2D Seismic analysis of Chalk play potential in the upper D, E and F-quadrants Dick Stegers, Msc 23-05-2016 EBN: Dutch Exploration Day
Economics • Exploration, like any other business, has one major goal: making profit Oil costs $/BBL 120.00 Brent Crude 110.00 Light Crude 100.00 90.00 80.00 $/BBL 70.00 60.00 50.00 40.00 30.00 20.00 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 1-1 Chalk
Economics • Exploration, like any other business, has one major goal: making profit Oil costs $/BBL 120.00 Brent Crude 110.00 Light Crude 100.00 90.00 80.00 $/BBL 70.00 60.00 50.00 40.00 30.00 20.00 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 1-1 Chalk
Economics • Exploration, like any other business, has one major goal: making profit Oil costs $/BBL 120.00 Brent Crude 110.00 Light Crude 100.00 90.00 80.00 y = 3E-14x 6 - 7E-09x 5 + 0.0008x 4 - 43.077x 3 + 1E+06x 2 - 2E+10x + 2E+14 $/BBL R² = 0.9606 70.00 60.00 50.00 40.00 30.00 20.00 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 1-1 Chalk
Background Discovery F17-NE 4-12- ’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. F17 EBN study 2013: ‘ Chalk in the northern Dutch offshore is • underexplored ’ Non-exclusive 3D-seismic in DEF-quadrants • shot in 2011/2012 with Fugro Chalk
Study Area F02 Hanze Focus on open acreage • Regional 2D dataset • Eleven different surveys • 80’s, 90’s, 00’s • ~350 lines • Area of ~6.500 km 2 • Chalk
Chalk study Grids & thickness maps Reprocessing seismic data HC analysis well documents Interpreting seismic data Defining and classifying leads Geological study Analysis analogues Re-interpretation Welltops Chalk
Seismic reprocessing: Vintage W E Reprocessed seismic data Improved signal-to-noise ratio • Improved fault recognition • Narrowed steep features • Widened rimsynclines • Improved reflection continuation • Chalk
Seismic reprocessing: Reprocessed W E Reprocessed seismic data Improved signal-to-noise ratio • Improved fault recognition • Narrowed steep features • N Widened rimsynclines • Improved reflection continuation • CK KN ZE SL Chalk
Map Top Chalk Elevation time (ms) -600 -800 F04 F05 E04 E05 E06 -1000 -1200 -1400 -1600 -1800 D09 E07 F07 -2000 -2200 D12 E10 F10 Chalk
Map Top Chalk AmsterdamPG 2D EBN 3D Chalk
Leads • Polygons of leads based on closing contours • 28 structures >10 km 2 ; 9 structures 5-10km 2 1000.0 Area (km 2 ) Height (ms) Nearby well Well result Bright spot Structure 16 123 >10 km N/A - Anticline 900.0 30 186 D12-05-S1 Gas shows - Anticline 12 161 D12-04-S1 Gas shows - Collapsed AC 800.0 11 92 E04-01 Gas shows - Anticline 10 75 E04-01 Gas shows - Anticline Height (ms) 26 160 >10 km N/A - Anticline 700.0 15 70 >10 km N/A + Anticline Column 29 56 F04-01 Dry + Flat AC 22 160 F04-03 Gas shows + Anticline 600.0 34 149 >10 km N/A - Anticline 12 38 >10 km N/A - Flat AC F02-Hanze 13 70 E09-02 Dry + Anticline 500.0 38 121 E09-02 Dry - Flat AC 22 62 E09-03 Dry - Flat AC 400.0 30 81 E11-01 Gas - Flat AC 21 111 E10-03-S2 Oil&Gas shows - Anticline 11 75 E09-02 Dry + Anticline 300.0 18 84 E12-03 Gas + Anticline 12 55 E12-01 Dry + Anticline 70 405 F04-02A Gas shows + Steep collapsed AC 200.0 65 57 F04-03 Gas shows + Flat AC 20 117 F07-01 Dry ++ Collapsed AC 28 861 F11-03 Oil shows ++ Steep AC 100.0 45 81 F08-02 Oil shows + Flat AC 63 412 F11-03 Oil shows ++ Steep AC 0.0 29 339 F10-03 Gas shows + Steep AC 21 221 F10-03 Gas shows + Steep AC 0.0 20.0 40.0 60.0 80.0 10 209 F11-02 Dry + Steep AC 8 32 >10 km N/A - Flat AC 9 23 E06-01 Dry - Flat AC Area (km 2 ) 9 68 >10 km N/A - Anticline 6 44 >10 km N/A - Anticline 6 81 >10 km N/A - Anticline 6 65 E10-01 Oil shows - Anticline 10 33 E10-02 Oil&Gas shows - Flat AC Chalk 6 15 F04-01 Dry + Flat AC 5 198 F05-02 Dry + Steep AC 5 44 F07-01 Dry + Collapsed AC
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
Thank you D.P.M. Stegers for your attention! d.stegers@amsterdampg.com www.amsterdampg.com Down to earth
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