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- Volume 12, Issue 1, 1964
Geophysical Prospecting - Volume 12, Issue 1, 1964
Volume 12, Issue 1, 1964
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A LABORATORY STUDY OF STREAMING POTENTIALS*
More LessABSTRACTThe magnitude of the streaming potential due to the passage of a liquid through a porous medium is examined, under conditions similar to those found in an aquifer under the action of a pumping well. Three models simulate flow in channels, conduits, and unconfined aquifers for several grain sizes of sands and for several resistivities of fluids. The ratio of the streaming potential to the pressure difference is constant for a selected sand and fluid, decreases as grain size increases, is essentially independent of the geometry of the flow, increases slightly as the permeability decreases, and decreases as the salt concentration increases. Extremely low streaming potentials can be expected near a pumping well.
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PROPRIETES DE FILTRAGE DES FORMULES UTILISEES POUR LA TRANSFORMATION DES CARTES GRAVIMETRIQUES*
By HENRI NAUDYAbstractIn order to characterize the anomalies of the initial map and the transformed map, clearness factors named respectively I0 and I are defined and the ratio I/I0 is examined for various formulae applied to three typical anomalies (sphere, anticlinal, fault). The curves obtained make it possible to use an analogy with electric circuits, thus introducing the notions of cut‐off depth and slope.
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VISCOELASTIC PROPERTIES OF THE STANDARD LINEAR SOLID*
By TSVI MEIDAVABSTRACTThis study is an attempt to find a phenomenological model which will behave in a manner similar to that of common earth materials in regard to the dependence of attenuation and phase velocity on frequency.
An analysis of two commonly employed rheological models, Maxwell's and Kelvin‐Voigt's and their variants, is presented indicating that these models are too simple to conform phenomenologically to the behavior of rocks. It is shown that a linear combination of the Maxwell and Kelvin‐Voigt models, known as the standard linear solid, comes closer to giving an adequate description of the behavior of some earth materials, than either one of the two models.
A method of determining the viscoelastic constants of a solid is presented provided that its attenuation and dispersion curves are known. The viscoelastic constants (relaxation times and/or viscosity coefficients) of the solid are determined by superimposing the experimental curves on master curves, and reading the constants off the theoretical curves.
An analysis of published experimental data is presented, indicating that the present model is capable of accounting for at least some attenuation and dispersion phenomena.
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EXAMPLES OF SYNTHETIC REFRACTION ARRIVALS AND WIDE‐ANGLE REFLECTIONS*
By R. BORTFELDAbstractThe exact responses of plane interfaces to incident spherical compressional waves are calculated by an electronic computer. The reflected part of the response is shown for various positions of the ‘shot’ and of the ‘receiver’ as well as for various velocity contrasts. This makes it possible to study some features of the reflection process, especially the behaviour beyond the critical angle.
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SERIES FOR THREE‐DIMENSIONAL MIGRATION IN REFLECTION SEISMIC INTERPRETATION*
More LessABSTRACTThe problem of three‐dimensional migration is solved for arbitrary, three‐dimensional, continuously differentiable velocity functions v=v (x4) by means of series.
The derived formulae are applied to numerical examples.
The possibility of approximating real, discontinuous velocity distributions by continuous functions is mentioned and illustrated by an example.
The application of electronic computers, which is necessary due to the complexity of the formulas, is discussed.
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BOOK REVIEW
Book received in this Articles:
P. E. Potter and F. J. Pettijohn, Paleoccurrents and Basin Analysis
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Volume 39 (1991)
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Volume 34 (1986)
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Volume 33 (1985)
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Volume 32 (1984)
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Volume 31 (1983)
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Volume 30 (1982)
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Volume 29 (1981)
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Volume 28 (1980)
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Volume 27 (1979)
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Volume 26 (1978)
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Volume 25 (1977)
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Volume 24 (1976)
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Volume 23 (1975)
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Volume 22 (1974)
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Volume 21 (1973)
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Volume 20 (1972)
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Volume 19 (1971)
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Volume 18 (1970)
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Volume 17 (1969)
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Volume 16 (1968)
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Volume 15 (1967)
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Volume 14 (1966)
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Volume 13 (1965)
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Volume 12 (1964)
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Volume 11 (1963)
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Volume 10 (1962)
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Volume 9 (1961)
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Volume 8 (1960)
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Volume 7 (1959)
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Volume 6 (1958)
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Volume 5 (1957)
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Volume 4 (1956)
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Volume 3 (1955)
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Volume 2 (1954)
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Volume 1 (1953)