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CEGAL.COM *Petrel is a mark of Schlumberger • Jointly inverts to both facies and rock properties (Porosity, net to gross) • Simultaneous inversion of color inverted angle stacks • Follows real well facies distributions and rock properties by computing thousands of statistically correct pseudo wells per trace • No low frequency model required • No lateral / spatial constraints • Best matching pseudo wells are se- lected to provide rock property values and their associated uncertainties HIGH QUALITY IMAGES OF RESERVOIR PROPERTY ESTIMATES AND ASSOCIATED UNCERTAINTIES 3D views of Net Fraction, a part of lithofacies and higher porosity zones after voxel transparency at the target reservoir zone BLUEBACK ODISI ONE DIMENSIONAL STOCHASTIC INVERSION BLUEBACK ODiSI is a One Dimensional Stochastic In- version method that produces high quality reservoir property estimates with associated uncertainties, to predict net fraction, porosity and lithofacies distribution in geological plays. It is a unique seismic inversion method that speciﬁcally includes only the most robust prior information in order to apply additional constraints to the solution. Blueback ODiSI does not require any prior lateral constraints: the algorithm converges so that each trace can be inverted independently of its neighbors yet lat- erally continuity is still achieved. The technology was originally developed by BP (Con- nolly & Hughes, 2013, 2014, 2016) while a Petrel* version has been developed jointly by Cegal and BP. The solution is robust yet logical and comes fully inte- grated into Petrel, complementing Cegal’s Quantitative Interpretation solution Blueback Rocks QI. INPUT Color Inverted Extended Elastic Impedance (EEI) OUTPUT ODiSI Inverted Net Fraction ODiSI Inverted Lithofacies

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CEGAL.COM

*Petrel is a mark of Schlumberger

• Jointlyinvertstobothfaciesandrockproperties(Porosity,nettogross)

• Simultaneousinversionofcolorinvertedanglestacks

• Followsrealwellfaciesdistributions

androckpropertiesbycomputingthousandsofstatisticallycorrectpseudowellspertrace

• Nolowfrequencymodelrequired• Nolateral/spatialconstraints

• Bestmatchingpseudowellsarese-lectedtoproviderockpropertyvaluesandtheirassociateduncertainties

HIGHQUALITYIMAGESOFRESERVOIRPROPERTYESTIMATESANDASSOCIATEDUNCERTAINTIES

3DviewsofNetFraction,apartoflithofaciesandhigherporosityzonesaftervoxeltransparencyatthetargetreservoirzone

BLUEBACKODISIONEDIMENSIONALSTOCHASTICINVERSIONBLUEBACKODiSIisaOneDimensionalStochasticIn-version method that produces high quality reservoirproperty estimates with associated uncertainties, topredictnetfraction,porosityandlithofaciesdistributioningeologicalplays.

Itisauniqueseismicinversionmethodthatspecificallyincludesonlythemostrobustpriorinformationinordertoapplyadditionalconstraintstothesolution.

BluebackODiSIdoesnotrequireanypriorlateralcon-straints: the algorithm converges so that each tracecanbeinvertedindependentlyofitsneighborsyetlat-erallycontinuityisstillachieved.

The technologywas originally developedbyBP (Con-nolly&Hughes,2013,2014,2016)whileaPetrel*ver-sionhasbeendevelopedjointlybyCegalandBP.

Thesolutionisrobustyetlogicalandcomesfullyinte-gratedintoPetrel,complementingCegal’sQuantitativeInterpretationsolutionBluebackRocksQI.

INPUT

ColorInvertedExtendedElasticImpedance(EEI)

OUTPUT

ODiSIInvertedNetFractionODiSIInvertedLithofacies

01SEISMICDATACONDITIONING

Checkforzerophase,frequency,spectralandampli-tudebalance

Createinterceptandgradientvolumes

02EEIWORKFLOWFindoptimumCHIangles

Normally,fluidandlithologyanglevol-umesarerequired

03IMPEDANCEINVERSIONApplyBayesianInvertseismicdatausingwell-provedColoredInversion

04WELLLOGS

Conditionwelllogdata

Createdrybulkandshearbulkmoduluslogs

Createafacieswelllog

05NOTREQUIRED

Wellsdonotneedtobetied

Waveletsdonotneedtobeextract-ed-frequenciescomefromthecolorinversionoperator

06ODISI

Createparameters

StatisticsQC

InversionQC

Inversion(multi-threadedprocess)

GENERALWORKFLOW

ToperformanBluebackODiSIinversion,theinputdataneedstobequalitycheckedandconditioned.ThenecessarytoolstopreparethedataareavailableintheCegalquantitativeinterpretationsoftwareBluebackRocksQI.

StochasticInversionbymatchingtolargenumbersofpseudowellsworkflows

Wearemorethan340employees,ofwhichmorethan50arehighlyskilledgeoscientists.TheuniquecombinationofgeoscienceandITexpertiseputsusinanexcellentpositionforservingcustomersintheoilandgasindustry.CEGAL.COM

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