Wisting shallow reservoir - Force · Wisting – shallow reservoir ... very good reservoir properties in places; heterogenity Cap Rock: ... Source rocks and oil quality

OMV (Norge) AS

Wisting – shallow reservoir Possibilites and challenges

FORCE Underexplored Plays II

Eirik Stueland

Stavanger, Nov 23, 2016

From left Amundsen, Hanssen, Hassel and Wisting. Amundsen's expedition at the South Pole, December 1911 (Photo by Olav Bjaaland.)

2 | OMV (Norge) AS, Eirik Stueland, Nov 23, 2016

Wisting Discovery

Location and main setting

Wisting Development – challenges and opportunities

Imaging

Seismic, EM

Reservoir

Exploration vs Production scale

Source rocks and oil quality

Drilling & completion

Wisting Central II well; game changer on the platform areas

Development concept

Agenda


General information

Blocks 7324/7 & 8

Area 429km2

Awarded May 2009, 20th Round

Partnership

OMV (Norge) AS (operator) 25%

Idemitsu Petroleum Norge AS 20%

Petoro AS 20%

Tullow Oil Norway AS 20%

Statoil Petroleum AS 15%

PL 537 Wisting License Summary

OMV (Norge) AS License Barents Sea


Barents Sea Structural Elements

Wisting: Hoop Fault Complex on the

Bjarmeland Platform

Maud Basin

Svalis Dome

Main plays in the Hoop Area:

Jurassic Realgrunnen Subgroup

Upper Triassic (Carnian, Norian)

Snadd Fm

Middle Triassic / Anisian Kobbe Fm

Cretaceous


Barents Sea Structural Elements

Main risks in the Hoop and Bjarmeland Platform

Containment (shallow seal, fault-reactivation, cap-rock integrity)

Reservoir thickness (Jurassic/Realgrunnen)

Sourcing/phase

Reservoir presence & quality (Triassic; Snadd & Kobbe Fm)

TWT Map BCU

West East

N


PL 537 Wisting Overview

Very shallow reservoir – and heavily

compartmentalized

Clearly defined structures with strong fluid

driven amplitudes

5 exploration and appraisal wells drilled

in the license:

3 oil discoveries in Jurassic

1 dry in Jurassic (7324/8-2 Bjaaland)

1 dry in Triassic (7324/7-1S)

Main reservoir: Upper Triassic to Middle


Hanssen

WC South

WC

WC West

Bjaaland

Hassel

Structure Depth Map


PL 537 Wisting Overview Seismic RMS Amplitude Map

Hanssen

WC South

WC

WC West

Bjaaland

Hassel

Very shallow reservoir – and heavily

compartmentalized

Clearly defined structures with strong fluid

driven amplitudes

5 exploration and appraisal wells drilled

in the license:

3 oil discoveries in Jurassic

1 dry in Jurassic (7324/8-2 Bjaaland)

1 dry in Triassic (7324/7-1S)

Main reservoir: Upper Triassic to Middle



PL 537 Wisting Overview

©

From Cenozoic into Lower

Cretaceous -> uplift and erosion

If hydrocarbon leaks; straight to

surface, no thief/buffer zones

1 shot only – no room for failure !


Seismic section through the Wisting wells

- +

IMPEDANCE ZERO-PHASE

WAVELET

POLARITY CONVENTION

TW

T

Top Fuglen

Top Realgrunnen

Base Reservoir

Top Snadd

Bjaaland Central Alternative Hanssen Seismic amplitude map

CSEM amplitude map

Hanssen

WC South

WC

WC West

Bjaaland

Hassel

Hanssen

WC South

WC

WC East

Bjaaland

Hassel

Courtesy of EMGS

600

800

1000


Stratigraphy in the Hoop Area

From Norian to Pliensbachian/Toarcian – missing millions of year…!

Stø

Fruholmen

Nordmela

Tubåen

Secondary play : Snadd Fm

Main play: Realgrunnen Sg.

Source Rock: Steinkobbe Fm

Source Rock: Hekkingen Fm

Stø Fm: Shallow marine deposits, lateral and vertical homogenous

Fruholmen Fm: Fluvial dominated; channel sands with very good reservoir properties in places; heterogenity

Cap Rock: Fuglen Fm

?


Wisting Discovery



Imaging

Seismic, EM

Reservoir





Development concept

Agenda


Reservoir Imaging

Wisting data acquired to image deeper targets

Limited offset range gives challenging well calibration and lack of AVO distribution

Shallow reservoir – 250m below seabed

Reservoir situated above first water-bottom multiple

High frequency content, high resolution

CSEM data are used to de-risk fluid content

Exploration, and now also in development

P-Cable 3D seismic acquired in 2016

High resolution seismic for shallow reservoirs

Processing ongoing

Courtesy of EMGS

RMS amplitude around Top Realgrunnen CSEM response, Realgrunnen 1500m 1500m

Central II Central II

Central Central


Reservoir Imaging

CSEM response around Stø

Hassel

Hanssen

Central

Bjaaland

Courtesy EMGS

RMS amplitude around Stø

Hassel

Hanssen

Central

Wisting data acquired to image deeper targets

Limited offset range gives challenging well calibration and lack of AVO distribution

Shallow reservoir – 250m below seabed

Reservoir situated above first water-bottom multiple

High frequency content, high resolution

CSEM data are used to de-risk fluid content

Exploration, and now also in development

P-Cable 3D seismic acquired in 2016

High resolution seismic for shallow reservoirs

Processing ongoing

Hanssen

Seismic line through the 7324/8-1 well: How much details can we get out from the seismic and link it to the geology ? Resolution game..!

3D Geokinetic Survey

©


Wisting Discovery



Imaging

Seismic, EM

Reservoir





Development concept

Agenda


Well Correlation Realgrunnen Subgroup - Regional

Flooding event; start of the

Realgrunnen Subgroup – clear

marker all over, both in wells

and on seismic

Main flooding event in

Bathonian; Fuglen Fm – seen in

all wells and on seismic

Hammerfest Basin and

Skrugard Area; depocentres at

the time – reference cases for

the Realgrunnen Subgroup

Rest of the Barents Sea;

condensed, with missing

sections


Bathonian flooding / MFS (Fuglen Fm)

Marine conditions in Stø Fm

Fluvial conditions in Reke Mb (Middle Fruholmen Fm)

Nordmela (Pliensbacian) –Fruholmen boundary, hiatus of at least 18 mill years

Hanssen & Alternative wells; shale underneath Stø Fm; Krabbe Mb of Fruholmen? How extensive – important for the development/drainage

Same seen in outcrops on Svalbard; Norian to Pliensbachian – excellent analogue; can walk the unconformity…!

Well correlation Realgrunnen Subgroup - Wisting Area Flattened on Top Stø Fm

Regional flooding event


Good reservoir sands

Non-reservoir

Poorer reservoir

©


Well correlation Realgrunnen Subgroup - Wisting Area Flattened on Top Stø Fm



Good reservoir sands

Non-reservoir

Poorer reservoir

Stø Fm: homogenous, excellent reservoir quality

Fruholmen Fm: heterolithic, inplace excellent reservoir quality, facies dependent

© ©


Wisting Discovery



Imaging

Seismic, EM

Reservoir





Development concept

Agenda


Triassic source proven, possibility with blending of Jurassic

Anisian Steinkobbe important source level in the area (Botneheia Fm on Svalbard, shallow well on Svalis Dome)

Oil samples: API of ~ 36

Wisting Central GOR is 50

Sm3/Sm3

Slightly biodegradation

Regarded as major risk pre-drill

Minor differences between the

segments

Wisting Oil discovery Where is the oil coming from?


Wisting Area / Hoop Fault Complex

Source and migration

General Hekkingen Fm (Kimmeridge clay) modelling; not mature on the platform areas

Important to prove the Triassic source – influence the whole area for exploration – Hekkingen Fm (Kimmeridge clay) not mature on the platform areas

Anisian/Kobbe modelling; mature on the platform areas – facies is the key


Wisting Discovery



Imaging

Seismic, EM

Reservoir





Development concept

Agenda


Is it possible to drill and test?

Can we achieve desired well placement?

Is there oil in the 2 segments (CS & CW)?

Wisting Central II – horizontal Appraisal Well

Pre-drill Model

Central

South

Hanssen

Central

West

Central

East

©


Is it possible to drill and test?

Can we achieve desired well placement?

Is there oil in the 2 segments (CS & CW)?

Wisting Central II – horizontal Appraisal Well

Post-drill Model

Central

South

Hanssen

Central

West

Central

East

Thicker sandstone

Stø, Nordmela (?)

Deeper contact, and difference between segments

©


Oil encountered in

2 segments

Horisontal section

achieved (~1700m)

Successful DST

Drilling through 3 major faults

Successful geosteering within the zone of

interest

Geosphere in the 8 ½ ‘ section

Periscope in the 6’ section

Conditions ideal for geosteering with deep

reading resistivity tools

Wisting Central II – main achievements Key for the development concept

Central

South

Hanssen

Central

West

Central

East


Oil encountered in

2 segments

Horisontal section

achieved (~1700m)

Successful DST

Drilling through 3 major faults

Successful geosteering within the zone of

interest

Geosphere in the 8 ½ ‘ section

Periscope in the 6’ section

Conditions ideal for geosteering with deep

reading resistivity tools

Wisting Central II – main achievements Key for the development concept

Central

South

Hanssen

Central

West

Central

East


Wisting Discovery



Imaging

Seismic, EM

Reservoir





Development concept

Agenda


Possible Development Concept

Drainage strategy:

Long horizontal oil producers

Now proven by the Wisting Central II

Vertical/slanted water injectors (maintain pressure)

Main risk: containment/cap rock integrity

Oil in Place

(mnboe) low high

Total 800 1250

Rec. Resources (mnboe) low high

Total 200 500


Acknowledgements

Thanks to OMV (Norge) AS and PL537 License Partners

(Statoil, Petoro, Tullow and Idemitsu) for permission to share

this information.

Thanks to the OMV Barents Sea Exploration team.

Thanks to OMV Wisting Production & Development.

Thanks to the OMV Drilling Department.

Thanks to EMGS for permission to show their licensed MC

data.

Wisting shallow reservoir - Force · Wisting – shallow reservoir ... very good reservoir properties in places; heterogenity Cap Rock: ... Source rocks and oil quality

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