Post on 20-Aug-2020
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
2
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
4
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
6
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
7
Core Porosity Statistics Lithology Classes
8
Predict Core Porosity
9
Core Data Points
MD
5000m
0mCPI Data Points
0 0.4 0 0.4
10
MD
5000m
0mInferred Porosity
0 0.4 0 0.4
CPI + Core Data Points
104 data points 106 data points
Cores + inferred porosity
11
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
14
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
16
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
17
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
18
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
19
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
20
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
21
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
22
23
Thank youQuestions?
The following are additional reference slides only
25
Original TGS label: 35 classesClass combination label: 9 classes
Cores + filtered blind predictions
27
28
PGS16902VIK PSDM: Crossline 125225 - Full Stack
W E15/6-3
29
Predicted Effective Porosity - Crossline 125225
Top_Ty_Heimdal_approx_sat_Reg
Top_Chalk_Reg
BCU-Ling_Reg
15/6-3W E
30
Predicted Lithology - Crossline 125225
Top_Ty_Heimdal_approx_sat_Reg
Top_Chalk_Reg
BCU-Ling_Reg
15/6-3W E
AnhydriteMarlVolcanoclasticCoalLimestoneSandstoneSiltstoneClaystone
31
Predicted Acoustic Impedance - Crossline 125225
Top_Ty_Heimdal_approx_sat_Reg
Top_Chalk_Reg
BCU-Ling_Reg
15/6-3W E
32
Predicted Vp/Vs - Crossline 125225
Top_Ty_Heimdal_approx_sat_Reg
Top_Chalk_Reg
BCU-Ling_Reg
15/6-3W E
33
Predicted Density - Crossline 125225
Top_Ty_Heimdal_approx_sat_Reg
Top_Chalk_Reg
BCU-Ling_Reg
15/6-3W E