Acoustic zoom high-resolution seismic beamforming for imaging specular and non-specular energy of deep oil and gas bearing geological formations

Guigné, J. Y.; Stacey, A.; Clements, C; Azad, Shervin; Pant, Aali; Gogacz, A.; Hunt, W. F.; Pace, Nicholas G.

doi:10.1016/j.jngse.2014.09.012

Cited by 14 publications

(14 citation statements)

References 20 publications

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“…This property is of advantage for diffraction enhancement as the reflection suppression is effective for both primary reflections and, to a certain degree, reflection multiples. In fact, most of the diffraction enhancement methods originate from multiple suppression methods or could also be used for multiple suppression (Bansal & Imhof, 2016; Guigné et al., 2014). So, reflection multiples are not problematic after diffraction enhancement.…”

Section: Discussionmentioning

confidence: 99%

“…The approach chosen is only applicable for little lateral velocity variation and negligible refraction of the waves limiting the angles used to about 40°. Choosing different and more exact travel time calculation equations than Equation 1 as shown in Guigné et al (2014) has the potential to improve the beamforming results and potentially the positioning for more complicated imaging settings.…”

Section: Diffraction Target Validation Via Seafloor Bouldersmentioning

confidence: 99%

“…Swath coverage is achieved by using a planar array, which allows the differentiation of different signal origins (reflections vs. diffractions) and a 3D diffraction localization. Using a planar array, full 3D imaging and precise localization as in Guigné et al (2014) is possible. When only 2D data as shown in Ford et al ( 2021) is acquired and used for diffraction imaging, the localization of diffractors is not precise and diffraction shadows occur.…”

Section: Characteristics Of the Acquisition Systemmentioning

confidence: 99%

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Boulder Detection in the Shallow Sub‐Seafloor by Diffraction Imaging With Beamforming on Ultra‐High Resolution Seismic Data—A Feasibility Study

Römer-Stange

Wenau

Bihler

et al. 2022

Earth and Space Science

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Small‐scale heterogeneities within the seafloor such as glacial boulders, concretions, or unexploded ordnance are of major scientific and economic interest. Because of their small size, such objects are hardly imageable by conventional seismic methods since they produce only faint diffractions. Despite the growing interest, reliable and efficient object detection methods are still not established. So, a marine acquisition system to image objects in the size range 0.3–4.1 m in the near‐surface has been designed and workflows have been developed. Source signals with a central frequency of ∼1,000 Hz are necessary to generate diffractions for the object size range. Performing beam pattern analyses, a rigid tow frame with the dimensions 8 × 3 m and attached hydrophones was designed. A synthetic aperture approach is realized to improve the resolution. Reflection events are suppressed in Normal‐Move‐Out corrected shot gathers by the muting of high singular values to enhance the diffractions. The diffractions are imaged with a beamforming algorithm with a high efficiency, as a total swath angle of about 80° in across‐track direction is covered. The processing of synthetic data sets allows an optimization and validation of the workflow and sensitivity analyses. Ground truthing is achieved with 1–2 m large boulders on the seafloor in 22 m depth, which were identified in a Multi‐Beam Echo Sounder data set. Although diffractions are only weak events in seismic data sets, 3D object detection with seismic beamforming has been found to be an efficient and reliable method to perform derisking for offshore infrastructure installations, drillings, or geologic interpretation.

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Section: Discussionmentioning

confidence: 99%

Section: Diffraction Target Validation Via Seafloor Bouldersmentioning

confidence: 99%

Section: Characteristics Of the Acquisition Systemmentioning

confidence: 99%

See 1 more Smart Citation

Boulder Detection in the Shallow Sub‐Seafloor by Diffraction Imaging With Beamforming on Ultra‐High Resolution Seismic Data—A Feasibility Study

Römer-Stange

Wenau

Bihler

et al. 2022

Earth and Space Science

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“…Another directional seismic wave method known as the acoustic zoom high‐resolution beamforming technique, which effectively improves the resolution of seismic imaging results, was later proposed by Guigné et al . (). In 2016, pattern recognition techniques achieved through the Hough transform and computer imaging techniques showed promise for further extending and enhancing existing beamforming techniques (Guigné et al .…”

Section: Introductionmentioning

confidence: 97%

“…In 2012, Ge et al used a numerical simulation to show that it is both feasible and beneficial to implement a phased array vibrator system tech-nique in the exploration of mineral resources by the numerical simulation (Ge et al 2012). Another directional seismic wave method known as the acoustic zoom high-resolution beamforming technique, which effectively improves the resolution of seismic imaging results, was later proposed by Guigné et al (2014). In 2016, pattern recognition techniques achieved through the Hough transform and computer imaging techniques showed promise for further extending and enhancing existing beamforming techniques (Guigné et al 2016).…”

mentioning

confidence: 99%

The application of variable‐frequency directional seismic wave technology under complex geological conditions

Yue

Tao

Zhou

2018

Near Surface Geophysics

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Monofrequency directional seismic wave technology can be used to manipulate the phases of seismic waves, thereby focusing seismic signals into beams and strengthening the energy in the main beam direction. However, it is unknown whether a variable‐frequency signal can form a directional seismic wave, and the applicable conditions for utilizing this technology have not yet been reported. In this paper, we analysed the variable‐frequency directional seismic wave theory and methodology through ray tracing and the seismic wave equation. Based on the variable‐frequency directional seismic wave principle, the effects of directional parameters on the main beam direction and half‐power beamwidth were discussed in detail. In addition, the effectiveness of the variable‐frequency directional seismic wave method in several complicated velocity models was discussed. Numerical tests with the variable‐frequency directional seismic wave technique indicated that the energy intensity in the main beam direction increased by two to six times and the signal‐to‐noise ratio of the targets signal increased by 0.60–0.84 dB. Additionally, we used variable‐frequency directional seismic wave technology to analyse a shallow geological structure with a 9‐vibrator array in an area of Jilin Province. The field experiment results revealed that the near‐surface exploration depth increased from 60 to 240 m. Therefore, under complex geological conditions, the variable‐frequency directional seismic wave technology can improve the target signal at little cost.

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Imaging of the Near-Surface

Guigné

Blondel

2017

SpringerBriefs in Oceanography

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Acoustic zoom high-resolution seismic beamforming for imaging specular and non-specular energy of deep oil and gas bearing geological formations

Cited by 14 publications

References 20 publications

Boulder Detection in the Shallow Sub‐Seafloor by Diffraction Imaging With Beamforming on Ultra‐High Resolution Seismic Data—A Feasibility Study

Boulder Detection in the Shallow Sub‐Seafloor by Diffraction Imaging With Beamforming on Ultra‐High Resolution Seismic Data—A Feasibility Study

The application of variable‐frequency directional seismic wave technology under complex geological conditions

Imaging of the Near-Surface

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