Dual‐sensor summation of noisy ocean‐bottom data

Ball, Vaughn; Corrigan, Dennis A.

doi:10.1190/1.1826622

Cited by 20 publications

(8 citation statements)

References 2 publications

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“…Figure 1 shows the up-going and down-going recordings by hydrophone and geophone on the sea floor. Both hydrophone and geophone record same polarity for wavefield coming from below the sea floor; however they record opposite polarity when coming from above the sea floor (Barr et al, 1989;Dragoset et al, 1994;Ball, 1996;Barr et al, 1997;Bale, 1998). …”

Section: Wavefield Separationmentioning

confidence: 91%

Seismic Imaging with Ocean-Bottom Nodes (OBN): Mirror Migration Technique

Pacal¹,

Stewart

Baysal

et al. 2015

SEG Technical Program Expanded Abstracts 2015

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The limitations in conventional marine seismic surveys such as imaging of complicated geology in deep water motivate a quest for new and alternative technologies such as OBNs (ocean-bottom nodes). High-quality data from the sea floor can be acquired with ocean-bottom node acquisition techniques which can provide wide-azimuth data set with sparse receiver interval and dense source interval. The main challenge with the ocean-bottom nodes is now processing and imaging of the data. The mirror migration technique is an effective solution for this challenge by separation of the seabed hydrophone and geophone data into up-going and down-going waves.In this study we apply the mirror migration method on a real OBN dataset and demonstrate that using multiples to image the shallow sea bottom improves the continuity and image quality, which is very important for subsurface depth/velocity model derivation. We also demonstrate the challenges associated with such datasets.

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Section: Wavefield Separationmentioning

confidence: 91%

Seismic Imaging with Ocean-Bottom Nodes (OBN): Mirror Migration Technique

Pacal¹,

Stewart

Baysal

et al. 2015

SEG Technical Program Expanded Abstracts 2015

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“…Several methods are in the literature on the separation of the up-going and down-going elastic wavefields in seafloor seismic data by a combination of the hydrophone record (wavefield pressure, H) and a scaled version of the vertical component geophone record (G) for the removal of reverberations and multiples from the seismic record (Loewenthal et al, 1985;Barr and Sanders, 1989;Draggoset and Barr, 1994;Paffenholz and Barr, 1995;Ball and Corrigan, 1996;Soubaras, 1996;Bale, 1998). Most of these methods require the reflection coefficient at the seafloor to be accurately estimated to have success in multiple suppression.…”

Section: Review Of Wave Field Separation Methodsmentioning

confidence: 99%

An improved dual sensor summation method with application to four-component (4-C) seafloor seismic data from the Niger Delta

Ogagarue¹,

Ebeniro²

2015

ESR

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Conventional towed streamer seismic acquisition has proven highly effective over the years for 3D subsurface imaging. However, in areas where water depths are too shallow or where there are too many obstacles for streamer operations, seabed seismic sensors have, in some cases, been employed as an alternative to image the subsurface. Apart from seabed seismic acquisition being extremely expensive compared to surface streamer, seabed seismic data are severely affected by receiver ghosts generated by water column reverberation. We present an improved method of summing the pressure (hydrophone data) and vertical geophone (geophone data) data to reduce the deleterious effects of ghosts and water column reverberations in a seabed seismic data acquired at water depths ranging from 21.1m to 40.0m in the Niger Delta. The method is based on the separation of up and down-going elastic wavefields from the geophone and hydrophone data, and provides an efficient noise rejection and amplitude preservation in the summed data.

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“…The advantage to OBS acquisition in this area is the ability to separate the upgoing data from the downgoing and therefore remove the receiver side ghost and water layer multiples. The method used to generate the upgoing for this Clair project is PZ summation, scaling the Z component as a function of the calculated seabed reflection coefficient (Ball and Corrigan, 1996). Prior to summation the geophone data is matched to the hydrophone data using the upgoing refractor of the hydrophone (P) and Geophone (Z) data (Shalkwijk et al 1999: Melbo et al 2002.…”

Section: Figurementioning

confidence: 99%

Surface Multiple Attenuation Developments in the Clair Field

Dawson¹,

Wolfarth²,

Leone³

et al. 2014

Proceedings

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Multiples are a key problem over the Clair area, mainly caused by the complexity in the overburden. The paper describes a much improved combination of demultiples techniques, which have been applied to the latest Clair South West HDOBC survey. The sequence consists a top-down approach removing successive multiples with PZ summation, Wavefield Extrapolation Multiples Modeling, GSMP and TauPQ deconvolution. Water bottom WEMM plays a key role, effectively predicting water layer multiples in a 3D sense. GSMP complements the results of the other techniques against short period multiples, but more importantly it also predicts other long period surface multiples which are cutting through at reservoir level. The results are a much improved level of multiples suppression, although some surface multiples contamination is still present, and internal multiples have not been attenuated.

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Dual‐sensor summation of noisy ocean‐bottom data

Cited by 20 publications

References 2 publications

Seismic Imaging with Ocean-Bottom Nodes (OBN): Mirror Migration Technique

Seismic Imaging with Ocean-Bottom Nodes (OBN): Mirror Migration Technique

An improved dual sensor summation method with application to four-component (4-C) seafloor seismic data from the Niger Delta

Surface Multiple Attenuation Developments in the Clair Field

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