A5036597341- Seismic Imaging and Inversion Techniques
- Seismic Waves and Analysis
- Methane Hydrates and Related Phenomena
- Geophysical Methods and Applications
- Drilling and Well Engineering
- Hydraulic Fracturing and Reservoir Analysis
- Hydrocarbon exploration and reservoir analysis
- Reservoir Engineering and Simulation Methods
- NMR spectroscopy and applications
- Geophysical and Geoelectrical Methods
- earthquake and tectonic studies
- Underwater Acoustics Research
- Geological and Geophysical Studies
- Seismology and Earthquake Studies
- Cryospheric studies and observations
- Ultrasonics and Acoustic Wave Propagation
- Atmospheric and Environmental Gas Dynamics
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Arctic and Antarctic ice dynamics
- Landslides and related hazards
- Underwater Vehicles and Communication Systems
- Global Energy and Sustainability Research
- Geophysics and Sensor Technology
- Geomagnetism and Paleomagnetism Studies
- Particle Detector Development and Performance
The University of Tokyo
2016-2025
Geological Survey of Japan
2000-2025
National Institute of Advanced Industrial Science and Technology
2003-2025
Tokyo College of Environment
2021
Frontier Energy (United States)
2011-2019
Health Affairs
2017-2018
Khalifa University of Science and Technology
2017
Renesas Electronics (United States)
2016
Graduate School USA
2014-2015
Service de l'Enfance et de la Jeunesse
2008-2010
Previous studies performed in Abu Dhabi oilfields, United Arab Emirates, revealed the direct link of seismic wave attenuation to petrophysical properties rocks. However, all those were based on zero offset VSP data, which limits estimation at one location only. This is due difficulty estimating from 3D especially carbonate To overcome this difficulty, we developed a workflow centroid frequency shift method and Gabor transform optimized by using data. The was applied Ocean Bottom Cable...
Data from two vertical seismic profiles (VSPs) the Nankai Trough exploratory well, offshore Tokai, central Japan, are used to estimate compressional attenuation in methane hydrate (MH)‐bearing sediments at frequencies of 30–110 Hz. We compare spectral ratio and centroid frequency shift methods for measuring attenuation. To isolate intrinsic total attenuation, is computed multiples using one‐dimensional synthetic VSP data sonic density logs. The use different measurement VSPs recorded just...
Summary Seismic wave attenuation has a great potential for studying saturated and fractured media, due to its high sensitivity the physical properties of geological media. However, accurately estimating this parameter can be challenging signal noise, particularly in heterogeneous media such as carbonate rocks. This explains paucity studies carried out rocks compared with sandstones, ambiguity around mechanisms relationship petrophysical properties. To investigate further, we conducted an...
Three-dimensional vertical seismic profiling data acquired from an oilfield located in Abu Dhabi, United Arab Emirates, were used to obtain a high-resolution multioffset azimuthal estimate of compressional wave attenuation. On the basis assumption that fracture strike corresponds direction [Formula: see text] at which attenuation is minimized, orientations obtained three reservoir units. Two approaches determine text]: first variation absolute with azimuth and second relative azimuth. The...
Seismic attenuation was estimated from compressional (P) and shear (S) waves carefully extracted three-component vertical seismic profiling (VSP) data. A high sensitivity of to fluid content noticed, which shows the advantage its use as a attribute for reservoir studies. Contrary most observations in fully saturated sandstones, magnitude P S wave studied carbonate zones is higher than one. This disagreement probably because flow models developed describe mechanisms sandstones are not valid...
Obtaining information on the occurrence, distribution, and in-situ concentration of methane hydrate is required for evaluation resource potential hydrate. The primary source marine methane-hydrate occurrence comes from seismic data that have been calibrated with local downhole well-log core data. Widespread distributions bottom-simulating reflectors (BSRs) are known in Nankai Trough area offshore central Japan collected oil gas exploration purposes. Since first wells drilled 1999, systematic...
The presence of partially frozen liquid in the pore spaces porous materials has significant effects on elastic wave propagation. Although characterization systems using velocity information been well developed, application attenuation is limited because mechanisms are poorly understood. We have conducted ultrasonic transmission measurements with changing temperatures from 0°C to [Formula: see text] estimate effect liquids grown unconsolidated (unconsolidated sediment) and consolidated...
Application of seismic attenuation estimation using sonic waveform data is limited because the methods have not yet been fully developed. Although median frequency shift method considered to be effective and robust compared conventional spectral ratio method, we demonstrated that strongly depend on reference under lower signal-to-noise ratios. We modified an existing arbitrarily choosing a value quantify uncertainties in estimation. Furthermore, implied optimum selection receiver pairs used...
SUMMARY Recent advancements in various types of seismic measurement methods, such as sonic logging, vertical profiling (VSP) and surface surveys, have allowed the high-quality wave propagation over a broad frequency range. To elucidate relationship between captured by methods at widely different frequencies highly heterogeneous zones (e.g. fractures, vuggy zones) developed carbonate reservoirs, laboratory measurements been conducted However, existing measure effective properties an entire...
Although seismic attenuation measurements have great potential to enhance our knowledge of physical conditions and rock properties, their application is limited because robust methods for improving both the resolution accuracy estimates not yet been established. We propose estimation zero-offset vertical profile (VSP) data by combining interferometry (SI) modified median frequency shift (MMFS) method developed using sonic waveform data. The configuration VSP redatumed that logging...
Intrinsic attenuation has the potential to clarify physical properties of earth materials, whereas positive utilization seismic scattering been recognized as useful in investigating heterogeneities thereof. However, it not easy separate between intrinsic and effects. The zero-offset vertical profiling (VSP) survey is be ideal for estimation because VSP observes direct waveforms propagating through subsurface formations. most popular method separating generates numerical data from known...
Large-scale solid bodies on Earth such as volcanoes and man-made pyramids have been visualized with earth muography, the recently invented technique, acqueous has already demonstrated its capability to visualize ocean tides tsunami. In this work, atmospheric a technique monitor vertical profile of tropic cyclones (TCs) is presented for first time. The density distribution time-dependent behavior several TCs which had approached Kagoshima, Japan, investigated muography. resultant...
Summary Gas-bearing sediments in shallow-water environments have recently attracted attention from the perspectives of energy resources, potential geohazards, and climate change. Our laboratory measurements demonstrate for gas-bubble manipulation gas-bearing sands via radiating repeated pulse signals. By monitoring temporal changes waveform ultrasonic irradiation with a dominant frequency 100 kHz transmitted through sand, we observe amplification shift toward recorded waveforms over 880 h....
I have used full waveform logs from the Nankai Trough exploratory well off central Japan to estimate both compressional and shear attenuation in sediments containing methane hydrate (MH). The estimates are based on a median frequency shift amplitude spectrum of recorded waveforms. This paper is concerned with at sonic frequencies 10–20 kHz for waves 500–1000 Hz waves. observed that presence MH increases host sediments' seismic attenuation, may be more helpful than detecting or characterizing...
Seismic attenuation is not due entirely to intrinsic properties; a component scattering effects included. Although different techniques have been used experimentally investigate the of seismic waves, so many laboratory measurements taken into account effect attenuation. Herein, partially frozen brine as solid-liquid coexistence system phenomena. We obtained series 2D apparent diffusion coefficient (ADC) maps ice-brine coexisting using diffusion-weighted magnetic resonance imaging (DW-MRI)...
Interest has rapidly grown in the use of unconventional resources to compensate for depletion conventional hydrocarbon (“easy hydrocarbon”) that are produced at relatively low cost from oil and gas fields with large proven reserves. When one wants ensure prospects development potentially vast terms their energy potential, it is essential determine quality energy. Here we consider shale gas, an resource particularly strong interest late, through analysis its return on investment (EROI), a key...
ABSTRACT In this study, we derived accurate and high‐resolution attenuation profiles using spectral ratio, centroid frequency shift, seismic interferometry methods. We utilized high‐quality vertical profiling sonic waveform data acquired in a carbonate reservoir located Abu Dhabi, United Arab Emirates. The scattering profile of vertical‐seismic‐profiling contributes significantly to wave that can be explained by high heterogeneity the rocks. also correlates well with lithology fractured...