摘要:

AbstractThe aim of the present investigation is to examine the significance of the second derivative for the purpose of the prospective determination of the geological properties of the district of Offenburg, which are relatively wellknown as a result of both reflection seismic and bore profile findings.The calculation of the second derivative is carried out by means of three approximation formulae, which are compared with each other. In contrast to the isogam map the second derivative shows some additional characteristics, whose structural significance illuminates the comparison with the results of reflection seismics.A geological profile constructed on the basis of 6 wells completely confirms the geophysical findings.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01276.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe paper consists of an account of a resistivity investigation into an old river valley in Coal Measure strata. This valley denuded several of the upper coal seams leaving behind unconsolidated material and it was the purpose of the work to be described to investigate how far the extent and nature of this material could be determined by resistivity methods conducted at the surface.As such the survey fits into a wider programme of research instigated by the National Coal Board.The feature, which is quite well known geologically, was surveyed by conventional methods and the results obtained are discussed in relation to the above project.Thus, the investigations succeeded in tracing the approximate centre line of the feature and in yielding some information on the nature and order of thickness of the deposits. Limitations of the method and its future application are also discussed.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01277.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe writer classifies problems of geophysical interpretation. He distinguishes four fundamental problems and indicates the methods of solving them. Among these methods he refers to classical methods and methods based on the writer's theoretical work.The geophysical examples are developed, as well as the very simple numerical examples. Methods of enumeration are also referred to. The whole object is to show that the practical application of the geophysical methods suggested will not give prospectors any difficulty.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01278.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe results obtained from a number of seismic velocity well‐logging surveys and adjacent refraction sections are compared. The velocities derived by these two methods for a certain layer are found to differ appreciably. This is shown by presenting the time‐depth relations of the well‐surveys and the time‐d stance relations of the refraction sections at three locations, plotted on graphs with sloping depth‐ and dist

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01279.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe formulas derived by the author in a preliminary paper for taking into consideration refraction when dealing with the problem of a vertical plane are extended to the three‐dimensional case. Vector analysis is extensively applied. Among others it is shown that in the general case the 3 horizontal twodimensional vectors, i.e.1) the gradient of the time of reflection2) the direction of true dip3) the vector from the shot point to the projection of the reflecting point, point into 3 different dir

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01280.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY