Updated on 2024/05/21

写真a

 
UEDA, Takumi
 
Affiliation
Faculty of Science and Engineering, School of Creative Science and Engineering
Job title
Professor
Degree
Ph.D. (Geophysics) ( 2007.05 University of Utah )
修士(工学) ( 2002.03 早稲田大学 )

Research Experience

  • 2017.04
    -
    2024.03

    Waseda University Faculty of Science and Engineering

  • 2024.04
    -
    Now

    Waseda University, Faculty of Science and Engineering   School of Creative Science and Engineering   Professor

  • 2017.04
    -
    Now

    National Institute of Advanced Industrial Science and Technology

  • 2016.04
    -
    2017.03

    National Institute of Advanced Industrial Science and Technology

  • 2015.04
    -
    2016.03

    National Institute of Advanced Industrial Science and Technology

  • 2007.04
    -
    2015.03

    National Institute of Advanced Industrial Science and Technology

  • 2002.08
    -
    2007.03

    University of Utah   Dept. of Geology and Geophysics

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Education Background

  •  
    -
    2007

    University of Utah   College of Mines and Earth Science   Department of Geology and Geophysics  

  •  
    -
    2002

    Waseda University  

  •  
    -
    2000

    Waseda University   School of Science and Engineering  

Committee Memberships

  • 2020.07
    -
    Now

    物理探査学会  学術講演委員会

  • 2020.07
    -
    Now

    物理探査学会  会誌編集委員会 副委員長

  • 2019.07
    -
    Now

    物理探査学会  代議員

  • 2018.07
    -
    Now

    物理探査学会  国際委員会

  • 2018
    -
    Now

    東京大学地震研究所  高エネルギー素粒子地球物理学公募研究委員会

  • 2016.07
    -
    2020.06

    物理探査学会  会誌編集委員会

  • 2010.07
    -
    2015.06

    物理探査学会  ニュース委員会

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Professional Memberships

  •  
     
     

    日本計算工学会

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    Society of Exploration Geophysicists

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    物理探査学会

Research Areas

  • Applied mathematics and statistics   Inverse problem, inversion / Earth resource engineering, Energy sciences   Exploration Geophysics, Electromagnetic exploration, Electric exploration / Solid earth sciences

Research Interests

  • Exploration Geophysics

  • Electromagnetic exploration

  • Electric exploration

  • Inverse problem

  • Applied Geophysics

  • geophysics

  • Deep Learning

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Papers

  • A novel method for processing noisy magnetotelluric data based on independence of signal sources and continuity of response functions

    Hiroki Ogawa, Koichi Asamori, Tateyuki Negi, Takumi Ueda

    Journal of Applied Geophysics   213  2023.06

     View Summary

    Various schemes for processing magnetotelluric (MT) data have been reported aiming at suppressing the strong effect of artificial electromagnetic noises, especially coherent noise that is correlated between electric and magnetic time series. Many of the recent denoising schemes are based on decomposing MT data into the responses of the natural signals and noises. However, a steady differentiation of the natural signals from noises independent of any empirical choice of parameter setting is critically important. In addition, improper subtraction of values from the separated signals can lead to losing useful values of the natural signals or missing noise-affected values, which may result in failure in deriving the true MT responses. We propose a novel data-processing method that applies frequency-domain independent component analysis (FDICA) to both the local MT data and the reference magnetic data. Among the separated signals, the proposed method can quantitatively distinguish the natural signals from the noise-affected components by calculating the ratio of the cross-power spectrum with the reference data to the auto-power spectrum for each component. When determining which values to subtract from the separated signals, we introduce an evaluation index with respect to two characteristics of the MT response function: stationarity in the time domain and smoothness in the frequency domain. We conducted two types of experiments: with MT time series severely contaminated by synthetic coherent noises and with MT field data interfered with direct-current (DC) railways. Consequently, we confirmed the noise-suppression performance superiority of the proposed method over the conventional methods of MT data processing.

    DOI

    Scopus

  • A proposal of optimum calculation settings of continuous wavelet transform in magnetotelluric data processing

    Ogawa Hiroki, Hama Yuki, Asamori Koichi, Ueda Takumi

    BUTSURI-TANSA(Geophysical Exploration)   75   38 - 55  2022

     View Summary

    In the magnetotelluric (MT) method, so as to identify the subsurface resistivity structure, the apparent resistivity and phase profiles are calculated by transforming time-series data into spectral data. The continuous wavelet transform (CWT) is well known as a new method of time-frequency analysis instead of the short-time Fourier transform. The CWT is superior in processing non-stationary wideband signals like the MT signal by adjusting the size of the wavelet according to the value of frequency. However, the calculation settings of the CWT, such as the type of basis function and the wavelet parameter, are often determined empirically because of the arbitrariness of the shape of the wavelet. Although there might be differences between the calculated MT responses and the true responses due to improper settings of the CWT, there are no detailed studies considering the effect of numerical errors derived from spectral transforms on MT data. In this study, focusing on the frequency band between 0.001 Hz and 1 Hz, we examined the optimum calculation settings of the CWT in processing MT data in terms of suppressing the numerical errors caused by the spectral transform of time-series data. First, we investigated the effect of change in the resolutions of time and frequency on the apparent resistivity and phase profiles by altering the shape of the wavelet. Next, we examined the type of basis function and the range of the wavelet parameter which would provide high-quality MT responses with high continuity that may accurately reflect the subsurface information. Through these experiments, this study proposed the complex Morlet function including a sine wave component with its wavelet parameter k set to 6 ≤ k < 10 as the optimum calculation settings of the CWT. We also show the validity of the proposed calculation settings by applying the CWT to MT survey data of different types. Superiority of the CWT with proposed settings is suggested especially when the signal-to-noise ratio of observed data is low. Consequently, the proposed calculation settings were confirmed to strike a balance between the resolutions of the time and frequency domains well and will therefore be effective in obtaining reliable MT responses.

    DOI

  • Three lines of evidence: Using geophysical approaches, geochemical approaches, and visual observation to assess potential leakage of mine water from tailing storage facility of a gold mine in Thailand

    Tanapon Phenrat*, Yuji Mitsuhata, Takumi Ueda, Yoshishige Kawabe, Yoshiaki Karino, Hideyuki Sato, Warakorn Maneechuket, Thitiporn Pladboon, Sirinart Laoharojanaphand, Kiattipong Khamdee

    Symposium on the Application of Geophysics to Engineering and Environmental Problems 2021    2021.06

    DOI

  • Review of geophysical exploration methods using unmanned aerial vehicles (UAV)

    Ueda Takumi, Mitsuhata Yuji, Okuma Shigeo

    BUTSURI-TANSA(Geophysical Exploration)   74   93 - 114  2021

     View Summary

    In the field of exploration geophysics, as in many other fields, there has been a growing interest in unmanned (autonomous) or manned remotely piloted aircraft, ground vehicles, and underwater vehicles (so-called drones). This manuscript, we focus on small unmanned aerial vehicles (UAVs) and introduce the history and classification of UAVs and their use in the research and development of geophysical exploration methods, including on seismic, radioactive, ground-penetrating radar (GPR) surveys and especially magnetic and electromagnetic methods. In the fields of magnetic and electromagnetic surveys, research and development of "new" exploration methods such as "UAV (drone) magnetic" and "UAV electromagnetic (EM)" methods are rapidly progressing, exploiting the mobility and portability of small UAVs. The magnetic field sensors (magnetometers) used in magnetic exploration, which is a passive exploration method, are classified into two types: vector type and scalar type—and examples of some applications of UAV magnetic exploration are introduced. Since there are both active and passive measurements in UAV EM exploration, the research, development, and applications of UAV EM methods are explained by dividing them into four categories according to the types of transmitter and receiver. Through these reviews, we can find that in geophysical surveys using small UAVs, the weight limit of the onboard measurement device affects the accuracy of the observed data and the depth of investigation. In addition, battery capacity is a constraint on flight time, distance, and exploration efficiency. When using the multicopter type UAVs, we need to consider the electromagnetic noise generated by the rotor drive and the oscillating noise due to flights with loading and suspending the survey instruments. Skilled pilots and ground engineers are also essential for safe and efficient exploration. UAVs can fly more flexibly than manned flights, thereby increasing the possibility of high horizontal resolution and data acquisition along the terrain. UAVs are also extremely advantageous in terms of the safety of workers against hazards such as natural disasters and exposure to radioactive and toxic substances. The possibility of exploration in steep terrains, wetlands, and environmental conservation areas, where manned exploration is difficult, will be investigated. For this purpose, it is important to make the geophysical survey technology not only smaller and more accurate but also more power-efficient. With the acquisition of large amounts of data, it is necessary to develop software for rapid processing, visualization, and inverse analysis of data including depth information. In this context, UAV geophysical survey technology is expected to become the new standard geophysical exploration method in the future.

    DOI CiNii

  • Development of a multi-coil electromagnetic exploration system using an unmanned ground vehicle

    Satake Kai, Ide Kento, Manzawa Karin, Ueda Takumi, Jinguuji Motoharu, Yokota Toshiyuki, Komori Shogo

    BUTSURI-TANSA(Geophysical Exploration)   74   151 - 161  2021

     View Summary

    In recent years, several types of drones such as unmanned aerial vehicles (UAV) and unmanned ground vehicles (UGV) have been developed, researched, and applied in various fields. This technology may be especially useful for the investigation of shallow subsurface problems at depths of meters to dozens of meters below the surface, which are of concern in fields such as infrastructure maintenance, environmental geology, and civil engineering. In particular, the demand for shallow subsurface exploration over a wide area and along a lengthy survey line without the need to dig up the ground is rapidly increasing. In response to these needs, we have begun to develop a new UGV electromagnetic (EM) exploration system (UGVEM system), which consists of a single-frequency multi-coil electromagnetic probe and UGV. In this study, we first conducted basic experiments at a test site to verify whether it would be feasible to use the new system designed from both a UGV and EM instruments. Then, to further evaluate the feasibility and effectiveness of our system, field experiments were conducted along part of the Miyato River-bank in Kuno, Koga City, Ibaraki Prefecture, Japan. According to the data acquired from field experiments with our new system and apparent resistivity cross-sections generated by the observed data, we were able to conclude that the developed system can be applied for efficient field explorations of shallow subsurface geo-electrical structures.

    DOI CiNii

  • Development of a drone-borne electromagnetic survey system for searching for buried vehicles and soil resistivity mapping

    Yuji Mitsuhata, Takumi Ueda, Akiya Kamimura, Shin Kato, Atsushi Takeuchi, Chikara Aduma, Toshiyuki Yokota

    Near Surface Geophysics   20 ( 1 ) 16 - 29  2021

     View Summary

    We developed a drone-borne electromagnetic survey system using a commercial multi-frequency electromagnetic sensor equipped with a GPS receiver, a WiFi serial transceiver, and an ultrasonic distance sensor to measure the height of the electromagnetic sensor above the ground surface. The electromagnetic sensor was suspended from a drone with ropes. The distance between the drone and the electromagnetic sensor was adjusted to minimize the influence of electromagnetic noise generated by the drone, and to stabilize the electromagnetic sensor during flight. The system was tested at two experimental sites. The first site consisted of two buried vehicles to simulate a landslide. We assumed a scenario in which the search for the buried vehicles was urgent and accessibility to the area was limited. The second site consisted of wet and dry agricultural fields to test resistivity mapping. In the first test, we used the in-phase component of the measured data to locate the vehicles. The shallower vehicle was identified clearly, while the deeper vehicle was located successfully, albeit less easily. In the second test, the quadrature component was used for one-dimensional inversion after data processing, which included data smoothing, resampling and bias noise correction. The bias noise was measured while hovering the drone at a high altitude to negate the influence of ground conductivity. The results showed that the resistivity distributions could be mapped at some depths by using a five-frequency-processed quadrature component, and clearly showed the difference between the wet and dry fields. The crucial parameter in the evaluations of these targets was the height of the electromagnetic sensor above the ground surface, which was measured continuously during flight. The results demonstrated the potential of the survey system to search for buried metal objects and for shallow subsurface resistivity mapping over relatively large areas.

    DOI

    Scopus

    3
    Citation
    (Scopus)
  • Petrophysical measurement for data interpretation of magnetic survey – an example of the Musadake geothermal area, Hokkaido, Japan –

    Sugino Yoshiki, Ueda Takumi, Okuma Shigeo, Ishizuka Yoshihiro, Miyakawa Ayumu

    BUTSURI-TANSA(Geophysical Exploration)   73   117 - 122  2020

     View Summary

    Petrophysical data, including magnetic properties of rocks are very effective for interpreting results of magnetic surveys. However, details of rock magnetic properties have been examined rarely in parallel with magnetic survey data. Whereas, apparent magnetic lows are observed in the Musadake geothermal area, eastern Hokkaido by a recent high-resolution aeromagnetic survey of JOGMEC to estimate geothermal potential of the area. In this study, we have made laboratory measurements of density, magnetic susceptibility and natural remanent magnetization (NRM) of rock samples from outcrops in the area to evaluate its application to an interpretation of the magnetic anomalies.

    Block samples had been collected from three outcrops: the right bank of the Ikeshomanai River (Site A), the Shura River (Site B), and the right bank of Kutekunbetsu River (Site C) and had been shaped into cylindrical specimens. All the specimens from the Site B and some specimens from the Site C indicate high NRM intensities (≥ 1.0 A/m) with high Qn ratios (≥ 1.0) and negative NRM inclinations. Whereas, all the specimens from the Site A and some specimens from the Site C show low NRM intensities (≤ 1.0 A/m) with low Qn ratios (≤ 1.0) and positive NRM inclinations.

    AC demagnetization experiments were also conducted for selected specimens from the three outcrops and all the selected specimens were found to show negative NRM inclination, suggesting its reverse magnetization as the initial magnetization. This result is consistent with the obvious low magnetic anomalies observed over the rock sampling sites and our results imply that the low magnetic anomalies are not attributed to geothermal signs, but rather to the distribution of reversely magnetized volcanic rocks. According to photomicrograph and X-ray fluorescence analyses conducted additionally, the rock sample from the Site A is seen to lack opaque minerals by alteration, causing its low magnetic properties.

    On a basis of good agreements between the petrophysical property and magnetic anomaly, it is concluded that examinations of petrophysical properties of rocks are useful when interpreting magnetic survey results in the study area.

    DOI CiNii

  • Three-dimensional electromagnetic holographic imaging in active monitoring of sea-bottom geoelectrical structures

    Michael S. Zhdanov, Martin Ćuma, Takumi Ueda

    Active Geophysical Monitoring     269 - 294  2020

     View Summary

    We consider an application of the ideas of electromagnetic (EM) holography/migration to the interpretation of a typical marine controlled-source EM (MCSEM) survey, which consists of a set of sea-bottom receivers and a moving electrical bipole transmitter. The three-dimensional interpretation of MCSEM data is a very challenging problem because of the enormous amount of computations required in the case of the multitransmitter and multireceiver data acquisition systems used in these surveys. At the same time, we show that the MCSEM surveys with their dense system of transmitters and receivers are extremely well suited for application of the holography/migration method. The combined EM signal in the receivers forms a broadband EM “hologram” of the sea-bottom geological target. As in optical and radiowave holography, we can reconstruct the volume image of the geological target by “illuminating” this EM hologram with the reference signal. The principles of holography/migration imaging formulated in this chapter are tested on typical models of a sea-bottom petroleum reservoir. We also apply this new technique to the interpretation of an MCSEM survey conducted in the Troll West gas province, offshore from Norway.

    DOI

  • Petrophysical measurement for data interpretation of magnetic survey - an example of the Musadake geothermal area, Hokkaido, Japan -

    杉野由樹, 上田匠, 大熊茂雄, 石塚吉浩, 宮川歩夢

    物理探査(Web)   73  2020

    J-GLOBAL

  • Iterative migration in marine CSEM data interpretation

    Michael S. Zhdanov, Takumi Ueda, Alexander Gribenko

    Society of Exploration Geophysicists - SEG International Exposition and 76tth Annual Meeting 2006, SEG 2006     810 - 814  2018

     View Summary

    In this paper we consider an application of the ideas of electromagnetic (EM) migration to the interpretation of a typical marine controlled-source (MCSEM) survey, which consists of a set of sea-bottom receivers and a moving electrical bipole transmitter. The 3-D interpretation of the MCSEM data is a very challenging problem because of the enormous amount of computations required in the case of the multi-transmitter and multi-receiver data acquisition systems used in these surveys. At the same time, we show that the MCSEM surveys with their dense system of transmitters and receivers happen to be extremely well suited for application of the migration method. In order to speed up the computation of the migration field, we apply a fast form of integral equation (IE) solution based on the multigrid quasi-linear (MGQL) approximation. The principles of the migration imaging formulated in this paper are tested on a typical model of a sea-bottom petroleum reservoir.

  • Sub-seafloor resistivity sensing using a vertical electrode configuration

    Takumi Ueda, Yuji Mitsuhata, Motoharu Jinguji, Hisatoshi Baba

    EARTH PLANETS AND SPACE   66 ( 1 )  2014.05  [Refereed]

    Authorship:Lead author, Corresponding author

     View Summary

    There is growing interest in marine direct current (DC) resistivity methods for sub-seafloor exploration of a broad range of geophysical and geological targets. To address this, we have developed a new marine DC method with a vertical electrode configuration (VEC). Compared to conventional marine DC methods that use a horizontal electrode configuration, the shape and position of our VEC cable can be controlled relatively easily. Therefore, the VEC is suitable for operations in regions of steep bathymetry and for expeditious sub-seafloor resistivity exploration. In this study, we introduce a water-resistant electrode array cable and an onshore multichannel DC measurement system for stable and rapid data acquisition. To evaluate the performance and efficiency of the new system, we conducted field experiments in the shallow water zone at Shimizu Port, Suruga Bay, Japan. In order to quantitatively analyze the VEC-DC data, we adopt a 1-D numerical modeling code that computes the electric potential and apparent resistivity generated by a point and dipole current source used in the VEC-DC measurement. These can be placed at any position with an arbitrary electrode configuration in a multilayered space, including seawater and sub-seafloor layers. We also develop an inversion code for the VEC-DC data based on a simulated annealing (SA) optimization and applied this to the field data. The observed data is of sufficiently good quality to be used for inversion, and the SA result demonstrates that the proposed VEC-DC system is able to estimate the sub-seafloor resistivity structure.

    DOI

    Scopus

  • A new marine magnetotelluric measurement system in a shallow-water environment for hydrogeological study

    Takumi Ueda, Yuji Mitsuhata, Toshihiro Uchida, Atsunao Marui, Kenji Ohsawa

    JOURNAL OF APPLIED GEOPHYSICS   100   23 - 31  2014.01  [Refereed]

    Authorship:Lead author, Corresponding author

     View Summary

    We have developed a new marine magnetotelluric (MT) measurement system that can reduce noises caused by sea wave motions and can be applied to measurements under very shallow seawater areas, such as a coastal region with a sea depth of 10 to 100 m. The difficulties of geophysical exploration in shallow water and coastal areas include (1) fishery activity, (2) limitations of survey vessel size, and (3) motion noise caused by sea waves. In order to overcome these difficulties, we selected a MT method that uses natural EM fields without transmitting an electric current in seawater, which enables the method to be used in areas with active inshore fisheries. In addition, the developed marine MT system is very short, which reduces motion generated by sea waves, and compact, which enables light-draft small survey boat operation. We conducted offshore data acquisition using a new MT measurement system and an onshore MT survey at the Horonobe coastal area, Hokkaido, Japan. High-quality data were successfully obtained in both onshore and offshore field surveys. Two-dimensional (2D) inversion for field data from onshore to sea bottom reveals that a quaternary sedimentary layer of a few hundred meters in thickness, which was determined by well logging to be a freshwater layer, extends horizontally offshore for several kilometers under the sea. The results obtained herein demonstrate that the newly developed marine MT measurement system can be used to clarify the geoelectrical structures of brackish/fresh groundwater distributions and in coastal areas. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.

    DOI

    Scopus

    17
    Citation
    (Scopus)
  • Seismic reflection surveys at Horonobe coastal land area

    横田俊之, 稲崎富士, 溝畑茂治, 内田利弘, 上田匠

    物理探査   65 ( 3 )  2012

    J-GLOBAL

  • Direct current electric potentials for a multilayered earth with arbitrary electrode configurations-Derivation of theoretical recurrence formulas for a point current source excitation-

    光畑裕司, 上田匠

    物理探査   63 ( 2 )  2010

    J-GLOBAL

  • Direct current electric potentials for a multilayered earth with arbitrary electrode configurations-Numerical methods and simulation of marine resistivity exploration-

    上田匠, 光畑裕司, 内田利弘

    物理探査   63 ( 3 )  2010

    J-GLOBAL

  • 3D electromagnetic holographic imaging in active monitoring of sea-bottom geoelectrical structures

    Michael S. Zhdanov, Martin Cuma, Takumi Ueda

    Handbook of Geophysical Exploration: Seismic Exploration   40 ( C ) 325 - 350  2010  [Refereed]

    DOI J-GLOBAL

    Scopus

    1
    Citation
    (Scopus)
  • A 3D ground penetrating radar imaging of the heavy rainfall-induced deformation around a river levee: A case study of Ara River, Saitama, Japan

    Toshiyuki Yokota, Tomio Inazaki, Shunsuke Shinagawa, Takumi Ueda

    Exploration Geophysics   40 ( 1 ) 49 - 55  2009

     View Summary

    This paper describes a three-dimensional ground penetrating radar (GPR) survey carried out around a levee of the Ara River in Saitama, Japan, where deformation of the ground was observed after heavy rainfall associated with the typhoon of September 2007. The high-density 3D GPR survey was conducted as a series of closely adjacent four directional sets of 2D surveys at an area surrounding vertical cracks on the paved road caused by deformations induced by heavy rain. The survey directions of the 2D surveys were 0, 90, 45, and 45 degrees with respect to the paved road and the intervals between lines were less than 0.5m. The 3D subsurface structure was accurately imaged by the result of data processing using Kirchhoff-type 3D migration. As a result, locations and vertical continuities of the heavy rainfall induced cracks in the paved road were clearly imaged. This will be a great help in considering the generation mechanisms of the cracks. Moreover, the current risk of a secondary disaster was found to be low, as no air-filled cavities were detected by the 3D GPR survey. © ASEG/SEGJ/KSEG 2009.

    DOI

    Scopus

    1
    Citation
    (Scopus)
  • 3D finite difference forward modeling of magnetoterrulic method using the library of iterative solvers for linear systems, Lis

    上田匠, 内田利弘

    日本計算工学会論文集(Web)   2009   20090019 - 20090019  2009

     View Summary

    The purpose of this research was to establish a three-dimensional (3D) numerical modeling method for electromagnetic (EM) exploration problems, such as the magnetotelluric (MT) method, and to determine the iterative solver and preconditioner suitable for a system of linear equations of the 3D EM modeling. We developed a new numerical calculation code for solving Maxwell's equations based on EM potentials by a finite difference method incorporating the Lis (Library of iterative solvers for linear systems). The accuracy of the developed code was confirmed by comparing its results with those of the integral equation method using two synthetic geoelectrical models, which are typical for electromagnetic exploration. Thereafter, we used various Lis'iterative solvers and preconditioners to solve the system of linear equations. Calculation results indicate that a combination of FGMRES and ILU(0) is the best for the 3D finite difference modeling of the MT method.

    DOI CiNii J-GLOBAL

  • Marine CSEM inversion based on the regularized conjugate gradient method and EM migration

    上田匠, ZHDANOV Michael S.

    物理探査   62 ( 3 ) 295 - 306  2009

     View Summary

    In this paper, we describe an application of the Tikhonov regularization and electromagnetic (EM) migration to an inverse problem of a typical marine controlled-source EM (MCSEM) method used for offshore hydrocarbon exploration.<br>  The 3-D modeling and inversion of MCSEM data is a very challenging problem because of the number of computations required in the case of the multi-transmitter and multi-receiver data acquisition systems used in these surveys.<br>  To overcome this difficulty, we apply Tikhonov regularized inversion along with the Jacobian matrix computed using the principles of EM migration. In order to obtain a stable solution, we use the conjugate gradient method to solve the iterative regularized inversion. The multigrid quasi-linear approximation developed by Ueda and Zhdanov (2006) is introduced for accelerating the computation, in the forward stage of the iterative inversion.<br>  The developed methods are tested on synthetic examples of 3-D MCSEM inversion for the model with the resistive anomaly embedded in the conductive sediment; we have found that the methods can be applied effectively to the interpretation of MCSEM data.<br>

    DOI CiNii J-GLOBAL

  • Fast numerical methods for marine controlled-source electromagnetic (EM) survey data based on multigrid quasi-linear approximation and iterative EM migration

    Takumi Ueda, Michael S. Zhdanov

    EXPLORATION GEOPHYSICS   39 ( 1 ) 60 - 67  2008.03

    Authorship:Lead author

     View Summary

    In this paper we consider an application of the method of electromagnetic ( EM) migration to the interpretation of a typical marine controlled-source (MCSEM) survey consisting of a set of sea-bottom receivers and a moving electrical bipole transmitter. Three-dimensional interpretation of MCSEM data is a very challenging problem because of the enormous number of computations required in the case of the multi-transmitter and multi-receiver data acquisition systems used in these surveys. At the same time, we demonstrate that the MCSEM surveys with their dense system of transmitters and receivers are extremely well suited for application of the migration method. In order to speed up the computation of the migration field, we apply a fast form of integral equation (IE) solution based on the multigrid quasi-linear (MGQL) approximation which we have developed. The principles of migration imaging formulated in this paper are tested on a typical model of a sea-bottom petroleum reservoir.

    DOI

    Scopus

    10
    Citation
    (Scopus)
  • Three-dimensional interpretation of the marine CSEM data using joint iterative migration of electric and magnetic fields

    M. S. Zhdanov, T. Ueda

    69th European Association of Geoscientists and Engineers Conference and Exhibition 2007: Securing The Future. Incorporating SPE EUROPEC 2007   1   542 - 546  2007

     View Summary

    Marine controlled-source electromagnetic (MCSEM) surveys have become widely used in off-shore petroleum exploration. However, the interpretation of the MCSEM data is a very challenging problem because of the enormous amount of computations required in the case of the multi-transmitter and multi-receiver data acquisition systems used in these surveys. In this paper we demonstrate that this problem can be solved using the method of electromagnetic migration. We extend the basic principles of electric field migration for the case of joint electric and magnetic field interpretation. A joint migration field is produced by back propagation within the conductive sea-bottom sediments of all electric and magnetic signals recorded in the receivers. We demonstrate that the joint migration of the EM field data provides a better quality image of the sea-bottom resistive structure (e.g., hydrocarbon reservoir) than the results of individual migration for the different (electric or magnetic) field components.

  • Joint iterative migration of electric and magnetic field data

    Michael S. Zhdanov, Takumi Ueda

    Society of Exploration Geophysicists - 77th SEG International Exposition and Annual Meeting, SEG 2007   26 ( 1 ) 599 - 603  2007

     View Summary

    Marine controlled-source electromagnetic (MCSEM) surveys become widely used in off-shore petroleum exploration. However, the interpretation of the MCSEM data is a very challenging problem because of the enormous amount of computations required in the case of the multi-transmitter and multi-receiver data acquisition systems used in these surveys. In this paper we demonstrate that this problem can be solved using the method of electromagnetic migration. We extend the basic principles of electric field migration to the case of joint electric and magnetic field interpretation. The joint migration field is produced by back propagation within the conductive sea-bottom sediments of all electric and magnetic signals recorded in the receivers. We demonstrate that the joint migration of the EM field data provides a better quality image of a sea-bottom resistive structure (e.g., a hydrocarbon reservoir) than the results of individual migration for the different (electric or magnetic) field components.

    DOI

    Scopus

    1
    Citation
    (Scopus)
  • Sharp boundary inversion in crosswell travel-time tomography

    M. S. Zhdanov, G. Vignoli, T. Ueda

    JOURNAL OF GEOPHYSICS AND ENGINEERING   3 ( 2 ) 122 - 134  2006.06

     View Summary

    The reconstruction of seismic images of the medium from crosswell travel-time data is a typical example of the ill-posed inverse problem. In order to obtain a stable solution and to replace an ill-posed problem by a well-posed one, a stabilizing functional ( stabilizer) has to be introduced. The role of this functional is to select the desired stable solution from a class of solutions with specific physical and/or geometrical properties. One of these properties is the existence of sharp boundaries separating rocks with different petrophysical parameters, e. g., oil- and water-saturated reservoirs. In this paper, we develop a new tomographic method based on application of a minimum support stabilizer to the crosswell travel-time inverse problem. This stabilizer makes it possible to produce clear and focused images of geological targets with sharp boundaries. We demonstrate that the minimum support stabilizer allows a correct recovery of not only the shape but also the velocity value of the target. We also point out that this stabilizer provides good results even with a low ray density, when the traditional minimum norm stabilizer fails.

    DOI

    Scopus

    39
    Citation
    (Scopus)
  • Fast numerical modeling of multitransmitter electromagnetic data using multigrid quasi-linear approximation

    Takumi Ueda, Michael S. Zhdanov

    IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING   44 ( 6 ) 1428 - 1434  2006.06

     View Summary

    Multitransmitter electromagnetic (EM) surveys are widely used in remote-sensing and geophysical exploration. The interpretation of the multitransmitter geophysical data requires numerous three-dimensional (3-D) modelings of the responses of the receivers for different geoelectrical models of complex geological formations. In this paper, we introduce a fast method for 3-D modeling of EM data, based on a modified version of quasilinear approximation, which uses a multigrid approach. This method significantly speeds up the modeling of multitransmitter-multireceiver surveys. The developed algorithm has been applied for the interpretation of marine controlled-source electromagnetic (MCSEM) data. We have tested our new method using synthetic problems and for the simulation of MCSEM data for a geoelectrical model of a Gemini salt body.

    DOI CiNii

    Scopus

    33
    Citation
    (Scopus)
  • Iterative migration in marine CSEM data interpretation

    Michael S. Zhdanov, Takumi Ueda, Alexander Gribenko

    SEG Technical Program Expanded Abstracts   25 ( 1 ) 810 - 814  2006.01

     View Summary

    In this paper we consider an application of the ideas of electromagnetic (EM) migration to the interpretation of a typical marine controlled-source (MCSEM) survey, which consists of a set of sea-bottom receivers and a moving electrical bipole transmitter. The 3-D interpretation of the MCSEM data is a very challenging problem because of the enormous amount of computations required in the case of the multi-transmitter and multi-receiver data acquisition systems used in these surveys. At the same time, we show that the MCSEM surveys with their dense system of transmitters and receivers happen to be extremely well suited for application of the migration method. In order to speed up the computation of the migration field, we apply a fast form of integral equation (IE) solution based on the multigrid quasi-linear (MGQL) approximation. The principles of the migration imaging formulated in this paper are tested on a typical model of a sea-bottom petroleum reservoir. © 2005 Society of Exploration Geophysicists.

    DOI

    Scopus

    2
    Citation
    (Scopus)
  • Fast numerical modeling of marine controlled-source electromagnetic data using quasi-linear approximation

    Takumi Ueda, Michael S. Zhdanov

    Society of Exploration Geophysicists - 75th SEG International Exposition and Annual Meeting, SEG 2005     506 - 509  2005

     View Summary

    We developed a fast method for 3-D modeling of marine controlled-source electromagnetic (MCSEM) data in seabed logging (SBL) applications. This method is based on a modified version of quasi-linear (QL) approximation, which speeds up significantly modeling of multitransmitter-multireceiver surveys. The developed code has been tested using synthetic problems and for simulation of MCSEM data for a geoelectrical model of a Gemini salt body.

    DOI

    Scopus

    6
    Citation
    (Scopus)

▼display all

Misc

  • Juliaによる坑井間初動走時トモグラフィの解析プログラムの開発及びCCSモニタリングへの適用—Development of numerical methods for cross-well travel-time tomography by Julia and its application to CCS monitoring

    上村 建人, 上田 匠, 児玉 匡史, 横田 俊之

    公益社団法人物理探査学会学術講演会講演論文集 = Proceedings of the SEGJ Conference   148   109 - 112  2023

  • 深層学習を用いた時間領域空中電磁探査データの逆解析—Deep Learning Inversion for Airborne Time Domain Electromagnetic data

    橘川 萩, 中西 賢吾, 西野 玉城, 上田 匠

    公益社団法人物理探査学会学術講演会講演論文集 = Proceedings of the SEGJ Conference   148   83 - 86  2023

  • ドローン時間領域空中電磁探査法における数値計算を用いた送受信配置の検討—Determination of Optimal Transmitter and Receiver Configuration for Time-Domain Airborne Electromagnetic Survey Using UAVs

    桑井 康行, 上田 匠

    公益社団法人物理探査学会学術講演会講演論文集 = Proceedings of the SEGJ Conference   148   66 - 69  2023

  • 接地電線信号源を用いた電磁探査法の応答計算と特性の検討—Calculation and Characterisation of Electromagnetic Fields Generated by Grounded-Wire Source

    劉 昊然, 上田 匠

    公益社団法人物理探査学会学術講演会講演論文集 = Proceedings of the SEGJ Conference   148   79 - 82  2023

  • Pythonを用いた水平多層構造・3D任意電極配置に対応した電位応答解析手法—Numerical Methods for Layered Earth Electric Potential with 3D Electrode Configuration using Python

    與田 至門, 上田 匠, 上原 大二郎, 王寺 秀介

    公益社団法人物理探査学会学術講演会講演論文集 = Proceedings of the SEGJ Conference   146   19 - 22  2022

  • 水平拘束を用いたTikhonov正則化共役勾配法による仙台平野南部沿岸域におけるTDEM法データの逆解析—1D Layered Tikhonov Regularized Conjugate Gradient Inversion and Application of Horizontal Constraint for Onshore TDEM Data observed at Southern Sendai Plane Coastal Region

    中村 圭佑, 上田 匠, 大熊 茂雄

    公益社団法人物理探査学会学術講演会講演論文集 = Proceedings of the SEGJ Conference   146   54 - 57  2022

  • 電気探査IP法における黄鉄鉱の電気化学的研究—Study on the electrochemical properties of pyrite showing induced polarization (IP) effect

    菱田 元, 高倉 伸一, 上田 匠

    公益社団法人物理探査学会学術講演会講演論文集 = Proceedings of the SEGJ Conference   147   197 - 200  2022

  • UGVを用いたマルチコイル型電磁探査システムの基礎研究—Fundamental study of a multi-coil electromagnetic exploration system using an unmanned ground vehicle

    佐竹 海, 井手 健斗, 万沢 かりん, 上田 匠, 神宮司 元治, 横田 俊之, 小森 省吾

    公益社団法人物理探査学会学術講演会講演論文集 = Proceedings of the SEGJ Conference   145   55 - 58  2021

    CiNii

  • Development of electromagnetic response calculation program in horizontally layered earth with arbitrary transmitter/receiver deployment and transmitting current waveform.

    桑井康行, 河合将人, 宅間晴史, 岡田拓己, 上田匠, 中島崇裕

    物理探査学会学術講演会講演論文集   144th  2021

    J-GLOBAL

  • 1D deep learning inversion of frequency domain airborne electromagnetic method

    松本侑也, 上田匠

    物理探査学会学術講演会講演論文集   144th  2021

    J-GLOBAL

  • Measurement of rock properties for gravity and magnetic data analysis-an example of Musadake area, Hokkaido, Japan-

    杉野由樹, 杉野由樹, 上田匠, 大熊茂雄

    物理探査学会学術講演会講演論文集   141st  2019

    J-GLOBAL

  • A case study of the corrosion risk of industrial water pipeline by investigation of soil using high-frequency AC resistivity measurement

    万沢かりん, 上田匠, 神宮司元治, 横田俊之

    物理探査学会学術講演会講演論文集   140th   11 - 14  2019

    CiNii J-GLOBAL

  • Data generation by FDTD Method simulator and their availability for deep learning in the Ground Penetrating Radar Method

    山下奨平, 磯真一郎, 上田匠

    物理探査学会学術講演会講演論文集   140th  2019

    J-GLOBAL

  • Development of 1D forward modeling for electromagnetic method with Python

    松本侑也, 上田匠

    物理探査学会学術講演会講演論文集   140th  2019

    J-GLOBAL

  • Characteristics of frequency domain electromagnetic survey data using an unmanned ground vehicle

    佐竹海, 万沢かりん, 上田匠, 神宮司元治, 横田俊之, 小森省吾

    物理探査学会学術講演会講演論文集   140th   195 - 198  2019

    CiNii J-GLOBAL

  • Development of drone-assisted electromagnetic prospecting system for automobiles buried by landslides

    Y. Mitsuhata, T. Ueda, A. Kamimura, S. Kato, A. Takeuchi, C. Aduma

    24th European Meeting of Environmental and Engineering Geophysics    2018.09

     View Summary

    We have developed an electromagnetic prospecting system using a drone for searching for automobiles buried by a landslide. The system consists of an drone, an 1.6 m long electromagnetic (EM) sensor with a GPS receiver, an ultrasonic distance sensor for monitoring the height of EM sensor from the ground surface and a WiFi serial transceiver for controlling the EM sensor and monitoring the measured data. The drone suspends the EM sensor and EM data are acquired during the flight. The distance of drone-sensor separation is crucial to avoid EM noise caused from the drone motors and to stabilize the flight of drone On the basis of field experiments, we adopted a separation of 4 m and attached a vertical tail to the aft end of EM sensor witch can stabilize the flight at a speed of at least 2 m/s. The height of EM sensor should be monitored because it affects the EM data significantly. We have tested the system at an experiment site where there are two cars embedded at depths of 1.5 m and 3 m respectively. The close-area search clearly indicated the location of the shallow car, and there was a slight indication of the deep car.

    DOI

  • 小型無人航空機(UAV/ドローン)による周波数領域電磁探査法の開発

    上田匠, 上田匠, 光畑裕司, 加藤晋, 神村明哉, 谷村和彦, 伊豆智幸, 植田大造, 藤井純一郎

    物理探査学会学術講演会講演論文集   136th  2017

    J-GLOBAL

  • 小型無人航空機(UAV/ドローン)を用いた周波数領域空中電磁探査法システムの開発

    上田匠, 光畑裕司, 加藤晋, 神村明哉, 谷村和彦, 伊豆智幸, 植田大造, 藤井純一郎

    日本地球惑星科学連合大会予稿集(Web)   2017  2017

    J-GLOBAL

  • 災害調査用地上/空中複合型ロボットシステムの開発

    加藤晋, 神村明哉, 光畑裕司, 上田匠, 渡辺顕司, 有隅仁, 皿田滋, 竹内厚司, 東千加良, 野宮和洋, 鎌田瑞生, 鎌田瑞生, 伊豆智幸, 斉藤昇, 丸山賢太郎, 後藤宏二, 植田大造, 藤井純一郎, 藤田将史, 谷村和彦

    日本ロボット学会学術講演会予稿集(CD-ROM)   34th  2016

    J-GLOBAL

  • 秋田県小坂地域でのSIP法実証試験

    高倉伸一, 上田匠, 光畑裕司, 杉崎真幸, 本居正幸

    物理探査学会学術講演会講演論文集   132nd  2015

    J-GLOBAL

  • 海洋電磁探査による上越沖表層メタンハイドレート分布調査

    光畑裕司, 上田匠, 森田澄人, 棚橋学

    日本地球惑星科学連合大会予稿集(Web)   2015  2015

    J-GLOBAL

  • 仙台平野南部太平洋沿岸地域における電気・電磁探査法調査

    上田匠, 大熊茂雄, 神宮司元治, 井川怜欧, 光畑裕司, 内田利弘, 丸井敦尚, 石川秀浩

    物理探査学会学術講演会講演論文集   130th  2014

    J-GLOBAL

  • 鉛直型電極配置による海底電気探査法の開発

    上田匠, 神宮司元治, 光畑裕司, 馬塲久紀

    物理探査学会学術講演会講演論文集   128th  2013

    J-GLOBAL

  • Development of shallow seafloor EM survey system and its application at Horonobe coastal area

    UEDA Takumi, UCHIDA Toshihiro, MITSUHATA Yuji, SATO Tatsuya, OSAWA Kenji, SABA Mizue

      124   239 - 242  2011.05

    CiNii

  • 2D interpretation of land and seafloor magnetotelluric data at the Horonobe coastal area

    UCHIDA Toshihiro, UEDA Takumi, MITSUHATA Yuji, YOKOTA Toshiyuki

      124   235 - 238  2011.05

    CiNii

  • 福島県いわき市での緊急災害調査-CSAMT法による湯ノ岳・藤原断層近傍の地下構造-

    鈴木浩一, 内田利弘, 相澤隆生, 狩野嘉昭, 佐々木吾郎, 田上正義, 窪田健二, 上田匠, 真田佳典, 内田真人, 鈴木敬一, 岸本宗丸, 濱友紀, 谷口友規

    物理探査学会学術講演会講演論文集   125th  2011

    J-GLOBAL

  • 幌延沿岸域における反射法地震探査

    横田俊之, 稲崎富士, 溝畑茂治, 内田利弘, 上田匠

    物理探査学会学術講演会講演論文集   122nd  2010

    J-GLOBAL

  • 沿岸域MT法における2次元解析の検討と幌延沿岸域データへの適用

    上田匠, 内田利弘, 光畑裕司

    物理探査学会学術講演会講演論文集   122nd   275 - 278  2010

    CiNii J-GLOBAL

  • 浅海電磁探査システムの改良・動作試験と幌延沿岸域における予備実験

    大澤健二, 光畑裕司, 上田匠, 内田利弘, 佐波瑞恵, 佐藤龍也

    物理探査学会学術講演会講演論文集   122nd  2010

    J-GLOBAL

  • 海底鉱物資源を対象とした接地型電磁探査法の検討

    石川秀浩, 渡辺英久, 光畑裕司, 上田匠, 内田利弘, 馬塲久紀

    物理探査学会学術講演会講演論文集   123rd  2010

    J-GLOBAL

  • 海域・沿岸域における電気探査法適用のための任意配置電極対応1次元数値計算手法

    上田匠, 光畑裕司, 内田利弘

    物理探査学会学術講演会講演論文集   120th   1 - 4  2009

    CiNii J-GLOBAL

  • 電磁マッピング物理探査技術の油汚染土壌調査への適用研究

    光畑裕司, 安藤大, 上田匠, 今里武彦, 高木一成, 佐藤秀之

    地下水・土壌汚染とその防止対策に関する研究集会講演集(CD-ROM)   15th  2009

    J-GLOBAL

  • Fast numerical methods for marine controllen-source electromagnetic (EM) survey data based on multigrid quasi-linear approximation and iterative EM migration

    UEDA Takumi, ZHDANOV Michael S.

    Geophysical exploration   61 ( 1 ) 60 - 67  2008.02

     View Summary

    In this paper we consider an application of the method of electromagnetic (EM) migration to the interpretation of a typical marine controlled-source (MCSEM) survey consisting of a set of sea-bottom receivers and a moving electrical bipole transmitter. Three-dimensional interpretation of MCSEM data is a very challenging problem because of the enormous number of computations required in the case of the multi-transmitter and multi-receiver data acquisition systems used in these surveys. At the same time, we demonstrate that the MCSEM surveys with their dense system of transmitters and receivers are extremely well suited for application of the migration method. In order to speed up the computation of the migration field, we apply a fast form of integral equation (IE) solution based on the multigrid quasi-linear (MGQL) approximation which we have developed. The principles of migration imaging formulated in this paper are tested on a typical model of a sea-bottom petroleum reservoir. © ASEG/SEGJ/KSEG 2008.

    DOI CiNii

  • 三次元地中レーダによる河川堤防周辺の地下水探査-埼玉県荒川における適用例-

    横田俊之, 稲崎富士, 品川俊介, 上田匠

    物理探査学会学術講演会講演論文集   118th  2008

    J-GLOBAL

  • 海洋石油資源探査における人工信号源電磁探査法の概要

    上田匠

    地質ニュース   ( 644 )  2008

    J-GLOBAL

  • 電磁探査法による海底石油ガス資源探査の概要

    上田匠, ZHDANOV Michael S.

    資源・素材   2008 ( A/B/E )  2008

    J-GLOBAL

  • 埼玉県荒川河川堤防周辺の地下水探査-三次元地中レーダを用いた探査例-

    横田俊之, 稲崎富士, 品川俊介, 上田匠, 光畑裕司

    日本地下水学会講演会講演要旨   2008  2008

    J-GLOBAL

  • 海洋および沿岸域における電気・電磁探査法適用に向けた数値モデリング技術の開発

    上田匠, 光畑裕司, 内田利弘

    物理探査学会学術講演会講演論文集   119th   113 - 116  2008

    CiNii J-GLOBAL

  • 幌延沿岸域における物理探査プロジェクトの概要

    内田利弘, 光畑裕司, 上田匠, 安藤誠, 丸井敦尚, 楠瀬勤一郎

    物理探査学会学術講演会講演論文集   118th  2008

    J-GLOBAL

  • Numerical analysis of marine CSEM method (1) : 3D forward modeling based on the integral equation method and linear approximations

    UEDA Takumi, ZHDANOV Michael S.

      116   207 - 210  2007.05

    CiNii J-GLOBAL

  • Overview of numerical analysis of the marine CSEM method (2) : 3D marine CSEM inversion based on the integral equation method

    UEDA Takumi, ZHDANOV Michael S.

      116   211 - 214  2007.05

    CiNii J-GLOBAL

  • 電気 電磁探査法数値計算における Hankel 変換用デジタルフィルタの基礎研究

    上田匠

    CA研究会講演要旨集, 2007     135 - 141  2007

    CiNii

  • A basic study of system of linear equations for electric and electromagnetic numerical analysis

    UEDA Takumi

      117th   309 - 312  2007

    CiNii J-GLOBAL

  • Development of 3-D Finite-Difference Forward Modeling Method Based on Electromagnetic Potentials

    UEDA Takumi, ZHDANOV Michael S.

      110   59 - 62  2004.05

    CiNii

  • Study on the Characteristics of Time-Domain Electromagnetic Responses.

    NOGUCHI Koji, UEDA Takumi, WANG Zhenyang

      104   259 - 263  2001.05

    CiNii

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Research Institute

  • 2022
    -
    2024

    Waseda Research Institute for Science and Engineering   Concurrent Researcher

Internal Special Research Projects

  • ドローンを用いた次世代電磁探査法システムの基礎数値シミュレーション

    2017  

     View Summary

    ドローン(無人小型航空機)を用いた地下探査(電磁探査)手法の開発の一環として、ドローン吊り下げ型電磁探査法の測定データを数値計算により予測・計算するためのプログラムの開発、整備及び基礎的なシミュレーションを実施した。一般的な探査は陸上(地表)に送受信装置を配置して測定を行うため、従来の計算手法ではドローンからの測定を正確に計算できない、あるいは計算可能なプログラムの理論、実装が不明確であるなどの問題があった。本研究で、空中からの電磁場計測を想定した計算プログラムの開発を行い、ドローン電磁探査を想定した予測応答の計算を可能とし、システム開発ための基本となる探査仕様(送受信コイルサイズ、周波数、飛行高度など)の情報を得ることができた。