Pseudorandom sweeps for simultaneous sourcing and low-frequency generation

@article{Sallas2011PseudorandomSF,
  title={Pseudorandom sweeps for simultaneous sourcing and low-frequency generation},
  author={John J. Sallas and John Gibson and Peter Maxwell and Forest Lin},
  journal={Geophysics},
  year={2011},
  volume={30},
  pages={1162-1172}
}
Over the past decade, there has been rather vigorous activity in developing simultaneous sourcing and slip-sweep techniques for vibroseis acquisition. Such methods include HFVS and C-HFVS (Krohn et al., 2010), ISS (Howe et al., 2008), DSSS (Bouska, 2010), and HPVA and V1 (Meunier and Bianchi, 2002). These methods provide improved vibrator productivity and create a means of cost-effectively improving source density and thus spatial sampling. Egan et al. (2010) have discussed the link between… 

Surface and downhole recording of pseudorandom vibroseis sweeps

The use of pseudorandom sweeps has received periodic attention over the last 45 years. Previous testing has indicated that hydraulic vibrators may struggle to transmit such sweeps due to their rapid

The use of pseudorandom sweeps for vibroseis surveys

Pseudorandom vibroseis sweeps have long been suggested as an alternative to standard linear sweeps due to their potential for having superior orthogonality, a lower likelihood for infrastructure

Establishing The Limits Of Vibrator Performance - Experiments With Pseudorandom Sweeps

Tests showed that vibrators can struggle to emit pseudorandom sweeps, particularly if they contain segments of the same polarity, sudden changes in instantaneous frequency, or small amplitude/high-frequency fluctuations.

Method of designing pseudorandom sweeps suitable for ISS acquisition

There is a weak cross-correlation between the pseudorandom sweeps generated, and, based on this property, two different types of aliased datasets for ISS acquisition are simulated, showing that while both kinds of acquisition methods partially suppress noise from adjacent shots, the latter shows a better suppression effect.

Field and Numerical investigation of filtered m-sequence pilots for Vibroseis acquisition

Summary We conducted a field test that indicated filtered m-sequences potentially to be just as effective as linear sweeps for controlling land vibrators in non-simultaneous operation. In another

Design and Application of Pseudorandom Coded Sweep for Mini-SOSIE

By comparing experimental field data from sources which is controlled by pseudorandom coding method and the rammer, the pseud orandom scheme yields significant improvements, and greatly improved signal-to-noise (SNR) and resolution.

Multiple simultaneous vibrators controlled by m-sequences

The increasing demand for high-resolution 3D seismic imaging is driving the search for methods of efficiently acquiring field datasets with hundreds of millions or even billions of seismic traces.

Methods of Minimizing and Suppressing the Correlation Noise of Simultaneously Operating Sources in a Vibroseismic Survey

Abstract—A seismologiсal survey with several simultaneous sources provides more data per time unit than a conventional one with a single source, and presents an opportunity to improve the seismic

Field testing of multiple simultaneous vibrator sources controlled by filtered m-sequences

Summary Theoretical analyses and numerical simulations predict that shifted m-sequences form quasi-orthogonal signals that are suitable pilots for driving multiple simultaneous land vibrators. Field

Combined focal and coherency-based deblending strategy

This work proposes using the output of a coherencybased deblending algorithm to provide a starting model for a sparsity-based deb lending algorithm that uses the focal transform as its main engine and shows that this strategy can be beneficial when the deblended solution does not have a sufficiently sparse representation in the transform domain.

References

SHOWING 1-10 OF 13 REFERENCES

Broadband Vibroseis Using Simultaneous Pseudorandom Sweeps

Simultaneous pseudorandom sweep technology (SPST) is a new method of Vibroseis acquisition that combines conventional, SPST and HFVS methods to develop subsurface images allowing a comparison of data quality and frequency content.

Extending Low Frequency Bandwidth Using Pseudorandom Sweeps

Analysis of field test data show that frequencies as low as 2 Hz can be recovered with useable signal-to-noise at reasonable fold, and special pseudorandom sweeps provide another viable option to address the challenges of low frequency energy.

Vibroseis productivity: shake and go

C-HFVS, which combines features of HFVS and cascaded sweep, has the potential to result in the highest productivity, without sacrificing either fine sampling or data quality.

Harmonic Noise Reduction Opens the Way For Array Size Reduction In VibroseisT Operations

To compensate for the reduced number of vibrators per shot point required by reductions in group interval and array size, either the recording time per surface unit must be increased or high order

Low-frequency vibroseis data with maximum displacement sweeps

Several recent advances in land-seismic acquisition equipment and processing algorithms have encouraged exploration geophysicists to reconsider the potential benefits of energetic low frequencies for

Developments in vibrator control

Hydraulic limitations, non‐rigidity of the baseplate as well as variable characteristics of the ground constantly distort the downgoing energy output by vibrators. Therefore, a real time feedback

The case for longer sweeps in vibrator acquisition

There is growing interest in the oil and gas industry to improve the quality of subsurface imaging and reservoir characterization through improved spatial sampling and wide-azimuth coverage of

How do hydraulic vibrators work? A look inside the black box

In order to have realistic expectations of what output is achievable from a seismic vibrator, an understanding of the machine's limitations is essential. This tutorial is intended to provide some

Digital Signal Processing: Principles, Algorithms, and Applications

This paper presents a meta-analysis of the Z-Transform and its application to the Analysis of LTI Systems, and its properties and applications, as well as some of the algorithms used in this analysis.

Distance separated simultaneous sweeping, for fast, clean, vibroseis acquisition

Distance separated simultaneous sweeping DS3 is a new vibroseis technique that produces independent records, uncontaminated by simultaneous source interference, for a range of offsets and depths that