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2D Seismic analysis of Chalk play potential in the upper D, E and F-quadrants
Dick Stegers, Msc
Q2-2016
Chalk
Economics• Exploration, like any other business, has one
major goal: making profit
1/10 31/12 1/4 2/7 1/10 31/12 2/4 2/7 2/10 1/1 1/4 2/7 1/10 1/120.00
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Oil costs $/BBL
Brent Crude
Light Crude
$/BB
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Chalk
Economics• Exploration, like any other business, has one
major goal: making profit
1/10 31/12 1/4 2/7 1/10 31/12 2/4 2/7 2/10 1/1 1/4 2/7 1/10 1/120.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
110.00
120.00
Oil costs $/BBL
Brent Crude
Light Crude
$/BB
L
Chalk
Economics• Exploration, like any other business, has one
major goal: making profit
1/10 31/12 1/4 2/7 1/10 31/12 2/4 2/7 2/10 1/1 1/4 2/7 1/10 1/120.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
110.00
120.00
Oil costs $/BBL
Brent Crude
Light Crude
$/BB
L
y = 3E-14x6 - 7E-09x5 + 0.0008x4 - 43.077x3 + 1E+06x2 - 2E+10x + 2E+14R² = 0.9606
Chalk
BackgroundDiscovery F17-NE4-12-’12: Wintershall announces an oil discovery in exploration licence F17a in the Dutch North Sea. Exploration well F17-10 found a Late Cretaceous Chalk reservoir of good quality containing crude oil. Preliminary resource estimates indicate a potential of at least 30 million barrels recoverable oil with a more than significant upside.
EBN study 2013:• ‘Chalk in the northern Dutch offshore is
underexplored’
• Non-exclusive 3D-seismic in DEF-quadrants shot in 2011/2012 with Fugro
F17
Chalk
Study Area
• Focus on open acreage
• Regional 2D dataset
• Eleven different surveys• 80’s, 90’s, 00’s• ~350 lines
• Area of ~6.500 km2
F02 Hanze
Chalk
Chalk study
Chalk study
Reprocessing seismic data
Defining and classifying leads
Re-interpretation Welltops
Geological study
Interpreting seismic data
Grids & thickness maps
Analysis analogues
HC analysis well documents
Chalk
Seismic reprocessing: VintageW E
Reprocessed seismic data
• Improved signal-to-noise ratio
• Improved fault recognition
• Narrowed steep features
• Widened rimsynclines
• Improved reflection continuation
Chalk
Seismic reprocessing: ReprocessedW E
CK
SL
ZE KN
N
Reprocessed seismic data
• Improved signal-to-noise ratio
• Improved fault recognition
• Narrowed steep features
• Widened rimsynclines
• Improved reflection continuation
Chalk
Map Top Chalk
E04 E05 E06 F04 F05
E07
E10
D09
D12
-600-800-1000-1200-1400-1600-1800-2000-2200
Elevation time (ms)
F07
F10
Chalk
Map Top Chalk
EBN 3D
AmsterdamPG 2D
Chalk
Leads• Polygons of leads based on closing contours• 28 structures >10 km2 ; 9 structures 5-10km2
Area (km2) Height (ms) Nearby Well result Bright spot Structure 16 123 N/A - Anticline30 186 Gas shows - Anticline12 161 Gas shows - Collapsed AC11 92 Gas shows - Anticline10 75 Gas shows - Anticline26 160 N/A - Anticline15 70 N/A + Anticline29 56 Dry + Flat AC22 160 Gas shows + Anticline34 149 N/A - Anticline12 38 N/A - Flat AC13 70 Dry + Anticline38 121 Dry - Flat AC22 62 Dry - Flat AC30 81 Gas - Flat AC21 111 Oil&Gas shows - Anticline11 75 Dry + Anticline18 84 Gas + Anticline12 55 Dry + Anticline70 405 Gas shows + Steep collapsed AC65 57 Gas shows + Flat AC20 117 Dry ++ Collapsed AC28 861 Oil shows ++ Steep AC45 81 Oil shows + Flat AC63 412 Oil shows ++ Steep AC29 339 Gas shows + Steep AC21 221 Gas shows + Steep AC10 209 Dry + Steep AC8 32 N/A - Flat AC9 23 Dry - Flat AC9 68 N/A - Anticline6 44 N/A - Anticline6 81 N/A - Anticline6 65 Oil shows - Anticline
10 33 Oil&Gas shows - Flat AC6 15 Dry + Flat AC5 198 Dry + Steep AC5 44 Dry + Collapsed AC
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F02-Hanze
Undrilled!
Conclusions• Still high untapped potential in northern Dutch offshore• Reprocessed 2D-seismic data significantly improves quality• Regional analysis with 2D seismic gives an excellent indication of HC-
potential different structures• Deliverables project: Geological report, 2D-seismic dataset and Petrel-project:
Interpreted re-processed seismic dataset All wells incl. LAS-files and TD-tables Well top re-interpretation Well log analysis Polygon set of leads Maps of reservoir & seal Regional maps by TNO
Chalk
