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Results
Summary HFVS recording can be used to increase production rates and reduce costs for acquisition or to increase spatial sampling and improve data quality. With the HFVS technique, data from multiple vibrators sweeping simultaneously can be separated with 60 dB of separation. Superior separation is achieved, because measured vibrator signatures from multiple sweeps and multiple vibrators are used to design an optimal separation and inversion filter. Examples are shown of data quality improvements compared with traditional vibrator arrays from reduction of intra-array effects and suppression of ground roll. Improvements in data quality from reduced correlation sidelobes, harmonic noise, and coupling variations and the ability to accurately pick firstarrival times and control phase are discussed in a first paper (Krohn and Johnson, 2003). Separation Method HFVS technology includes the capability to optimally separate data from multiple vibrators as illustrated in Figure 1.
Summary We present here a novel combination of heritage-Mobil and heritage-Exxon vibrator technologies, which improves on both. The following problems with vibratory data are solved or reduced: first-arrival times difficult to pick first-arrival times not accurate well ties poor pulses ring from correlation sidelobes noise from harmonic ghosts vibrator coupling differences In addition, data from multiple vibrators can be separated by 60 dB or more. The advantages of processing separated vibrator data as unique source points are discussed in a second paper (Krohn and Johnson, 2003). The method involves vibrator separation combined with vibrator signature deconvolution in such a manner that the output is rigorously minimum phase and matches dynamite data. Vibrator signatures are calculated from the vibrator ground force signals. The signatures from multiple vibrators and multiple sweeps are used to design a one-step separation filter, which optimally separates the data from each vibrator and replaces the sweeps with a specially designed impulse response. Specific procedures are included to reduce the effects of inversion noise.
- Geophysics > Seismic Surveying > Seismic Processing (0.70)
- Geophysics > Seismic Surveying > Seismic Interpretation > Well Tie (0.35)
- Geophysics > Seismic Surveying > Borehole Seismic Surveying > Vertical Seismic Profile (VSP) (0.35)
- Geophysics > Seismic Surveying > Surface Seismic Acquisition > Land Seismic Acquisition (0.31)