ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01285.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01286.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe common notion, that the regional anomaly must be as regular as possible, can be translated into mathematical language by requiring that the regional anomaly shall be represented, over a not too large area, by a surface of the second or of the third degree. The residual anomaly is commonly defined by the requirement that its horizontal dimensions must be as small as possible. This implies that also its amplitude should be small. This requirement may be moulded into a mathematical form by stating that the square of the difference between the Bouguer anomaly and the regional anomaly, integrated over a certain area, must be a minimum. On these two definitions an analytic method is based for deriving the regional anomaly. Practical computation procedures are presented.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01287.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractExploration of the Catania region was carried out for over a year by means of electrical soundings. The thickness of the overburden (lava and alluvium) was thus computed and the contour map of the blue clays basement shows the existence of several buried channels where new wells were drilled, all of them successful.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01288.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe geophysicists who attempted to evaluate elastic anisotropy of some bedded formations most often gave but little information about recording and interpretating the measurements.May be they did not lay enough stress on the fact that any determination of the anisotropy factor is a critical operation and that, to have some certainty. it must be made under good conditions and then discussed.Due to the very favourable conditions offered: undisturbed tectonics and topography, relatively regular series the Berriane district in Northern Sahara, is rather well suited to accurate measurements and to an anisotropy study down to 1,250 meters. Since measurements have been carried out in the wildcat drilled at Berriane by S. N. Repal, it seems interesting to communicate the results obtained and to discuss them according to the influence of high velocity layers.It can be noted that in the clay and sand series which have been investigated, anisotropy coefficient amounts to 1.09 or so.To conclude, it seems desirable that determinations made by numerous operators should allow a more accurate knowledge of the anisotropy factor in the main types of rocks.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01289.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY