The Britannia Field, located 210 kmn ortheast ofA berdeen,i st he largest LowerCretaceous condensategasaccumulation inthe NorthSea.The fieldspans four UK blocks(250km 2 )andisacombination structural/stratigraphic trap. Assessingthe remaininguncertaintyinafieldthe sizeofBritannia iscrucialtofuture development planningscenarios. Afterfiveyears offieldlife, ithasproved vitaltotake the 'reservoirpulse'and to evaluatethe keyreservoirparameters thatimpactthe futuredevelopment ofthe field.The Britannia reservoirconsists ofd eep-waterm ass-flow sandstones,rangingf rom high density 'clean' turbiditestonon-reservoirfaciesconsistingof'mixed-slurry' anddebrisflows. Post-depositionalremobilization andslumpingh avemodified the originaldepositionalfabric;however,awealthofc ored ata(over2 0000 ft), alongwith63 logged wells anddynamic production data, haveallowed refiningofthe flow unitdefinition within the reservoir. Arigorous re-correlation studybased on the integration ofbiostratigraphy,chemostratigraphyand pressuredatahasdefined anoverall sheet-like reservoirarchitecture, withsomeunits exhibitingamorecomplex channel-like geometry (Zones30/40).The Britannia reservoirteamhascapitalized on recent advancesinreservoirmodellingtechnology,includinga morerigorous approach to uncertainty analysisinboththe static anddynamic realm. The results from adynamic uncertainty studyhaveprovided keyinformation on the range andmagnitude ofkeypetrophysicalparameters and theirimpacto nr eservoirp erformance andultimaterecovery. Weighingthe impacto fadeterministic versus stochastic approach hasalso beenac riticalfactor int he faciesdistribution. The major uncertaintiesint he dynamic reservoirmodelthatimpactr eservesandrecovery factor are(1) originalgasinp lace, (2) fault and/or stratigraphic transmissibility 'baffles',(3) effectivepermeability,a nd, (4)condensateb anking.Int he static geologicalmodel,Jacta-aGocad uncertainty module-hasled to over300 realizations ofthe full fieldmodel. In the dynamic realm,e xperimentaldesignw asu sed to monitor reservoirp erformance bycapturingthe variables havinglargest impacto ndynamic flow behaviour andgasrecovery.DVD: CoredisplayE4 isrelevant to thischapterandcanbe viewed on the accompanyingDVD.Thiss tudyaddressesthe remaininguncertainty inBritannia Field afterfiveyears ofproduction history,a ndthe useofuncertainty modellingtools inboththe static andd ynamic realms,to address betterr eservoirp rediction inac omplext urbiditereservoir. This paperisanupdateof, andcomplement to,the previously published Britannia reservoirm odellingstudy( Jones etal .1 999) which relied solely on the static pre-production well information. The integration offiveyears ofproduction history hasallowed testing ofthe keyr eservoirp arameters int he dynamic simulation model so thatu ncertainty rangescanbe estimated andthesesame parameters canbe defined moreaccurately inthe static geological model.The Early Cretaceous Britannia reservoirhasbeenthe subjectof numerous publications. The most significant isathematic seto n the LowerCretaceous ...
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