ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1966.tb01758.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1966.tb01759.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

ABSTRACTFormulae of the energy spectrum and autocorrelation function have been derived for magnetic anomalies due to four classes of bodies which can be represented in turn by (a) poles, (b) line of poles, (c) dipoles and (d) line of dipoles. The effects of the depth and dimensions of the magnetized sources on the spectrum and the autocorrelation function have been studied. In the case of the dipole models, the orientation of the polarization vector casts a significant influence on the characteristics of the two functions. In all cases, however, the functions change in size and shape as the inclination and declination of the geomagnetic vector are varied.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1966.tb01760.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

ABSTRACTThe term “structure”, as used here, includes synclinal and anticlinal folds and folding in general, faults, cross fractures and various conditions associated with intrusions. Structure, both regional and local, has a very important role in emplacement of mineralization. Under certain circumstances which occur fairly commonly, structural conditions are reflected significantly in the trends and intensities apparent on aeromagnetic maps. A number of documented illustrations based on Canadian Shield conditions are discussed. Illustrations are drawn from areas of known geology and from proven mining camps, as well as from loci of recent discoveries. Canadian examples are chosen because of existence and availability of extensive aeromagnetic cover, although it is logical to extend the argument to other shields and indeed to regions of other geological, but similar magnetic character.The importance of aeromagnetics in structural approach to exploration and the correctness of such approach seem to be fully substantiated by results discus

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1966.tb01761.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

ABSTRACTThe paper describes a transistorised, portable proton precession magnetometer constructed for surface geophysical prospecting. Constructional and circuit details are furnished. The readout of the instrument is digital. The accuracy of measurement is ± 1 part in 20,000. The maximum gradient of the total field under which a satisfactory measurement can be made is about 1 gamma/cm. The sensing head uses a single coil system with distilled water as the proton sample

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1966.tb01762.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

ABSTRACTThe knowledge of hydraulic and electric properties of porous media and the relations between them is essential for the quantitative evaluation of electric well logs and the solution of other reservoir engineering problems. The state of the art in this field is not yet satisfying. Theories still show considerable discrepancies with practice due to oversimplified model approaches. Empirical relations are either too coarse, not fully determined, or valid under specific geological and geographical conditions only. This article deals with the development of a general theory of the electric and hydraulic resistance behavior of porous media on the basis of a very general statistical network model. A general solution of the relations between formation factor, permeability, and porosity is presented by means of a rigorous mathematical treatment of two limiting cases of such a network. The solution shows that the product of the formation factor and the permeability can be expressed in the expectation values and the variation coefficients of pore channel cross section and shape factor and by a network factor, that depends on the mesh texture of the network. This network factor is in the range zero to one. It is further shown that the path length increase enters both the electric and the hydraulic tortuosity by its square.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1966.tb01763.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1966.tb01764.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1966.tb01765.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

Book review in this articleJ. L. Worzel,Pendulum Gravity Measurements at Sea, John Wiley&Sons, London and New York, 1965, Price 210 sh.D. S. Parasnis,Mining Geophysics, Elsevier Publishing Company, Amsterdam‐London‐New York, 1966, XVI + 356 pages, 11 tables, 128 illustr., Price N. fls. 50,–.K. Ya. Kondrat'yev,Radiative Heat Exchange in the Atmosphere, Leningrad, English edition, Pergamon

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1966.tb01766.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY