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Shear Wave Logging In Semi-Infinite Saturated Porous Formations 

Schmitt, D. P.; Zhu, Y.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
Recent theoretical and experimental studies have demonstrated the interest of using non-axisymmetric sources, such as dipole and quadrupole, to record shear wave events in any kind of formation (fast or slow). Non-axisymmetric ...
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Application Of Rayleigh's Principle To Guided Waves In A Borehole 

Ellefsen, K. J.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)
The Lagrangian for guided waves in a completely general borehole model is presented. Rayleigh's principle is used to derive the first order perturbations in wavenumber and frequency due to slight perturbations in the ...
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Viscous Attenuation Of Acoustic Waves In Suspensions 

Gibson, Richard L. Jr.; Toksoz, M. Nail (Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)
A model for attenuation of acoustic waves in suspensions is proposed which includes an energy loss due to viscous fluid flow around spherical particles. The expression for the complex wavenumber is developed by considering ...
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New Applications In The Inversion Of Acoustic Full Waveform Logs - Relating Mode Excitation To Lithology 

Paillet, Frederick L.; Cheng, C. H.; Meredith, J. A. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1986-01-01)
Existing techniques for the quantitative interpretation of waveform data have been based on one of two fundamental approaches: 1) simultaneous identification of compressional and shear wave velocities; and 2) least-squares ...
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Full Wave Synthetic Acoustic Logs In Saturated Porous Media Part Ill: Pore Shape And Pore Geometry Effects 

Schmitt, D. P. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1986-01-01)
Homogenization theory states that the viscous and mass coupling coefficients of a fully saturated porous medium depend upon the pore shape and the pore geometry. Using an approximate formula, the three body wave velocities ...
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Full Wave Synthetic Acoustic Logs In Saturated Porous Media Part II: Simple Configuration 

Schmitt, D. P. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)
The discrete wavenumber method is used to compute synthetic full waveform acoustic logs in an axisymmetric fluid-filled borehole surrounded by a porous medium. The two phase formation is modeled following Biot's theory. ...
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A Finite Difference Formulation of Biot's Equations for Vertically Heterogeneous Full Waveform Acoustic Logging Problems 

Stephen, R. A. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
In this paper we present a finite difference formulation for Biot's equations for wave propagation in saturated porous media which vary in range and depth. One objective of well logging petroleum exploration holes is to ...
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Report Summary 

Toksoz, M. N.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)
This report contains the results of work completed during the fourth year of the Full Waveform Acoustic Logging Consortium in the Earth Resources Laboratory at M.LT. This is the first year of the second phase of the ...
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Modelling Of Full Waveform Acoustic Logs In Soft Marine Sediments 

Cheng, C. H.; Wilkens, R. H.; Meredith, J. A. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)
Full waveform acoustic logs obtained from the Deep Sea Drilling Project (DSDP) were modelled using synthetic full waveform acoustic logs. These synthetic logs were calculated using the discrete wavenumber method. The model ...
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Synthetic Acoustic Logs Over Bed Boundaries And Horizontal Fissures 

Stephen, R. A. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)
The finite difference method is used to predict the effects of wave propagation in boreholes with vertically varying elastic properties. Specifically horizontal interfaces between rock types (for example shales and sandstones) ...
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AuthorCheng, C. H. (54)Toksoz, M. N. (20)Schmitt, D. P. (10)Toksoz, M. Nafi (10)Burns, D. R. (8)Ellefsen, K. J. (7)Wilkens, R. H. (7)Tang, X. M. (6)Paillet, Frederick L. (5)Stephen, R. A. (4)... View MoreDate Issued1987 (19)1985 (15)1988 (13)1989 (13)1984 (12)1986 (12)1983 (11)Has File(s)Yes (95)

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