Chapter 03 - Data Set

3D Geological Modeling

Chapter 03 – Data Set

Data Set used in the Petrel The Gullfaks data data set has been released released for commercial commercial use by the Noregian oil company Statoil! Gullfaks is one of the ma"or oil #elds in the North Sea and one of the largest oil producing #elds on the Noregian continental shelf$ %ig! 3!& Gullfaks is an oil and gas #eld in the Noregian sector of the North Sea operated by Statoil 'ydro! (t as disco)ered in &*+*$ in block 3,-&0$ at a ater depth of &3. meters /,,!*&3 foot1! The initial reco)erable reser eser)e )e is !& !& bill billio ion n barr barrel els$ s$ an and d th the e remai emaini ning ng reco) eco)er erab able le reser)e in 00, is 3, million barrels! This oil #eld reached peak production in 00& at &20$000 barrels per day!

Fig. 3.1: Gullfaks il %ield

&



Fig3.2: (nfrastructure on the Gullfacks #eld

Development The sea depth in the area is &30 4 0 meters /,5!.0* 4 +&!+2, foot1! The #eld has been de)eloped ith three integrated processing$ drilling and accommodation facilities ith concrete bases and steel topsides$ Gullfaks A$ B and C! Gullfaks B has a simpli#ed processing plant ith only #rst4stage separation! Gullfaks A and C recei)e and process oil and gas from Gullfaks S6r and Gimle! The facilities are also in)ol)ed in production and transport from Tordis$ 7igdis and 7isund! The Tordis production is processed in a separate facility on Gullfaks C! 



Reservoir The Gullfaks reser)oirs consist of Middle 8urassic sandstones of the 9rent Group$ and :oer 8urassic and ;pper Triassic sandstones of the Cook$ Statf"ord and :unde formations! The reser)oirs are &+00 4 000 meters /..++!,+4 5.5&!5+* foot1 belo the sea le)el! The Gullfaks reser)oirs are located in rotated fault blocks in the est and a structural horst in the east$ ith an intermediate highly faulted area!

Fig3.3: Structural setting of the Gulfacks main #eld shoing

3 main areas

3



Fig3.4: :ithostratigraphy of the Gulfacks main #eld

Reover! strateg! ,



The dri)e mechanisms are ater in"ection$ gas in"ection or ater-alternating gas in"ection /<=G1! The dri)e mechanism )aries beteen the drainage areas in the #eld$ but ater in"ection constitutes the main strategy!

Fig3.": Gullfaks o>shore

#ransport il is e?ported from Gullfaks = and Gullfaks C )ia loading buoys to shuttle tankers! The part of the rich gas that is not rein"ected is sent through the e?port pipeline to Stat pipe for further processing at @Arst6 and e?port to the Continent as dry gas!

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Fig3.$: Transportation of Gullfaks

Status Broduction from Gullfaks is in the decline phase! >orts are being made to increase reco)ery$ partly by locating and draining pockets of remaining oil in ater ooded areas$ and partly through continued massi)e ater circulation! (mplementation of a chemical ooding pilot ill be considered in 0&0! = ne pro"ect has also been initiated to e)aluate necessary facility upgrades for lifetime e?tension of the #eld toards 030! Fats a%out &ull'a(s )perations: )peratorE *oationE Disover! !ear: Prodution start:

(n Noray! Statoil 'ydro =S= 3,-&0 in the northern part of the North Sea &*+2 Gullfaks = December &*25 Gullfaks 9 %ebruary &*22

ProdutionE AP+: S.&.: Sulphur: Pour Point: ,-ploration ells: Development ells: *iensees:

Gullfaks C No)ember &*2* il and Gas 3+!.F 0!23+ 0! mass 4&. FC Den norske stats ol"eselskap a!sE . ells Statoil =S=E 5 ells Den norske stats ol"eselskap a!sE &5* ells Statoil =S=E . ells Statoil 'ydro =S=E , ells Betro =S /30!0 1 5


Reovera%le reserves:


Statoil 'ydro =S= /5&!0 1 Statoil 'ydro Betroleum =S /*!0 1 3.+ million Sm3 oil , billion Sm3 gas 3 million tonns ngl Hemaining 0024040&E + million Sm3 oil  billion Sm3 gas 0 million tonns ngl

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#he Supplied Reservoir Data The folloing ells$ along ith their ell headers /ell location map1$ ell de)iations /ell paths1$ ell logs$ and ell tops /formation tops1$ are suppliedE =&0$ =&.$ =&5$ 9&$ 9$ 9,$ 92$ 9*$ C&$ C$ C3$ C,$ C.$ C5$ and C+! The stratigraphic succession of the reser)oir under study is gi)en in the folloing tableE Suession

/ori0on

& /top1

Cretaceous



Tarbert

3

Ness

, /bottom1

tti)e

2

one

Tarbert43 Tarbert4 Tarbert4& Ness4 Ness4&

Chapter 03 - Data Set

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