Use of low-frequency signals to improve imaging quality under high-velocity basalt

She, De-Ping; Guan, Lei; Ying, Xu; Li, Pei

doi:10.1007/s11770-006-0017-0

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…An Xueyong [9] and Zhao Jianzhang [10] put forward the suggestion of seismic acquisition survey parameters in view of the problems of the development of the surface layer and the superficial layer. She Deping [11] [12] using wave equation wave field numeric simulation technique, showed the low frequency signals having strong capacity both penetrating thin shielding high velocity basalt and reducing diffraction noises produced from rough surface, improving the imaging quality of deep beds below the shielding layer through using low frequency. Zhang Guangde [13] introduced geometry optimization using 3-D Gaussian beam forward modeling theory.…”

Section: Introductionmentioning

confidence: 99%

3D Seismic Acquisition Technology and Effect in HX Volcanic Area in Liaohe Depression

Wang¹,

Liu²,

Zou³

et al. 2016

IJG

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Multi-stages volcanic are available in HX area, shielding the seismic waves. Previous seismic acquisitions of large size bin, less fold coverage and narrow azimuth result in indistinct fault images, low S/N ratio and the difficulty of multi-stages volcanic characterization. In reference to the successful experience of domestic and overseas volcanic exploration, the low frequency excitation and receiving, and survey with wide range, high coverage, wide azimuth should be paid more attention, associated with two-dimensional and three-dimensional wave equation forward modeling and real data processing contrast analysis method. The image of underlying strata and fault are remarkably improved in the new method, according to the processing results of new seismic data. The new method will provide technical reference for the similar volcanic development area in the future seismic acquisition design.

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Section: Introductionmentioning

confidence: 99%

3D Seismic Acquisition Technology and Effect in HX Volcanic Area in Liaohe Depression

Wang¹,

Liu²,

Zou³

et al. 2016

IJG

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“…There are two main reasons why the use of low-frequency sources improves subbasalt reflection images: (1) the low frequencies generated by a seismic shot travel much further than high frequencies because basalts are often interbedded with thin layers of sediments and act as a low-pass filter (Mack, 1997;Ziolkowski et al, 2003;She et al, 2006;Lau et al, 2007), and (2) low frequencies are less sensitive to small heterogeneities (Fu, 2002(Fu, , 2003Ziolkowski et al, 2003). In Ziolkowski et al (2003), the effectiveness of low-frequency sources is demonstrated by comparing data acquired using low-frequency sources with conventional data acquired along the same line.…”

Section: Introductionmentioning

confidence: 99%

Coal seismic surveying over near-surface basalts: Experience from Central Queensland, Australia

Zhou

Hatherly

Peters³

et al. 2014

GEOPHYSICS

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Seismic reflection surveying in basalt-covered areas often fails to image underlying reflectors. To gain insights into the nature of the problem and obtain potential solutions, we have conducted experimental 2D seismic reflection and offset VSP surveys at two coal mines in the Bowen Basin of Australia. At the first mine, the basalt is relatively deep (114 m) and relatively thin (20 m). Conventional seismic acquisition and processing of a 2D seismic line provide poor results. However, upgoing reflections from layers below the basalt are clearly evident in the VSP survey and prestack depth migration is able to improve the continuity of the reflectors beneath the basalt. At the second mine, the 360 m wide basalt is at a depth of 40 m and has a thickness of about 40 m. It is fresh and unweathered and consists of multiple flows which are interlayered with unconsolidated sediments.Long-offset data acquisition combined with prestack depth migration was expected to produce satisfactory results but this is not the case. The associated VSP survey suggests that the problems at this mine are due to (1) the generation of complex downgoing and upgoing wave-fields within the basalt and (2) significant scattering of surface waves from outside the basalt at the margins of the basalt. Another problem is that the target coal seams are at about 300 m depth and the muting required to remove refraction events limited the effectiveness of the prestack depth migration. Reducing the strength of the surface waves through selection of an appropriate source and placement of shots at the base of the low-velocity zone (as had been the case at the first mine) will therefore improve the chances for a successful outcome. A Vibroseis survey subsequently undertaken at the second mine, which produced shot records with reduced surface waves, shows this to be the case.

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Low-Frequency Sweep Design—A Case Study in Middle East Desert Environments

Qi,

Wei,

Nie

et al. 2024

Appl. Geophys.

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Use of low-frequency signals to improve imaging quality under high-velocity basalt

Cited by 4 publications

References 7 publications

3D Seismic Acquisition Technology and Effect in HX Volcanic Area in Liaohe Depression

3D Seismic Acquisition Technology and Effect in HX Volcanic Area in Liaohe Depression

Coal seismic surveying over near-surface basalts: Experience from Central Queensland, Australia

Low-Frequency Sweep Design—A Case Study in Middle East Desert Environments

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