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2D seismic analysis of Chalk play in the northern Dutch offshore

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Information about 2D seismic analysis of Chalk play in the northern Dutch offshore

Published on May 24, 2016

Author: dickstegers

Source: slideshare.net

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1. 2D Seismic analysis of Chalk play potential in the upper D, E and F-quadrants Dick Stegers, Msc Q2-2016

2. Chalk Economics • Exploration, like any other business, has one major goal: making profit 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00 110.00 120.00 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 $/BBL Oil costs $/BBL Brent Crude Light Crude

3. Chalk Economics • Exploration, like any other business, has one major goal: making profit 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00 110.00 120.00 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 $/BBL Oil costs $/BBL Brent Crude Light Crude

4. Chalk Economics • Exploration, like any other business, has one major goal: making profit 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00 110.00 120.00 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 $/BBL Oil costs $/BBL Brent Crude Light Crude y = 3E-14x6 - 7E-09x5 + 0.0008x4 - 43.077x3 + 1E+06x2 - 2E+10x + 2E+14 R² = 0.9606

5. 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. 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

6. 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

7. Chalk 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

8. 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

9. Chalk Seismic reprocessing: Reprocessed W 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

10. 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

11. Chalk Map Top Chalk EBN 3D AmsterdamPG 2D

12. 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 - Anticline 30 186 Gas shows - Anticline 12 161 Gas shows - Collapsed AC 11 92 Gas shows - Anticline 10 75 Gas shows - Anticline 26 160 N/A - Anticline 15 70 N/A + Anticline 29 56 Dry + Flat AC 22 160 Gas shows + Anticline 34 149 N/A - Anticline 12 38 N/A - Flat AC 13 70 Dry + Anticline 38 121 Dry - Flat AC 22 62 Dry - Flat AC 30 81 Gas - Flat AC 21 111 Oil&Gas shows - Anticline 11 75 Dry + Anticline 18 84 Gas + Anticline 12 55 Dry + Anticline 70 405 Gas shows + Steep collapsed AC 65 57 Gas shows + Flat AC 20 117 Dry ++ Collapsed AC 28 861 Oil shows ++ Steep AC 45 81 Oil shows + Flat AC 63 412 Oil shows ++ Steep AC 29 339 Gas shows + Steep AC 21 221 Gas shows + Steep AC 10 209 Dry + Steep AC 8 32 N/A - Flat AC 9 23 Dry - Flat AC 9 68 N/A - Anticline 6 44 N/A - Anticline 6 81 N/A - Anticline 6 65 Oil shows - Anticline 10 33 Oil&Gas shows - Flat AC 6 15 Dry + Flat AC 5 198 Dry + Steep AC 5 44 Dry + Collapsed AC 0.0 100.0 200.0 300.0 400.0 500.0 600.0 700.0 800.0 900.0 1000.0 0.0 20.0 40.0 60.0 80.0 Column Height(ms) Area (km2) F02-Hanze

13. 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

14. Down to earth Thank you for your attention! D.P.M. Stegers d.stegers@amsterdampg.com www.amsterdampg.com

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