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Author: Michel Auberger
Publisher:
ISBN:
Category : Rock mechanics
Languages : en
Pages : 66
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Book Description
Author: Michel Auberger
Publisher:
ISBN:
Category : Rock mechanics
Languages : en
Pages : 66
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Book Description
Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1256
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Author: Yuki Kobayashi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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This dissertation describes theoretical developments, numerical simulations, and a field case study on the effect of mesoscopic-scale medium heterogeneity on seismic velocity and attenuation. We focus on the relationship between the wave properties and water saturation. There are three approaches for the study of the effect mesoscale heterogeneity: regular geometry models, branching approaches, and statistical approaches. We develop a hybrid model providing velocity dispersion and attenuation in partially saturated rocks based on the last approach. It will be called Bounds-Averaged Dynamic-Equivalent-Medium Approach (BA-DEMA) and the variable characteristic length model. The developed model has advantages of both the branching and the statistical approaches; it has the appropriate low and high frequency limits; it has an analytical interpolation function which gives appropriate frequency dependence both in low and high frequency regimes, the interpolation function is defined with measurable parameters; and most of all, the mathematical expression is quite simple. These features are the advantages of the new model that would be enough to be recommended for the future use to predict seismic velocity and attenuation in multiphase-fluid saturated media. Forward seismic modeling is an inevitable step to connect rock's properties and their spatial distribution with observable seismic signatures. We describe a practical workflow to evaluate the effects of wave-induced fluid flow. It will serve as a practical guide in forward seismic attenuation modeling. Compared to classical forward seismic modeling procedures, two additional steps are required in attenuation modeling: permeability modeling and estimating dry rock heterogeneity scale. Many authors are trying to develop sophisticated algorithms to extract reliable attenuation information, and broad band seismic data is increasingly available even in exploration projects. The quantitative use of attenuation information derived from surface reflection seismic data is still quite challenging; however, it will become reality in the near future, where forward attenuation modeling discussed in this dissertation will become important. Not only surface reflection seismic but also other techniques such as vertical seismic profile or cross-well seismic profile are utilized to infer subsurface elastic properties and provide the useful information across a target reservoir or the overburden. The latter techniques use high frequency seismic pulse and transmitted waves, which are preferable in attenuation studies and open the possibility of extracting attenuation information more accurately. Recently, attenuation of full-waveform sonic data is also attracting attention. Procedures for the forward attenuation modeling shown in this dissertation can also help the analyses and the interpretations of the different seismic surveys.
Author: Nick Barton
Publisher: CRC Press
ISBN: 1134160135
Category : Technology & Engineering
Languages : en
Pages : 729
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Book Description
Seismic measurements take many forms, and appear to have a universal role in the Earth Sciences. They are the means for most easily and economically interpreting what lies beneath the visible surface. There are huge economic rewards and losses to be made when interpreting the shallow crust or subsurface more, or less accurately, as the case may be.
Author: United States. Federal Highway Administration. Offices of Research and Development
Publisher:
ISBN:
Category :
Languages : en
Pages : 628
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Author: Qiuliang Yao
Publisher:
ISBN:
Category :
Languages : en
Pages :
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My dissertation focuses on establishing a link between the rock heterogeneities and the fluid flow-related velocity dispersion and wave attenuation in sedimentary rocks, through both theoretical and experimental studies. From theoretical studies, I found that the frequency dependency of velocity or modulus is ultimately determined by the amount of additional support the porous frame gets from the fluid, if the fluid is allowed to flow in or out of the pore. An incoming fluid flow stiffens the frame and an outgoing flow softens the frame. A frequency-dependent "Dynamic Fluid Modulus" (DFM) can effectively describe this effect, and model the fluid flow-related velocity dispersion and wave attenuation. Using DFM, the application of Gassmann's equation is extended from homogeneous to heterogeneous rocks. More importantly, the DFM can be easily and deterministically inverted from measured data. The inverted result is a good indicator of the degree and distribution of heterogeneities in the rock. For experimental studies, a low frequency measurement system was developed at The University of Houston Rock Physics Lab. This system can measure the velocities and attenuation in rock samples at seismic frequency range (2-500 Hz). As an essential part of the system, a virtual lock-in amplifier was developed to improve the quality and efficiency of the data acquisition and processing. Its performance was carefully evaluated with synthetic and real data. The random errors in our measurements are controlled to be equal or better than published data. The systematic errors on attenuation (phase) are calibrated to remove the electronic circuit effects. The systematic errors on velocities (amplitude) have to be calibrated with velocities measured at ultrasonic frequency for dry samples. Tests on aluminum, Lucite, and sandstone samples demonstrated that this system can successfully capture the velocity dispersion and attenuation coming from the various fluid flows in sedimentary rocks.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 456
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Scott Blouin
Publisher:
ISBN:
Category : Earth movements
Languages : en
Pages : 100
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Author: Jose A. Sanchidrian
Publisher: CRC Press
ISBN: 1482288699
Category : Science
Languages : en
Pages : 873
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Book Description
This volume contains the papers presented at the 9th International Symposium on Rock Fragmentation by Blasting, held in Granada, Spain, 13-17 August 2009. A state-of-the-art collection of articles on developments in rock blasting and explosives engineering, with contributions on rock characterization, explosives and initiation systems, blast design and monitoring, fragmentation assessment, numerical modeling, vibrations from blasting, environmental and economical aspects of rock blasting, and more. Containing unique knowledge, case studies, ideas and insights, this volume is must-have literature for researchers and practitioners in the field of explosives and blasting.
Author: Juergen H. Schön
Publisher: Elsevier
ISBN: 044453797X
Category : Science
Languages : en
Pages : 494
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Book Description
Physical Properties of Rocks: A Workbook is a symbiosis of a brief description of physical fundamentals of rock properties (based on typical experimental results and relevant theories and models) with a guide for practical use of different theoretical concepts. For this purpose a companion web site contains a selection of model based equations in excel worksheets for practical application and training by the user to work with his own data (or to ''play" in order to demonstrate the effects of various input information and to demonstrate the effects of various input information in petrophysical work. In two special chapters the problem of relationships between petrophysical parameters based on various model concepts is presented as a foundation for combined interpretation. This part also contains the author's 'structured model'. The workbook is a result of the more than 40 years experience of the author in teaching at universities and industrial courses. Presents all practical relevant properties of rock in one volume Experimental and theoretical fundamentals in a systematic framework Special focus on relationships between properties
