Improving depth imaging of legacy seismic data using curvelet-based gather conditioning: A case study from Central Poland

Górszczyk, Andrzej; Cyz, M.; Malinowski, M.

doi:10.1016/j.jappgeo.2015.03.026

Cited by 9 publications

(8 citation statements)

References 12 publications

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“…This processing step was performed with a MATLAB toolbox developed by Górszczyk et al . 48 for the purpose of legacy seismic data processing and employing Discrete Curvelet Transform implementation of Candes et al . 49 Finally, a finite-difference migration algorithm, which is based on an implicit 45° migration in the time domain developed by Claerbout 50 , was used for post-stack time migration using GLOBE Claritas TM .…”

Section: Methodsmentioning

confidence: 99%

Emplacement and 3D geometry of crustal-scale saucer-shaped intrusions in the Fennoscandian Shield

Buntin

Malehmir

Koyi

et al. 2019

Sci Rep

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Saucer-shaped intrusions of tens of meters to tens of kilometres across have been observed both from surface geological mapping and geophysical observations. However, there is only one location where they have been reported to extend c. 100 km laterally, and emplaced both in a sedimentary basin and the crystalline basement down to 12 km depth. The legacy BABEL offshore seismic data, acquired over the central Fennoscandian Shield in 1989, have been recovered and reprocessed with the main goal of focusing on this series of globally unique crustal-scale saucer-shaped intrusions present onshore and offshore below the Bothnian Sea. The intrusions (c. 1.25 Ga), emplaced in an extensional setting, are observed within both sedimentary rocks (<1.5 Ga) and in the crystalline basement (>1.5 Ga). They have oval shapes with diameters ranging 30–100 km. The reprocessed seismic data provide evidence of up-doming of the lower crust (representing the melt reservoir) below the intrusions that, in turn, are observed at different depths in addition to a steep seismically transparent zone interpreted to be a discordant feeder dyke system. Relative age constraints and correlation with onshore saucer-shaped intrusions of different size suggest that they are internally connected and fed by each other from deeper to shallower levels. We argue for a nested emplacement mechanism and against a controlling role by the overlying sedimentary basin as the saucer-shaped intrusions are emplaced in both the sedimentary rocks as well as in the underlying crystalline basement. The interplay between magma pressure and overburden pressure, as well as the, at the time, ambient stress regime, are responsible for their extensive extent and rather constant thicknesses (c. 100–300 m). Saucer-shaped intrusions may therefore be present elsewhere in the crystalline basement to the same extent as observed in this study some of which are a significant source of raw materials.

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Section: Methodsmentioning

confidence: 99%

Emplacement and 3D geometry of crustal-scale saucer-shaped intrusions in the Fennoscandian Shield

Buntin

Malehmir

Koyi

et al. 2019

Sci Rep

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“…Before interpretation, we filter out (using curvelet transform; Górszczyk et al, 2015) some of the strong migration smiles apparent in the final PSDM sections, which after analysis in the pre-stack domain have been addressed as residual multiples or out-of-plane arrivals. To foster the joint interpretation of the PSDM results and FWI velocity models, we overlay the migrated section on the (i) FWI model, (ii) velocity gradient image, i.e., the average of the horizontal and vertical derivative of the FWI velocity model (Fig.…”

Section: Geological Consistencymentioning

confidence: 99%

Crustal-scale depth imaging via joint full-waveform inversion of ocean-bottom seismometer data and pre-stack depth migration of multichannel seismic data: a case study from the eastern Nankai Trough

Górszczyk

Operto²,

Schenini³

et al. 2019

Solid Earth

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Abstract. Imaging via pre-stack depth migration (PSDM) of reflection towed-streamer multichannel seismic (MCS) data at the scale of the whole crust is inherently difficult. This is because the depth penetration of the seismic wavefield is controlled, firstly, by the acquisition design, such as streamer length and air-gun source configuration, and secondly by the complexity of the crustal structure. Indeed, the limited length of the streamer makes the estimation of velocities from deep targets challenging due to the velocity–depth ambiguity. This problem is even more pronounced when processing 2-D seismic data due to the lack of multi-azimuthal coverage. Therefore, in order to broaden our knowledge about the deep crust using seismic methods, we present the development of specific imaging workflows that integrate different seismic data. Here we propose the combination of velocity model building using (i) first-arrival tomography (FAT) and full-waveform inversion (FWI) of wide-angle, long-offset data collected by stationary ocean-bottom seismometers (OBSs) and (ii) PSDM of short-spread towed-streamer MCS data for reflectivity imaging, with the former velocity model as a background model. We present an application of such a workflow to seismic data collected by the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) and the Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) in the eastern Nankai Trough (Tokai area) during the 2000–2001 Seize France Japan (SFJ) experiment. We show that the FWI model, although derived from OBS data, provides an acceptable background velocity field for the PSDM of the MCS data. From the initial PSDM, we refine the FWI background velocity model by minimizing the residual move-outs (RMOs) picked in the pre-stack-migrated volume through slope tomography (ST), from which we generate a better-focused migrated image. Such integration of different seismic datasets and leading-edge imaging techniques led to greatly improved imaging at different scales. That is, large to intermediate crustal units identified in the high-resolution FWI velocity model extensively complement the short-wavelength reflectivity inferred from the MCS data to better constrain the structural factors controlling the geodynamics of the Nankai Trough.

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“…The stacked section is obtained by CMP stacking, and steps (5) to ( 7) are conducted iteratively to obtain a stack section with high quality; 8. Finally, the F-X domain filtering and curvelet denoising (Górszczyk et al, 2015) are applied to the stacked profile to enhance the SNR.…”

Section: 1029/2022jb025748mentioning

confidence: 99%

“…After extensively performing experimental tests with various processing parameters, our optimum processing workflow is summarized as follows: The geometry correction is first applied to compensate for the wavefield spreading; The bandpass filtering is then performed to suppress noise at lower and higher frequencies, where the corner frequencies are set accordingly as follow: 8‐12‐40‐45 Hz in 0–2 s, 6‐10‐30‐35 Hz in 2–4 s, and 4‐6‐20‐25 Hz in 4–30 s, respectively; The F‐K domain filtering is conducted to eliminate the surface waves and airwaves; The elevation and refraction static corrections are then applied to correct for influences from the minor surface topography as well as the near surface low‐velocity zones (LVZ); The NMO correction is subsequently performed based on the velocity analysis; The residual static correction is also performed to improve the continuity of the reflection events; The stacked section is obtained by CMP stacking, and steps (5) to (7) are conducted iteratively to obtain a stack section with high quality; Finally, the F‐X domain filtering and curvelet denoising (Górszczyk et al., 2015) are applied to the stacked profile to enhance the SNR. …”

Section: Deep Seismic Profilingmentioning

confidence: 99%

Continent‐Continent Collision Between the South and North China Plates Revealed by Seismic Refraction and Reflection at the Southern Segment of the Tanlu Fault Zone

Luo

et al. 2023

JGR Solid Earth

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The Tanlu Fault Zone (TFZ) is considered as a suture of the intra‐continental collision between the South and North China plates, and it has attracted considerable geological, geochemistry, and geophysical investigations. However, its deep structures still lack clear delineation and the related tectonic processes are still debated without a clear consensus. To better characterize the TFZ as a plate boundary in east China, a 2‐D land seismic survey extending 87 km was conducted across its southern segment to investigate the underlying complex structures. Acoustic full‐waveform inversion (FWI) is applied to the early arrivals of the land seismic data to reconstruct the high‐resolution P‐wave velocity model of the upper crust (above ∼3.5 km). Structures of the crust and the uppermost mantle are further constrained through deep seismic profiling (DSP). The integrated geological interpretation from the FWI and DSP results suggests massive magma upwelling activities, characterized by the reflection‐free zone revealed by DSP and the high‐velocity anomaly recovered by FWI. The TFZ in the study area is found to be a deeply seated fault system with a positive flower structure at its shallow part, which suggests it has undergone a transpression regime. Also, the DSP result provides evidence for the subduction of the South China plate under the North China plate. Finally, a three‐stage model including the compression, transpression, and extension stages is proposed based on the new seismic results to better constrain the tectonic evolution of the southern segment of the TFZ.

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Improving depth imaging of legacy seismic data using curvelet-based gather conditioning: A case study from Central Poland

Cited by 9 publications

References 12 publications

Emplacement and 3D geometry of crustal-scale saucer-shaped intrusions in the Fennoscandian Shield

Emplacement and 3D geometry of crustal-scale saucer-shaped intrusions in the Fennoscandian Shield

Crustal-scale depth imaging via joint full-waveform inversion of ocean-bottom seismometer data and pre-stack depth migration of multichannel seismic data: a case study from the eastern Nankai Trough

Continent‐Continent Collision Between the South and North China Plates Revealed by Seismic Refraction and Reflection at the Southern Segment of the Tanlu Fault Zone

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