DHI enhancement as key-enabler to portfolio rejuvenation

Part II - Examples from the Southern North Sea

R. Sneep, Matthias Brühl, Naima Yilo, Rutger van Spaendonck, Ruud van Boom, Wicher van Lingen

Presentation outline

Sense of urgency

Looking through a different lense

DHI scoring as enabler

A A

Depth

…with downdip potential?

Prospect A…

GW C?

GW C equa ls K07 f ie ld , vo lum es no t su ff ici en t for developm ent

Deep GWC: 5x la rger v olumes

tROK07 Field

Base Seal map

Case studies and challenges

Looking back and forward

Sense of urgency

Historical Production

NFI

Projects

Economiccut off

A need for structural volume addition

Looking through a different lense

Regional portfolio

evaluation versus local

incremental studies

Regional portfolio

analysis opens up new

maturation potential

DHI scoring as integrated enabler

Log information Fluid correction Wedge model

CTD stack Blind CTD stack scoring

N/G increaseN/G increase

Match geologyMatch geology

Case: calibration to an existing field

GWC

Calibration on existing and well known

fields forms the basis for DHI scoring

Case: regional CTD scoring of fields

Correct (15)

Incorrect (9)

No pick (5)

No GWC info (2)

In selected case study 63% of CTD stack

interpretations matched measured HC contact. Of the

‘Incorrect’ cases, half was influenced by residual gas.

Case: CTD stack identifying deeper contact

A A

Depth

…with downdip potential?

Prospect A…

GW C?

GW C equa ls bor dering field, vo lum es no t su ff icien t for stand-a lone development

Deep GWC (cor responding to

sp il l -po in t): 5x la rger volumes, ver y attr active

oppor tunity

tROBordering field

Base Seal map

CTD stacking has identified

significant upside in the exploration

portfolio.

Case: regional CTD scoring of prospects

GWC, conf > 40 (18)

GWC, conf < 40 (20)

Dry, conf > 40 (18)

No pick (15)

Undecided (3)

In selected case study 49% of CTD stack

interpretations received a confidence level >40,

significantly influencing maturation decisions.

Challenges along the way

Residual gas

Seismic data quality

Structural complexity (e.g. faults)

Reservoir quality

Thin layers

Case: residual gas

Well B

Well A

GWC A

FWL B

Residual gas

Residual gas complicates the

DHI

scoring exercise, often resulting

in

Data Model

A new horizon

Historical Production

NFI

Projects

Economiccut off

31 new projects identified,

of which 34% of decisions influenced by DHI de-risking

Looking forward

Applications in new regional studies

L2L9 Saturn

Need to facilitate fit-for-purpose assurance

Trials on other plays than Rotliegend

Acknowledgements

� Matthias Brühl

� Rutger van Spaendonck

� Wicher van Lingen

� Ruud van Boom

� Naima Yilo

� Oscar Kelder

� Partners of NAM