reservoir potential of the upper jurassic€¦ · upper jurassic shallow marine sandstones in the...

Crossborder study area

Reservoir potential of the Upper JurassicUpper Jurassic shallow marine sandstones in the northern Dutch offshore

For questions contact exploration@ebn.nl

• 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 (friso.veenstra@tno.nl).

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)