Core to seismic property prediction - 3D rock property prediction using machine learning in the Norwegian

North Sea

FORCE Symposium 2019

Steve Purves*, Arne Klepp Kvalheim, Behzad Alaei, Dimitrios Oikonomou, Eirik Larsen*steve.purves@earthanalytics.no

Acknowledgements

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Petromaks2 Project Partners:The Research Council of

NorwayWintershallDEA

Spirit EnergyLundin

ConocoPhillips

PGS16902VIK PSDM scaled to time

○ Full stack volume (5 - 30 deg)

○ Near angle stack volume (5 - 17 deg)

○ Mid angle stack volume (17 - 27 deg)

○ Far angle stack volume (27 - 33 deg)

○ Ultrafar angle stack volume (33 - 39 deg)

○ PSDM interval velocity volume

○ 7,000 km sq.

○ 55GB per stack

https://www.pgs.com/data-library/europe/nw-europe/north-sea/pgs16902/

Machine Learning + Data at Scale

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Workflow DetailsElastic & Rock Properties

Training Validation

Examples (input|label)0

1

N

Empirical Blind Cross Validation(1) Data cleaning, prep &

conditioning

(2) Well Scale Predictions - Classical ML Models

(3) Seismic Scale - Deep Neural Networks 1D/3D

Seismic showlineCrossline 123865

Seismic showlineCrossline 125225

Seismic showlineInline 34314

Seismic showlineInline 33484

Area overview

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Data from over 400 NCS wells contributes to build property models that generates fully populated label datasets (here: POR, LITH)

Displayed here:Measured core porosity

Core labels from wells

VpVsVp/VsAIDenSatPorPermLitho

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Core Porosity Statistics Lithology Classes

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Predict Core Porosity

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Core Data Points

MD

5000m

0mCPI Data Points

0 0.4 0 0.4

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MD

5000m

0mInferred Porosity

0 0.4 0 0.4

CPI + Core Data Points

104 data points 106 data points

Cores + inferred porosity

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Seismic

Leave-4-out: Group 115/6-6, 15/9-17, 15/9-8, 15/8-1

Leave-4-out: Group 215/6-3, 15/9-19A, 15/9-9, 15/9-24

Leave-4-out: Group 315/6-5, 15/9-19SR, 15/9-18, 15/9-21S

Leave-4-out: Group 415/9-3, 15/9-11, 15/9-7, 15/9-23

Leave-4-out: Group 515/9-1, 15/9-13, 16/7-8S, 15/9-10

Leave-4-out: Group 615/9-12, 15/9-20S, 15/9-14, 15/8-2

Leave-4-out: Group 715/9-6, 15/9-4, 15/9-15, 16/7-4

Leave-4-out: Group 815/9-2, 16/7-5, 15/9-16, 15/9-5

Seismic Blind Training Setup

Excluded: 15/12-18A, 15/12-18S, 15/12-21A, 15/12-23A (deviated wells)and 15/12-21, 15/12-23, 15/12-3, 15/6-3, 15/8-1

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0.6

-1.0

0.0

INLINE

XLIN

E

-1.0 0.0 1.0

-1.0 0.0 1.0

Blind Scores - PHIE

Seismic based Predictions at Blind Well 15/9-2

DEN AI POR LITHVPVS

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PGS16902VIK PSDM: Inline 33484 - Seismic Full Stack

Top_Ty_Heimdal_approx_sat_Reg

Top_Chalk_Reg

BCU-Ling_Reg

TopPorositySleipnerHugin

TopZechstein-Ling

15/6-315/9-7 15/9-5 15/9-2

Seismic

S N

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Predicted Effective Porosity - Inline 33484

Top_Ty_Heimdal_approx_sat_Reg

Top_Chalk_Reg

BCU-Ling_Reg

TopPorositySleipnerHugin

TopZechstein-Ling

15/6-3

15/9-715/9-5

15/9-2

S N

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Predicted Lithology - Inline 33484

Top_Ty_Heimdal_approx_sat_Reg

Top_Chalk_Reg

BCU-Ling_Reg

TopPorositySleipnerHugin

TopZechstein-Ling

15/6-3

15/9-715/9-5

15/9-2

AnhydriteMarlVolcanoclasticCoalLimestoneSandstoneSiltstoneClaystone

S N

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Predicted Acoustic Impedance - Inline 33484

Top_Ty_Heimdal_approx_sat_Reg

Top_Chalk_Reg

BCU-Ling_Reg

TopPorositySleipnerHugin

TopZechstein-Ling

15/6-315/9-7 15/9-5 15/9-2

S N

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Predicted VpVs - Inline 33484

Top_Ty_Heimdal_approx_sat_Reg

Top_Chalk_Reg

BCU-Ling_Reg

TopPorositySleipnerHugin

TopZechstein-Ling

15/6-3

15/9-715/9-5

15/9-2

S N

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Predicted Density - Inline 33484

Top_Ty_Heimdal_approx_sat_Reg

Top_Chalk_Reg

BCU-Ling_Reg

TopPorositySleipnerHugin

TopZechstein-Ling

15/6-3

15/9-715/9-5

15/9-2

S N

Closing Message

● From Core to Seismic

● Reduced cycle time - from months to weeks

● Use all your data

● Utilise predicted properties on a greater scale

● Elevating generalists to specialists

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Thank youQuestions?

The following are additional reference slides only

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Original TGS label: 35 classesClass combination label: 9 classes

Cores + filtered blind predictions

27

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PGS16902VIK PSDM: Crossline 125225 - Full Stack

W E15/6-3

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Predicted Effective Porosity - Crossline 125225

Top_Ty_Heimdal_approx_sat_Reg

Top_Chalk_Reg

BCU-Ling_Reg

15/6-3W E

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Predicted Lithology - Crossline 125225

Top_Ty_Heimdal_approx_sat_Reg

Top_Chalk_Reg

BCU-Ling_Reg

15/6-3W E

AnhydriteMarlVolcanoclasticCoalLimestoneSandstoneSiltstoneClaystone

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Predicted Acoustic Impedance - Crossline 125225

Top_Ty_Heimdal_approx_sat_Reg

Top_Chalk_Reg

BCU-Ling_Reg

15/6-3W E

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Predicted Vp/Vs - Crossline 125225

Top_Ty_Heimdal_approx_sat_Reg

Top_Chalk_Reg

BCU-Ling_Reg

15/6-3W E

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Predicted Density - Crossline 125225

Top_Ty_Heimdal_approx_sat_Reg

Top_Chalk_Reg

BCU-Ling_Reg

15/6-3W E