Big Cat

Big Cat

CGG acquired the 354-square-mile Big Cat 3D survey in Johnson County, Wyoming, adding to our extensive Powder River 3D library and targeting the Shannon, Sussex, Frontier, Muddy and Minnelusa formations. The Sercel UNITE wireless telemetry recording system was deployed with our 24-hour production methods and the patented EmphaSeis™ low-frequency sweep.

The processed Orthorombic PreSTM data volume is available .

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Acquisition Parameters


Survey Size: 354 square miles Bin Dimension 110’ x 100’
Record Length: 5 seconds Date Acquired: 2014
Recording System: Sercel UNITE 3.1_P7.01 Energy source: Vibroseis
Fold Coverage 132 @ Nominal
102 @ 13 500’
78 @ 11 500’
49 @ 8 500’

Receiver Information

Source Information

Receiver Interval:

220'

Source Interval:

220'
Receiver Line Spacing: 880' Source Line Spacing: 1320'
Receiver Line Orientation: 37º Azimuth Source Line Orientation: 217º Azimuth
Receiver Type: Sensor SM-24 Source Type: Nomad 65
Post Total Receiver Points: 55,156 Post Total Source Points: 41,484
Total Receiver Lines: 154 Total Source Lines: 103
Receivers per Square Mile: 144 Sources per Square Mile: 96
Elements/Receiver Array: 6/20' Circular Units/Source Array: 3/120' Inline
Inline Offset: 15,730' Maximum Far Offset: 18,412'
Crossline Offset: 9,570'
Recording Geometry: 220 x 168 groups Sample Rate: 2ms

  • 20 receiver lines x 168 channels per line. 11 line roll on/off. Fold on/off. Source staggered & centered between receiver lines 11 & 12.
  • 1 x 40 second, 4-88Hz EmphaSeis, .5 second start/end cosine tapers, 4 vibrators/array staggered & centered on flag.
  • 5 second record length
  • 110’ x 110’ bins.
  • 2,253 (approx.) linear receiver miles.
  • 1,502 (approx.) linear source miles.
  • Project zippered on both receiver & source overlap

The right data, in the right place, at the right time

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