reservoir potential of the upper jurassic€¦ · upper jurassic shallow marine sandstones in the...
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Crossborder study area
Reservoir potential of the Upper JurassicUpper Jurassic shallow marine sandstones in the northern Dutch offshore
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• ThreefieldswithUpperJurassicshallowmarinesand-stonereservoirs,30kmfromDutchborder:Fife&Fer-gus(UK),A6-A(DE)(Fig.1).
• KimmeridgiantoVolgian(LateJurassic)shallowmarinesandstonesthatformthereservoiroftheUKFifefieldareunderexploredintheNetherlands.
• Fife-equivalentsandstonesarelikelytobepresentalongtheedgesoftheCentralGraben.IntheNether-landsthesearepartoftheNoordvaarderMember.
• Sandstonesfromthisintervalwithfavourablereser-voircharacteristicshavebeenencounteredinatleasttwoDutchwells(figs.1-4).
• ApetrophysicalanalysisoftheintervalinDutchwellB13-02showsaN/Gof0.93andanaverageporosityof21%(Fig.3).
• Coreplugmeasurementsshowpermeabilitiesofupto150mD(Fig.4).
5°E4°E3°E57°N
56°N
55°N
0 80
Kilometers
Norway
Denmark
Germany
The NetherlandsED 1950 UTM Zone 31N
B13-02& B14-02
Saxo-1&Wessel-1Fife field&
Fergus field
Paleogeography Kimmeridgian(Doornenbal et al., 2010)
HighsMarine mudParalic (fluvial to marginalmarine)Shoreface sandsWells with U. Jurassic sands
UnitedKingdom
CC ee nn tt rr aa llGG rr aa bb ee nn
CC ee nn tt rr aa llGG
r raabbeenn
A6-A field
More work will be
done to establish
reservoir presence
Fig. 1: Occurrence of shallow marine Kimmeridgian-Volgian sandstone reservoirs in the five
country area. Dutch wells B13-02 and B14-02 show that these sands are present as far east
as the B quad. Paleogeographic reconstructions of their extent vary significantly; compare the
figure to the left to the one below.
Fig. 3: Petrophysical analysis of the Noord-
vaarder Member interval in NL well B13-02.
Fig. 2: A) Shallow
marine sandstones
(Noordvaarder Mb)
in well B13-02. B)
section flattened at
base Chalk.
Fig. 4: Core plug measurements
from the Noordvaarder Member in
NL well B13-02.
A new play type in the G&M quadrants The MAXIM project – new potential plays in
the Upper Jurassic of the Dutch Central Graben
WithintheDutchgovernmentfundedUpstreamGasresearchpro-gramme(TKI),theJurassicresearchprojectMAXIMisscheduledtostartinearly2017.ThisresearchwillbeconductedbytheBasinAnalysisTeamoftheNetherlandsOrganisationforAppliedScientif-icResearch(TNO),inclosecollaborationwithEBNandseveraloth-erindustrypartners.TheMAXIMProjectaimsatdefiningnewpotentialplaysintheUp-perJurassicalongtheDutchCentralGrabenbasinmarginsandba-sinaxis.TheprojectwillleveragefromyearsofexperienceintheDutchsubsurface,combinedwithanimpressivedatasetthatin-cludesmorethan100wells,almostfull3Dseismiccoverageandawealthofpreviousbasin,biostratigraphicandsedimentologicalstudies.Theappliedmulti-disciplinaryapproachwillincludepalyno-logicalandstableisotopeanalyses,3Dseismicmapping,amplitudemapping,2Dstructuralrestorationsandmore(Fig.5).
More information?TNOandTKIwelcomeindustrypartnerstojointheprojecteitheraspayingorin-kindcontributor.Ifyouareyouinterestedtoknowmoreaboutthisproject,pleasecontactFrisoVeenstra ([email protected]).
Fig. 5: Seismic cross-section through the Dutch Central Graben basin margin. Seismic mapping and amplitude mapping will be conducted in close harmony with biostratigraphical and stable isotope analyses.
Duetoerosionanddissolutionofsubcroppingevap-oritesofTriassicageattheMidCimmerianunconfor-mityapotentialnewplaytypeforoffshoretheNeth-erlandshasbeenidentified.ThegulliesthatoriginatedattheerodedRötsurfacesarefilledwithUpperJuras-sictoLowerCretaceoussediments.Anexampleisthe“DeWijk”field,locatedonshorethatproducesfromtheVlielandsandstonethatdepositedinadepressionformedduetoerosionanddissolutionofUpperTriassicevaporites.Mainuncertaintyoftheplayisthenature(sandorshale)oftheinfillsediments.TheVlielandSand-
stonemayhavenotbeendepositedthisfarNorth,how-everothersandsourcescanbetheLowerTriassicsandsthatarelikelyerodedatthesametimeastheformationoftheaccommodationspace(figure6aand6b).Wearecurrentlyworkingonacross-borderarticlewiththeBGR(FederalInstituteforGeoscienceandNaturalResourcesGermany),sincetheGulliesextendintoGermany.ThearticleisexpectedtobepublishednextyearintheSpe-cialpublicationonMesozoicResourcePotentialintheSouthernPermianBasinbytheGeologicalSocietyofLondon.
5°E4°E3°E57°N
56°N
55°N
0 80
Kilometers
Norway
Denmark
Germany
The NetherlandsED 1950 UTM Zone 31N
B13-02& B14-02
Saxo-1&Wessel-1Fife field&
Fergus field
Paleogeography LateKimmeridgian/ Early Volgian(Millennium Atlas)
EmergentFluvio-deltaicShoreface sandsDistal shelfSlopeDeep-water mass-flow sandsDeep basinRiversWells with U. Jurassic sands
UnitedKingdom
CC ee nn tt rr aa llGG rr aa bb ee nn
CC ee nn tt rr aa llGG
r raabbeenn
A6-A field
More work will be
done to establish
reservoir presence
Fig. 8: Crossection as indicated in fig. 7. Gullies are visible and located where Röt Evaporites are eroded or dissoluted.
Fig. 7: Thickness map of the Lower Cretaceous Schieland group
(between light and dark green interpretations on figure 8). Where
gullies are present the Lower Cretaceous is showing thick elongated
features.
Figures 6a, b above illustrate the
hypothesis on the infill. Due to
halotectonics the Lower Triassic sands
and Upper Triassic clays and evaporites
are uplifted and eroded, at the same
time gullies are formed and possibly
filled with erosion material during the
Jurassic. The other hypothesis is that
the gullies are filled with clay deposited
during the Lower Cretaceous.
North Sea Group
Upper Cretaceous
Permian Zechstein
Upper TriassicLower Triassic
Lower Cretaceous
4500 m
25000 m
TWT(ms)