Seismic Acquisition

Seismic Acquisition - Land and MarineS ism Acquisition...

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Land and Marine Seismic Acquisition from 2D to 3D From chapters 7-12 “Elements of 3D Seismology” by Chris Liner
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Outline-1 CMP METHOD (Harry Mayne) Seismic sensors geophones hydrophones gimballed geophones and hydrophones accelerometers Sources Explosives Vibroseis SEGY data
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Outline-2 Acquisition Parameters Time Sample Rate Offset Range Listen Time Sample Rate and Temporal Aliasing Geophone Spacing and Spatial Aliasing Shooting geometry inline cross-line
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Common Midpoint Method (CMP Method) Please take a look at the powerpoint presentation for the radio-telemetry field trip at the following link: http://www.geol.lsu.edu/Faculty/Juan/ReflectSeismol05/labs/ppt/Radio- telemetry.ppt This link has information to complement the explanation on the CMP method.
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Common Midpoint Method (CMP Method) Shotpoint # 1 Hydrophone groups #1 #2 #3 #4 #5 #6 Separation between midpoints is 1/2 separation between hydrophone groups Midpoints
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Common Midpoint Method (CMP Method) Shotpoint # 2 Hydrophone groups #1 #2 #3 #4 #5 #6 Midpoints
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Common Midpoint Method (CMP Method) Shotpoint # 3 Hydrophone groups #1 #2 #3 #4 #5 #6 Midpoints
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Common Midpoint Method (CMP Method) Shotpoint # 4 Hydrophone groups #1 #2 #3 #4 #5 #6 Mi dpoints
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Common Midpoint Method (CMP Method) Shotpoint # 5 Hydrophone groups #1 #2 #3 #4 #5 #6 Midp oints
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Common Midpoint Method (CMP Method) Shotpoint # 6 Hydrophone groups #1 #2 #3 #4 #5 #6 Midpoin ts
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Common Midpoint Method (CMP Method) Shotpoint # 7 Hydrophone groups #1 #2 #3 #4 #5 #6 Midpoints
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Common Midpoint Method (CMP Method) Shotpoint # 8 Hydrophone groups #1 #2 #3 #4 #5 #6 Midpoints
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Common Midpoint Method (CMP Method) Shotpoint # 8 Hydrophone groups #1 #2 #3 #4 #5 #6 Midpoints
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Common Midpoint Method (CMP Method) Hydrophone groups #1 #2 #3 #4 #5 #6 Midpoints Shotpoint # 1
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Common Midpoint Method (CMP Method) Hydrophone groups #1 #2 #3 #4 #5 #6 Midpoints Shotpoint # 1 Shotpoint # 2 Shotpoint # 1 Shotpoint # 2
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Common Midpoint Method (CMP Method) Hydrophone groups #1 #2 #3 #4 #5 #6 Midpoints Shotpoint # 1 Shotpoint # 2 Shotpoint # 1 Shotpoint # 2 Shotpoint # 3 Shotpoint # 3
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Common Midpoint Method (CMP Method) Hydrophone groups #1 #2 #3 #4 #5 #6 Midpoints Shotpoint # 1 Shotpoint # 2 Shotpoint # 1 Shotpoint # 2 Shotpoint # 3 Shotpoint # 3 Shotpoint # 4 Shotpoint # 4
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Common Midpoint Method (CMP Method) Hydrophone groups #1 #2 #3 #4 #5 #6 Midpoints Shotpoints # 1-8 1 2 3 4 5 6 7 8 13 8
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Common Midpoint Method (CMP Method) Midpoints 1 2 3 4 5 6 7 8 13 8 Fold Fold or Multiplicity is the number of times that the same midpoint is sampled by different shots and different receivers Signal-to-Noise increases as the square root of the fold Fold
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Common Midpoint Method (CMP Method) Midpoints 1 2 3 4 5 6 7 8 13 8 Maximum Fold is achieved after the 6th shot Maximum Fold is achieved after the 6th shot Fold
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Seismic Acquisition - Land and MarineS ism Acquisition...

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