DHI enhancement as key-enabler to portfolio rejuvenation - sneep - nam part ii.pdf · DHI...
Transcript of DHI enhancement as key-enabler to portfolio rejuvenation - sneep - nam part ii.pdf · DHI...
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