3D Seismic Investigations at the Millennium Uranium Deposit, Athabasca Basin, SK, Canada
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1 3D Seismic Investigations at the Millennium Uranium Deposit, Athabasca Basin, SK, Canada Clare O Dowd* and Garnet Wood Cameco Corporation Saskatchewan Geological Survey Open House, December 1, 2009
2 Outline Location Map Historical understanding of the Millennium area deposit model (pre 2006) forward modelling Surface 3D Seismic Survey source tests survey design resultant fold comparison with McArthur River (EXTECH IV) Additional seismic surveys borehole VSP/ MSP and Side-scan Data examples slices of 3D block, slices of 3D block with VSP block, unconformity map, structural update Updated 3D model (before & after) Conclusions Acknowledgments Saskatchewan Geological Survey Open House, December 1,
3 Location Map Millennium Saskatchewan Geological Survey Open House, December 1,
4 Outline Location Map Historical understanding of the Millennium area deposit model (pre 2006) forward modelling Surface 3D Seismic Survey source tests survey design resultant fold comparison with McArthur River (EXTECH IV) Additional seismic surveys borehole VSP/ MSP and Side-scan Data examples slices of 3D block, slices of 3D block with VSP block, unconformity map, structural update Updated 3D model (before & after) Conclusions Acknowledgments Saskatchewan Geological Survey Open House, December 1,
5 Millennium 3D model With No Seismic Input Millennium Deposit Slush Lake (meters) Saskatchewan Geological Survey Open House, December 1,
6 Millennium 3D model With No Seismic Input Mother Marker B1 (meters) Saskatchewan Geological Survey Open House, December 1,
7 Millennium 3D model With No Seismic Input Marker Mother B (meters) W E Saskatchewan Geological Survey Open House, December 1,
8 Millennium 3D model With No Seismic Input MFd MFc MFb MFa UC (meters) W E Saskatchewan Geological Survey Open House, December 1,
9 Millennium 3D model With No Seismic Input W E (meters) Saskatchewan Geological Survey Open House, December 1,
10 Technical Challenges/Obstacles Need to Record High Frequencies Limited drill hole information; alteration; variable glacial overburden Seismically shallow depths; small targets Saskatchewan Geological Survey Open House, December 1,
11 Forward Modelling Theoretical Model Forward Model Saskatchewan Geological Survey Open House, December 1,
12 Forward Model vs. Depth Migrated Data Seismic Data Forward Model Saskatchewan Geological Survey Open House, December 1,
13 Outline Location Map Historical understanding of the Millennium area deposit model (pre 2006) forward modelling Surface 3D Seismic Survey source tests survey design resultant fold comparison with McArthur River (EXTECH IV) Additional seismic surveys borehole VSP/ MSP and Side-scan Data examples slices of 3D block, slices of 3D block with VSP block, unconformity map, structural update Updated 3D model (before & after) Conclusions Acknowledgments Saskatchewan Geological Survey Open House, December 1,
14 Source Tests 2 Lines centered over deposit Test sources: 1) Dynamite 2) Vibsist 3) Minivibe Saskatchewan Geological Survey Open House, December 1,
15 Source Tests Dynamite Source depth ~ 1.2 m Explosives size: 1/4 to 1/2 kg. Vibsist-1000 Impact rate = pbm; Impact plate = 800 x 800 mm (aluminum); Energy = 1500 J/impact; Sweep = 90 ms-230 ms in 25 s Minivibe Sweep = Hz, Linear; No. of Sweeps = 6; Sweep Length = 12 sec; Sampling rate = 1 ms; Modified from: Seismic source study; a comparison. E. Takacs & Z. Hajnal, UofS, 2009 Saskatchewan Geological Survey Open House, December 1,
16 Source Tests Dynamite Source depth ~ 1.2 m Explosives size: 1/4 to 1/2 kg. Vibsist-1000 Impact rate = pbm; Impact plate = 800 x 800 mm (aluminum); Energy = 1500 J/impact; Sweep = 90 ms-230 ms in 25 s Minivibe Sweep = Hz, Linear; No. of Sweeps = 6; Sweep Length = 12 sec; Sampling rate = 1 ms; Modified from: Seismic source study a comparison ;E. Takacs & Z. Hajnal, UofS, 2009 Saskatchewan Geological Survey Open House, December 1,
17 Source Tests Dynamite Source depth ~ 1.2 m Explosives size: 1/4 to 1/2 kg. Vibsist-1000 Impact rate = pbm; Impact plate = 800 x 800 mm (aluminum); Energy = 1500 J/impact; Sweep = 90 ms-230 ms in 25 s Minivibe Sweep = Hz, Linear; No. of Sweeps = 6; Sweep Length = 12 sec; Sampling rate = 1 ms; Modified from: Seismic source study a comparison ;E. Takacs & Z. Hajnal, UofS, 2009 Saskatchewan Geological Survey Open House, December 1,
18 Millennium 3D Seismic Grid Millennium Deposit Millennium Deposit Millennium Deposit Rx Tx Tx Rx Saskatchewan Geological Survey Open House, December 1,
19 Fold Comparison with the McArthur River Data Millennium Deposit McArthur Deposit From Györfi, 2004 Saskatchewan Geological Survey Open House, December 1,
20 Outline Location Map Historical understanding of the Millennium area deposit model (pre 2006) forward modelling Surface 3D Seismic Survey source tests survey design resultant fold comparison with McArthur River (EXTECH IV) Additional seismic surveys borehole VSP/ MSP and Side-Scan Data examples slices of 3D block, slices of 3D block with VSP block, unconformity map, structural update Updated 3D model (before & after) Conclusions Acknowledgments Saskatchewan Geological Survey Open House, December 1,
21 Seismic Techniques Applied at Millennium Saskatchewan Geological Survey Open House, December 1,
22 Borehole Seismic Surveys Location Map Saskatchewan Geological Survey Open House, December 1,
23 Scale of Seismic Techniques 2.5 km 300 m 2.5 km Saskatchewan Geological Survey Open House, December 1,
24 Resolution of Seismic Techniques West VSP Data CX-061 East Surface 3D Data Side-scan Data Depth (m) Saskatchewan Geological Survey Open House, December 1,
25 Outline Location Map Historical understanding of the Millennium area deposit model (pre 2006) forward modelling Surface 3D Seismic Survey source tests survey design resultant fold comparison with McArthur River (EXTECH IV) Additional seismic surveys borehole VSP/ MSP and Side-scan Data examples slices of 3D block, slices of 3D block with VSP block, unconformity map, structural update Updated 3D model (before & after) Conclusions Acknowledgments Saskatchewan Geological Survey Open House, December 1,
26 The Evolution of Seismic Processing Migrated sections from in-line 1219: A) after separate processing of the sparse and dense surveys, and only using the offset range m (initial processing in 2007); B) after combined processing of the sparse and dense surveys, including the full offset range; C) same as in B, but including more extensive residual statics. From: Processing and interpreting data from the 3D seismic survey at the Millennium uranium deposit in Saskatchewan, Canada. N. Juhojuntti, and C. Juhlin. October 2009 Saskatchewan Geological Survey Open House, December 1,
27 Line-0 3D Surface Seismic Cube Saskatchewan Geological Survey Open House, December 1,
28 Cross Line 300 m East of the Deposit (meters) Saskatchewan Geological Survey Open House, December 1,
29 Cross Line Through the Centre of the Deposit (meters) Saskatchewan Geological Survey Open House, December 1,
30 Cross Line 375 m West of the Deposit (meters) Saskatchewan Geological Survey Open House, December 1,
31 Outline Location Map Historical understanding of the Millennium area deposit model (pre 2006) forward modelling Surface 3D Seismic Survey source tests survey design resultant fold comparison with McArthur River (EXTECH IV) Additional seismic surveys borehole VSP/ MSP and Side-scan Data examples slices of 3D block, slices of 3D block with VSP block, unconformity map, structural update Updated 3D model (before & after) Conclusions Acknowledgments Saskatchewan Geological Survey Open House, December 1,
32 3D Seismic Unconformity Interpretation (meters) Saskatchewan Geological Survey Open House, December 1,
33 3D Seismic Unconformity Interpretation Saskatchewan Geological Survey Open House, December 1,
34 Conclusions Millennium Deposit Preliminary structures interpreted from the 3D seismic cube CX (meters) Saskatchewan Geological Survey Open House, December 1,
35 Acknowledgements A special thank you to the Cree-Ex exploration team for all their help and patience. Saskatchewan Geological Survey Open House, December 1,
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