Prospectivity G and M blocks
Analysing the Upper Jurassic play
G&M exploration study
•
Goal: De-risk underexplored plays and identify new leads•
New insight and exploration opportunities will be provided to the industry•
Area selected on the presence of sizeable open acreage and underexploited infrastructureTerschelling Basin fault zone Ameland Block
minor
Chalk play
structural trap Salt plugging Triassic, Jurassic and Cretaceous four-way dip trap
Chalk structural trap
Basal Rotliegend structural- stratigraphic trap Carboniferous fault-dip trap
W E
Rifgronden fault zone
Schill Grund High Terschelling Basin
N Lower Triassic sst S
unconformity trap Zechstein
Caprock
structural trap
Upper Triassic
fat sand play Lower Triassic sst
truncation trap
Carboniferous fault-dip trap Carboniferous fault-dip trap
B
B’
A A’
Lower Cretaceous Upper Cretaceous North Sea Group
Upper Triassic Lower Triassic Upper Jurassic
Upper Permian Lower Permian
Upper Carboniferous Sandstone
Migration path Unconformity
Oil and Gas shows
Gas show in Jurassic Oil show in Jurassic
Gas show outside Jurassic GM area
Thickness Schieland Group (m) 0-100
100-350 350-700 700-1200 1200-1500 1500-2100
>2100
0 10 20 km
Fields
Gas Jurassic Oil Jurassic Gas
Oil
Schill Grund High
Terschelling Basin
Ameland Block
Well analysis Upper Jurassic Invalid test
Valid negative test Valid positive test GM area
Thickness Schieland Group (m) 0-100
100-350 350-700 700-1200 1200-1500 1500-2100
>2100
0 10 20 km
Fields
Gas Jurassic Oil Jurassic Gas
Oil
Hydrocarbon shows
Potential plays in the G&M Area
Well analysis
Featured: The Upper Jurassic play
The Upper Jurassic play (and Lower Cretaceous) is
proven in the G&M area by eight wells. Ongoing studies should aid to identify the prospective areas.
•
Reservoir: Upper Jurassic sandy intervals are present throughout the study area (mainly Terschelling Basin) but reservoir quality can vary significantly laterally and is poorly understood.•
Seal: Top seal is widely present as Vlieland Shale or intra Jurassic/Lower Cretaceous shales. Stratigraphic trapping potential has not been evaluated yet.•
Source and charge: Carboniferous is the most likelysource. Hydrocarbon shows are recorded in the area in several intervals, of which eight shows were identified in the Jurassic. Charge is envisaged along deep faults where thickness of the Zechstein is limited.
Figures: Preliminary interpretations of hydrocarbon shows and analysis of the Upper Jurassic/Lower Cretaceous wells Upper Jurassic Fields in G&M
Field Reservoir Seal
F15-B Scruff Spiculite Mb Clay deep Mb
L06-A Terschelling sandstone Mb Vlieland Claystone Fm
G16-A Scruff Group Schill Grund Mb
M07-B Terschelling Sandstone Vlieland Claystone
19771978 19791980 19811982
EAGE 2015
19992000 2001 20022003 20042005 20052006 20072008 2009 2010 2011
0 1 2 3 4 5
1969 1976 1983 1990 1997 2004 2011
# wells drilled
Year Explora:on history – Target of explora:on wells
Ter:ary Upper Cretaceous Lower Cretaceous Triassic
Jurassic Permian Zechstein Permian Rotliegend Carboniferous
A
B
A’
B’
Exploration density
Valid postive test: 5
Valid negative test: 16 Invalid test:
updip
potential: 16
Total number of wells analysed: 37 Well analysis Upper Jurassic G&M area
