Over/under towed-streamer acquisition: A method to extend seismic bandwidth to both higher and lower frequencies

Moldoveanu, Nick; Combee, L.; Egan, Mark S.; Hampson, Gary; Sydora, Larry; Abriel, William L.

doi:10.1190/1.2431831

Cited by 60 publications

(17 citation statements)

References 6 publications

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“…Ghost reflections can strongly modulate the spectrum and reduce the energy at notch frequencies. New streamer technology has been developed for deploying multi-depth streamers in a vertical plane with a sufficient accuracy and the data acquired by over/under streamers could be used to eliminate the ghost reflections, thus extended the seismic bandwidth (Monk 1990;Moldoveanu et al 2007;Ferber 2008;Özdemir et al 2008). Furthermore, reverberations can be rejected using a mode forming technique with a vertical line array (Arvelo and Zabal 1997).…”

Section: Introductionmentioning

confidence: 99%

Water Reverberation Travel Time Analysis Acquired Using Multi-Depth Streamers

Tseng¹,

Chang²,

Chang³

et al. 2016

Terr. Atmos. Ocean. Sci.

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Ghost reflections and water reverberations are major and inevitable seismic noises in marine seismic exploration. More recently, new receiver deployment techniques at different sea depths for signal-to-noise ratio (SNR) enhancement are developing. The reverberation characteristics must be known before applying the reverberation attenuation methods. This paper studies the characteristics of reverberations acquired using multi-depth streamers by analyzing the seismic ray path geometry and the scaled physical model data. The study results show that the primary reflection waveforms and reverberations are broadened with an increase in offset. The reverberation waveforms are quite different from those of primary reflections due to the wide-angle reflection. Under shallow water and small spread approximation, new arrival time equations for the primary reflections and reverberations are derived and fit the scaled physical model data very well. The depth-arrival time relationships of the primary reflections and reverberations in the common-source vertical-array gather are linear but their depth-arrival time relationship slopes are different. The primary reflection slopes are the same for different common-source vertical-array offsets but the reverberation slopes increase with offsets.

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Section: Introductionmentioning

confidence: 99%

Water Reverberation Travel Time Analysis Acquired Using Multi-Depth Streamers

Tseng¹,

Chang²,

Chang³

et al. 2016

Terr. Atmos. Ocean. Sci.

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“…In practice, not all of these field quantities might be available, or they might be obscured by different sensor characteristics (Schalkwijk et al, 2003). In the MDL decomposition scheme, the decomposition problem is treated slightly different (Moldoveanu et al (2007), Grobbe et al (2013)). We write the decomposed downgoing and upgoing flux-normalized wavefields at one depth level in terms of the other, respectively:…”

Section: Theorymentioning

confidence: 99%

“…The approximation sign is applied because this equation is not valid for the evanescent wavefield. Using these wavefield extrapolation operators, we can express the one-way wavefields at one level in terms of the observed fields at multiple levels, which forms the basis of the MDL decomposition scheme (Moldoveanu et al (2007), Grobbe et al (2013)). Let us now look at the decomposition problem as an inverse problem.…”

Section: Theorymentioning

confidence: 99%

“…Inspired by marine acquisition designs that make use of recordings at multiple depth levels for successful wavefield decomposition (e.g. Moldoveanu et al (2007)), we have developed a multi-depth level (MDL) wavefield decomposition scheme for land acquisition (Grobbe et al, 2013). We now interpret MC wavefield decomposition as an inverse problem.…”

Section: Introductionmentioning

confidence: 99%

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Wavefield Decomposition of Field Data, Using a Shallow Horizontal Downhole Sensor Array and a Free-surface Constraint

et al. 2014

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SUMMARYSeparation of recorded wavefields into downgoing and upgoing constituents is a technique that is used in many geophysical methods. The conventional, multi-component (MC) wavefield decomposition scheme makes use of different recorded wavefield components. In recent years, land acquisition designs have emerged that make use of shallow horizontal downhole sensor arrays. Inspired by marine acquisition designs that make use of recordings at multiple depth levels for wavefield decomposition, we have recently developed a multi-depth level (MDL) wavefield decomposition scheme for land acquisition. Exploiting the underlying theory of this scheme, we now consider conventional, multi-component (MC) decomposition as an inverse problem, which we try to constrain in a better way. We have overdetermined the inverse problem by adding an MDL equation that exploits the Dirichlet free-surface boundary condition. To investigate the successfulness of this approach, we have applied both MC and combined MC-MDL decomposition to a real land dataset acquired in Annerveen, the Netherlands. Comparison of the results of overdetermined MC-MDL decomposition with the results of MC wavefield decomposition, clearly shows improvements in the obtained one-way wavefields, especially for the downgoing fields.

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“…However, the complexity of structure necessitates higher technology in the data acquisition and processing. Singh, et al, 1996al., 1996al Moldoveanu, et al, 2007 Maas, et al, 2004Hornby, et al, 2004Hornby, et al et al, 2005Thompson, et al, 2005Thompson, et al et al, 2006et al Keul, et al, 2005 et al Shindo, et al, 2001Shindo, et al, . et al, 2001 .…”

mentioning

confidence: 99%

The latest tendency in development of exploration geophysics-Importance of spatiotemporal scales-

Mikada¹

2008

J. JAPANESE. ASSOC. PETROL. TECHNOL.

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Geophysical exploration technologies have been developed through several innovative steps in the history. Data acquisition and processing technologies evolved since 1960s. Since 1980s, these technologies started to be integrated fi rst to reservoir description, then to reservoir modeling characterization , and recently to reservoir management technologies. These developments have taken place due to the recent tendency to have their target structures in smaller scale or more complex than it used to be. We may summarize these technical developments as follows a 3D to 4D data acquisition to realize reservoir management, b 4-C marine data acquisition tri-component geophone and pressure gauge , c single sensor acquisition supported by well-developed multi-channel signal processing techniques for true amplitude recovery without any instrumental spatial fi ltering, d new acquisition technologies such as fi ber-optic sensor arrays. We believe that further new development would surely be attempted to satisfy the needs to visualize underground structure, to understand what is on-going for the state of natural resources under development, and to enhance our management capabilities to control the production from existing reservoir.

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Over/under towed-streamer acquisition: A method to extend seismic bandwidth to both higher and lower frequencies

Cited by 60 publications

References 6 publications

Water Reverberation Travel Time Analysis Acquired Using Multi-Depth Streamers

Water Reverberation Travel Time Analysis Acquired Using Multi-Depth Streamers

Wavefield Decomposition of Field Data, Using a Shallow Horizontal Downhole Sensor Array and a Free-surface Constraint

The latest tendency in development of exploration geophysics-Importance of spatiotemporal scales-

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