form. Factor (Bo) (m3/m3) Ln3Mod depth dependent Vasquez-Beggs equation (reports, logs, DSTs)Gas Form. Factor (Bg*1000)(m3/1e3m3) Ln3Mod depth dependent

Well/general reports, logs, DSTs (equation of state)

Gas Oil Ratio (m3/m3) Ln3Mod depth dependent Vasquez-Beggs equation (reports, logs, DSTs)

Condensate Yield*1000 (m3/1e3m3) Ln3Mod depth dependent Company reports, logs, DSTs

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• Note that the risk model is customized during the initial installation of GeoX

Probability estimates in the risk parameter page

Results table in GeoX

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• Export results to excel– Calculate for total volume using mean values– Prepare plots

• Analyze data to rank prospects and leads as well as the ranking of all sedimentary basins as a tool for an effective strategy for exploration and investment promotion

What did DOE do with the results?

TOTAL RECOVERABLE RESOURCES

433

1283

0

500

1000

1500

2000

2500

3000

3500

Oil NatGas

Mill

ion

bbl o

.e

P95 P90 P75 P50 P25 P10 P05

NW Palawan

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Undiscovered resourcesTotal Oil Gas Condensate

Million bbl o.e. (Mean)

Million bbl

(Mean)

Billion cf (Mean)

Million bbl (Mean)

Undiscovered Resources 7,922 3,461 24,690 56 Hypothetical (Mapped) Resources 2,848 1,341 8,112 55 Speculative (Unmapped) Resources 5,074 2,120 16,578 0

Resource Class

OIL44%

GAS55%

CONDENSATE1%

TOTALRECOVERABLE

RESOURCES

RESERVES POTENTIALRESOURCES

HYPOTHETICALRESOURCES

(MAPPED)

SPECULATIVERESOURCES(UNMAPPED)

PROVED UNPROVED

DEVELOPEDUNDEVELOPED

PRODUCING NONPRODUCING

PROBABLERESERVES

POSSIBLERESERVES

DISCOVEREDRECOVERABLE

RESOURCES

UNDISCOVEREDRECOVERABLE

RESOURCES

PROSPECTS LEADS CONFIRMEDPLAYS

UNCONFIRMEDPLAYS

MAY BEDEVELOPED

DEVELOPMENTNOT VERY

LIKELY

Basin ranking

• Main ranking criteria– Total resource volume– Size distribution– Probability of Success (POS)

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Petroleum resource distribution

0

100

200

300

400

500

600

C Luzon

NW Pa

lawan

SW Pa

lawan

Visayan

Mindoro-Cuyo

E Palaw

an

Reed Bank

Cotabato

Sulu Se

a

Agusan-D

avao

SE Luzon

Cagayan

West L

uzon

Iloilo-W

MasbateIlo

cos

Bicol Sh

elf

CONDENSATEOIL

GAS

Million

bbl o.

e.

Size distributions

<60 60-300 300-600 >600Central Luzon 36 3 16 15 1 4Reed Bank 6 4 0 1 2 3SW Palawan 12 9 3 6 0 3Mindoro-Cuyo 45 4 15 22 6 2Agusan-Davao 9 2 2 3 3 1E Palawan 24 4 3 17 4 0NW Palawan 28 15 16 10 2 0Visayan 81 8.5 46 34 1 0Sulu Sea 21 5 8 12 1 0Cotabato 17 6 6 10 1 0SE Luzon 31 3 20 11 0 0Iloilo-W Masbate 3 2 1 2 0 0Cagayan 7 7.3 6 1 0 0W Luzon 7 1.3 7 0 0 0Ilocos 1 1.3 1 0 0 0Bicol Shelf 0 0 0 0 0 0

No. of Prospects /

Leads

Probability of Success

(% )

Size Distribution (Million bbl o.e.)Basin

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Ranking of basinsGroup A

1. Northwest Palawan

2. Southwest Palawan

3. Central Luzon

4. Visayan

5. Mindoro-Cuyo

6. Cagayan

Group B

1. East Palawan

2. Southeast Luzon

3. Reed Bank

4. Cotabato

5. Agusan-Davao

6. Sulu Sea

Group C

1. West Luzon

2. Ilocos

3. Bicol Shelf

4. West Masbate-Iloilo

PROSP

ECTI

VITY

PROSPECTIVITY



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Conclusions• GeoX as the main tool for resource volumetric

calculation have been very effective in the PhilPRA Project

• Version upgrades created some problems, particularly with analysis done by previous versions

• GeoX do not have the flexibility when presenting the results such as plots or graphs

• Overall support from Geoknowledge was excellent

GeoX tools purchased by the PPM Project

• gPlayR - play-level prospectivity and risk analysis

• gProspectR - prospect-level prospectivity and risk analysis

• gDiscovery - resources in a proven accumulation

• gPortfolio - resources in an asset portfolio

Source:Geoknowledge

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Thank you!

http://www.ccop.or.th/projects/PPM.html

Geo-X SIM GEOX Experience

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