basalt layer seismic processing

basalt layer seismic processing - emirek

Processing tests show that basalt „layer‟ may contain multiple flows with erosion and sedimentation occurring between the flows. This can lead to strong absorption within the basalt and also significant 20Hz, can be used for sub-basalt seismic imaging and even . Advances in seismic imaging through basalts: a case study. New seismic reflection data have been used to image intra- and sub ...

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Basalt Layer Seismic Processing - ovafruit

Imaging below the basalt for hydrocarbon exploration is a global problem because of poor penetration and significant loss of seismic energy due to scattering attenuation absorption and mode-conversion when the seismic waves encounter a highly heterogeneous and rugose basalt layer. The conventional short offset seismic data acquisition processing and modeling techniques adopted by the oil

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Seismic wave propagation through an extrusive basalt ...

01/04/2016  Layers of basalt flows within sedimentary successions (e.g. in the Faeroe-Shetland Basin) cause complex scattering and attenuation of seismic waves during seismic exploration surveys. Extrusive basaltic sequences are highly heterogeneous and contain strong impedance contrasts between higher velocity crystalline flow cores (∼6 km s-1) and the lower velocity fragmented and weathered

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Multifocusing seismic processing to improve poor response ...

Multifocusing seismic processing to improve poor response areas below basalt layers, Cañadon Asfalto Basin (Argentina) D. Curia (WIAR)**, P. Veeken (WINZ)*, J.

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Sub-basalt Imaging of Hydrocarbon-Bearing Mesozoic ...

16/03/2018  Since basalt is highly heterogeneous, a significant amount of incident seismic energy is attenuated, converted and scattered while propagating through the basalt layer, hence the seismic image quality becomes very poor. Therefore, it is necessary to develop proper seismic data acquisition and processing techniques to deal with different type of waves generated at the basalt interface

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Basalt Layer Seismic Processing - ralcolor

basalt layer seismic processing baby-spel. Determining the Basaltic Sequence Using Seismic Reflection,The first layer is a thin layer of very dry weathered basalt, with an average value of ρ = 8430 Ohmm, and at a depth ranging from 1 to 75 m The value of apparent resistivity in the second layer is about ρ >4000 Ohmm and at depth ranging from 75 to 20 m, which might be com-prised of (PDF ...

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Seeing below the basalt – offshore Faroes - Gallagher ...

17/12/2007  This thick basalt layer obscures the deeper potentially prospective sedimentary section. Research has shown that basalt layers scatter the higher seismic frequencies (Pujol and Smithson 1991; Hobbs 2002) and deep towing of receiver cables can extend the seismic bandwidth towards lower frequencies (Ziolkowski et al. 2002).

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Experience with the issue of seismic surveying over basalts

basalt layers is very complex and conventional reflection seismic surveying is less effective, producing sub-surface images of variable quality. Figure 1 and Figure 2 present two shot gathers and one 2D seismic stack section from Peabody’s North Goonyella Mine. The basalt is located at the right end of the section. The data clearly shows that the basalt-cover seriously affects the signal-to ...

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(PDF) Coal seismic surveying over near-surface basalts ...

Seismic reflection sectionsThe data from this site were processed first using a conventional processing sequence, and Figure 14 shows a conventional poststack migrated seismic section for the part of line L-04 which crosses the basalt flow. Within the basalt flow, no reflections can be seen, but to either side strong reflections are present. To the north of the basalt, these can be correlated ...

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(PDF) Advanced processing of long-offset seismic data for ...

Advanced processing of long-offset seismic data for sub-basalt imaging in the Faeroe-Shetland Basin Hassan Masoomzadeh* and Penny J. Barton, University of Cambridge, Satish C. Singh, IPG Paris Summary the linear noise of ringing and multiplication, arrive tangentially at about the time of the reflection signal from A specialized strategy for long-offset data processing is the sub-basalt targets.

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Seeing below the basalt – offshore Faroes - Gallagher ...

17/12/2007  This thick basalt layer obscures the deeper potentially prospective sedimentary section. Research has shown that basalt layers scatter the higher seismic frequencies (Pujol and Smithson 1991; Hobbs 2002) and deep towing of receiver cables can extend the seismic bandwidth towards lower frequencies (Ziolkowski et al. 2002).

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(PDF) Faeroe Sub-Basalt Seismic Imaging - a New

Faeroe Sub-Basalt Seismic Imaging - a New Iterative Time Processing Approach . June 2001; DOI: 10.3997/2214-4609-pdb.15.O-20. Conference: EAGE 63rd Conference

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basalt layer seismic processing - club-fossa-mariana

where as on thick basalt layers, ... Figure 5: Typical seismic processing flowchart (HarbourDom ) Figure 6: Seismic cross section with picked reflectors. Get More; Improved signal processing for sub-basalt imaging. The seismic response of a thin basalt layer ... individual basalt layers. As observed by Widess (1973), the expected near-offset ...

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Improvement of sub-basalt imaging using parabolic tau-p ...

Such basaltic layers (up to several kilometers of stacked flows) create enormous problems for imaging underlying structures using conventional seismic acquisition and processing methods. Scattering from the highly reflective top of the basalt and short-period multiples from intra-basalt boundaries may completely mask reflections from the base of the basalt. Long-period multiples and the ...

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Integrated wide-angle and near-vertical subbasalt study ...

The model incorporates a 1.5-km-thick basalt layer overlying a 3.5-km-thick sedimentary section above basement. The sub-basalt sediments have a lower velocity than the layers above and beneath them. The arrivals of interest are the basalt re-fraction, the wide-angle reflection from the base of the basalt,

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Sub-basalt imaging: modeling and demultiple - CORE

Seismic imaging of sub-basalt sedimentary layers is difficult due to high impedance of the basalt layer, the roughness of the top and bottom of the basalt layer and sometimes the heterogeneities within the basalt layer. In this thesis we identify specific problems within the modern imaging which limit sub-basalt imaging. The basic framework for the identification of this limitation ...

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Revealing Complex Sub-Basalt Structures Offshore India ...

Sub-basalt seismic imaging is very challenging due to large impedance contrasts at sediment-basalt interfaces. The impedance of basalt usually gives a strong reflection coefficient at the top of basalt, and thus generates strong multiples. Offshore western India, this issue is compounded by short-period seabed multiples generated by the shallow sea floor. Moreover, the presence of the basalt ...

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Experience with the issue of seismic surveying over basalts

basalt layers is very complex and conventional reflection seismic surveying is less effective, producing sub-surface images of variable quality. Figure 1 and Figure 2 present two shot gathers and one 2D seismic stack section from Peabody’s North Goonyella Mine. The basalt is located at the right end of the section. The data clearly shows that the basalt-cover seriously affects the signal-to ...

More

(PDF) Coal seismic surveying over near-surface basalts ...

Seismic reflection sectionsThe data from this site were processed first using a conventional processing sequence, and Figure 14 shows a conventional poststack migrated seismic section for the part of line L-04 which crosses the basalt flow. Within the basalt flow, no reflections can be seen, but to either side strong reflections are present. To the north of the basalt, these can be correlated ...

More

(PDF) Advanced processing of long-offset seismic data for ...

Advanced processing of long-offset seismic data for sub-basalt imaging in the Faeroe-Shetland Basin Hassan Masoomzadeh* and Penny J. Barton, University of Cambridge, Satish C. Singh, IPG Paris Summary the linear noise of ringing and multiplication, arrive tangentially at about the time of the reflection signal from A specialized strategy for long-offset data processing is the sub-basalt targets.

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Effect of flood basalt stratigraphy on the phase of ...

Effect of flood basalt stratigraphy on the phase of seismic waveforms recorded offshore Faroe Islands Juerg Schuler 1, Philip A. F. Christie2, and Robert S. White ABSTRACT The generation of short-period multiples between highly heterogeneous layers of basalt flows can strongly alter transmit-ted seismic wavefields. These layers filter and modify penetrat-ingwaves,producingapparent ...

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Enhancing subbasalt reflections using parabolic transformation

seismic processing and subbasalt fea- ... ity factor of 30 for the basalt layer accounts for the attenuation of seismic energy within the basalts caused by internal multiple scattering. For sim-plification and because water-bottom multiples are relatively easy to elimi-nate from real data, we exclude them from our modeled data. Figure 2 illustrates a CMPgather for the 1D velocity model ...

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Integrated wide-angle and near-vertical subbasalt study ...

The model incorporates a 1.5-km-thick basalt layer overlying a 3.5-km-thick sedimentary section above basement. The sub-basalt sediments have a lower velocity than the layers above and beneath them. The arrivals of interest are the basalt re-fraction, the wide-angle reflection from the base of the basalt,

More

Sub-basalt imaging: modeling and demultiple - CORE

Seismic imaging of sub-basalt sedimentary layers is difficult due to high impedance of the basalt layer, the roughness of the top and bottom of the basalt layer and sometimes the heterogeneities within the basalt layer. In this thesis we identify specific problems within the modern imaging which limit sub-basalt imaging. The basic framework for the identification of this limitation ...

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Sub-basalt imaging in the Faroe-Shetland Basin using CSEM ...

of the basalt layer as well as sub-basalt strata have been pub-lished. For instance Fruehn et al. (2001) and White et al. (2003) used long offset rst arrivals for travel-time tomogra- phy in order to determine the sub-basalt velocities. However, the resulting velocity models lack resolution, and there is re-maining ambiguity in the interpretation of the base basalt and the top basement ...

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Basalt Layer Seismic Processing - abomiz

Basalt layer seismic processing velocity analysis in practice - xsgeo nevertheless velocity analysis is still one of the most time consuming parts of seismic processing it is also probably the most critical stage since the velocity analysis is an initia... Basalt ultrafine fiber scale multi. 2019-4-25continuous basalt fibershort for cbfis mainly based on natural lava which is put into melting ...

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GEO ExPro - Geology-Driven Subsurface Imaging in the

Welldefined interfingering of basalt flows and inter-lava sandstone are present in the Rosebank hydrocarbon discovery (Duncan et al., 2009) and new seismic data in the Erlend area reveals several similarities with the Rosebank type of play. Based on a combination of field and seismic examples from mid-Norway and the UK, including borehole data from the Rosebank field in the Faroe-Shetland ...

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