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Junichi Takekawa
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Proceedings Papers

Accelerated augmented Lagrangian full-waveform inversion based on truncated randomized singular value decomposition

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Jiahang Li, Hitoshi Mikada, Junichi Takekawa
Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 27–September 1, 2023
Paper Number: SEG-2023-3910542
https://doi.org/10.1190/image2023-3910542.1
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View Paper titled, Accelerated augmented Lagrangian full-waveform inversion based on truncated randomized singular value decomposition
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Proceedings Papers

Hydrodynamic analysis of pipe-wall thinning due to flow accelerated corrosion

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Hiroki Sekiguchi, Hitoshi Mikada, Junichi Takekawa, Shibo Xu
Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 28–September 1, 2022
Paper Number: SEG-2022-3750970
https://doi.org/10.1190/image2022-3750970.1
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View Paper titled, Hydrodynamic analysis of pipe-wall thinning due to flow accelerated corrosion
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Proceedings Papers

The estimation of permeability using the shape parameter of the Weibull distribution

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Ryo Masumura, Hitoshi Mikada, Junichi Takekawa
Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3581975
https://doi.org/10.1190/segam2021-3581975.1
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View Paper titled, The estimation of permeability using the shape parameter of the Weibull distribution
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Proceedings Papers

Influence of eccentricity/tilted sonic logging tool on dispersive wave

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Kosuke Kayama, Hitoshi Mikada, Junichi Takekawa, Shibo Xu
Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583958
https://doi.org/10.1190/segam2021-3583958.1
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View Paper titled, Influence of eccentricity/tilted sonic logging tool on dispersive wave
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Proceedings Papers

Seismic Estimation of Spatial Distribution of Subsurface Stress Field -Analysis of Shear Wave Anisotropy Caused by Non-Hydrostatic Stress Components

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Yusuke Watanabe, Hitoshi Mikada, Junichi Takekawa
Paper presented at the Offshore Technology Conference Asia, November 2–6, 2020
Paper Number: OTC-30038-MS
https://doi.org/10.4043/30038-MS
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View Paper titled, Seismic Estimation of Spatial Distribution of Subsurface Stress Field -Analysis of Shear Wave Anisotropy Caused by Non-Hydrostatic Stress Components
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Proceedings Papers

Survey Performance of Deeply-Towed Marine Seismic Vibrator with Post-Survey Processing Optimized for Deeply-Towed Survey

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Hiroaki Ozasa, Eiichi Asakawa, Fumitoshi Murakami, Junichi Takekawa, Hitoshi Mikada
Paper presented at the Offshore Technology Conference Asia, November 2–6, 2020
Paper Number: OTC-30178-MS
https://doi.org/10.4043/30178-MS
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View Paper titled, Survey Performance of Deeply-Towed Marine Seismic Vibrator with Post-Survey Processing Optimized for Deeply-Towed Survey
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Proceedings Papers

Simple theory for processing reflection seismic data from moving offshore vibratory source

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Hiroaki Ozasa, Eiichi Asakawa, Fumitoshi Murakami, Junichi Takekawa, Hitoshi Mikada
Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3425982
https://doi.org/10.1190/segam2020-3425982.1
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View Paper titled, Simple theory for processing reflection seismic data from moving offshore vibratory source
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Proceedings Papers

High-resolution velocity estimation in sonic logging using full-waveform inversion

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Junichi Takekawa, Hitoshi Mikada, Kazuki Ishikura
Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215501
https://doi.org/10.1190/segam2019-3215501.1
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View Paper titled, High-resolution velocity estimation in sonic logging using full-waveform inversion
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Proceedings Papers

Survey performance of deeply-towed marine seismic vibrator: Comparative study with imaging results from an airgun array

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Hiroaki Ozasa, Eiichi Asakawa, Fumitoshi Murakami, Ehsan Jamali Hondori, Junichi Takekawa, Hitoshi Mikada
Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215492
https://doi.org/10.1190/segam2019-3215492.1
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View Paper titled, Survey performance of deeply-towed marine seismic vibrator: Comparative study with imaging results from an airgun array
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Proceedings Papers

Fundamental study for monitoring sweep front in foam-assisted EOR using seismic AVO analysis

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Rei Tamura, Hitoshi Mikada, Junichi Takekawa
Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2997522
https://doi.org/10.1190/segam2018-2997522.1
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View Paper titled, Fundamental study for monitoring sweep front in foam-assisted EOR using seismic AVO analysis
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Proceedings Papers

Realization of high signal-to-noise ratio offshore seismic survey with interferometric approach

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Hiroaki Ozasa, Eiichi Asakawa, Fumitoshi Murakami, Ehsan Jamali Hondori, Junichi Takekawa, Hitoshi Mikada
Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2998117
https://doi.org/10.1190/segam2018-2998117.1
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View Paper titled, Realization of high signal-to-noise ratio offshore seismic survey with interferometric approach
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Proceedings Papers

Frequency-domain acoustic-wave modeling using a mesh-free finite-difference method with optimal coefficients of the acceleration term

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Junichi Takekawa, Hitoshi Mikada
Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2998173
https://doi.org/10.1190/segam2018-2998173.1
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View Paper titled, Frequency-domain acoustic-wave modeling using a mesh-free finite-difference method with optimal coefficients of the acceleration term
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Proceedings Papers

A new frequency-domain finite-difference scheme with an elongated stencil for 2D acoustic wave simulation

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Junichi Takekawa, Hitoshi Mikada
Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17691003
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View Paper titled, A new frequency-domain finite-difference scheme with an elongated stencil for 2D acoustic wave simulation
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Proceedings Papers

Realization of offshore shear-wave survey with marine vibrator and interferometric approach

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Hiroaki Ozasa, Hiroaki Hatanaka, Yuki Nagai, Eiichi Asakawa, Fumitoshi Murakami, Ehsan Jamali Hondori, Junichi Takekawa, Hitoshi Mikada
Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17667651
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View Paper titled, Realization of offshore shear-wave survey with marine vibrator and interferometric approach
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Proceedings Papers

Estimate azimuthal shear-wave anisotropy by applying virtual-source method with a line of air-gun shots and a single ocean-bottom seismometer

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Yusuke Watanabe, Hitoshi Mikada, Junichi Takekawa
Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17666236
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View Paper titled, Estimate azimuthal shear-wave anisotropy by applying virtual-source method with a line of air-gun shots and a single ocean-bottom seismometer
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Proceedings Papers

S-wave AVO analysis for common scatter point gather for equivalent offset migration technique

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Tomoaki Tanaka, Hitoshi Mikada, Junichi Takekawa
Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17723539
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View Paper titled, S-wave AVO analysis for common scatter point gather for equivalent offset migration technique
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Proceedings Papers

Hydraulic-fracturing simulation in different differential stresses and anisotropic media

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Hayate Ohtani, Hitoshi Mikada, Junichi Takekawa
Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17745119
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View Paper titled, Hydraulic-fracturing simulation in different differential stresses and anisotropic media
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Proceedings Papers

Development of Marine Seismic Vibrator towards Realization of Shear Wave Source with No Touch-Down to Seafloor

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Hiroaki Ozasa, Fumio Sato, Eiichi Asakawa, Fumitoshi Murakami, Ehsan Jamali Hondori, Junichi Takekawa, Hitoshi Mikada
Paper presented at the International Petroleum Technology Conference, November 14–16, 2016
Paper Number: IPTC-18903-MS
https://doi.org/10.2523/IPTC-18903-MS
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View Paper titled, Development of Marine Seismic Vibrator towards Realization of Shear Wave Source with No Touch-Down to Seafloor
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Proceedings Papers

Fundamental study of seismic-emission tomography in terms of fluid-pressure fluctuations

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Akitomo Watanabe, Hitoshi Mikada, Junichi Takekawa
Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13882868
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View Paper titled, Fundamental study of seismic-emission tomography in terms of fluid-pressure fluctuations
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Proceedings Papers

Waveform analysis of borehole acoustic dipole data in transversely isotropic medium with a tilted axis of symmetry

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Satoshi Fuse, Hitoshi Mikada, Junichi Takekawa
Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13880506
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View Paper titled, Waveform analysis of borehole acoustic dipole data in transversely isotropic medium with a tilted axis of symmetry
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