ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1971.tb00599.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1971.tb00600.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractA review of the most significant mathematical properties of digital operators and an introduction to their important applications to seismic digital filtering is given.Basic definitions in the time‐series field and the principles of digital filtering are introduced starting from theZ‐transform domain.Predictive decomposition for stationary stochastic processes and inverse operators are also discussed.Applications of digital filtering to seismic signal concern the predictive deconvolution, characteristics of dispersive and recursive operators, matched filters, and multichannel operators.A brief discussion on frequency, wave number, and velocity filtering phylosophy is given at the end of the pa

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1971.tb00601.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractApparent resistivity measurements with the square array technique in the vicinity of a dipping interface have the advantage over collinear array methods that they are less dependent on orientation of the array.In order to exploit this, existing potential solutions for the dipping interface problem have been adapted for the computation of apparent resistivities over such a feature using a square array.Comprehensive interpretation techniques covering this problem are given and the limitations imposed by residual array orientation effects are discussed.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1971.tb00602.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractA seismic refraction line fired using conventional explosive charges was repeated using a seismic cord, “Aquaflex”. It was found that travel times and frequencies were the same for both kinds of source and that amplitudes from “Aquaflex” were comparable with those produced using conventional explosives more than ten times the weight. This advantage carries with it gains in cost and efficiency and reduces damage to

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1971.tb00603.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractMulticover measurements in refraction shooting are comparable to long‐spread reflection shooting. Of course, spread length, distance of traces and offset may be larger than in reflection shooting and depend on the, depth, the velocity and the dipping of the refractors to be detected. For later processing an equation for the refractor velocity is derived in case of flat and steep dipping refractors. The depth and the angle of dip will be computed from delay times. An outlook to digital processing is give

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1971.tb00604.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractThe general use of continuous CDP seismic lines means that the neighbourhood of each depth point can be considered according to two sets of co‐ordinates:— the co‐ordinates of the abscissa on the seismic lines and the reflection time, which allow investigation of the local dip of coherent events;— the co‐ordinates of the reflection time and the move out, which allow investigations of the average velocity for these same events.The combination of both investigations for each coherent event is a very convenient operation for the seismologist, and can provide some useful interpretation aids such as velocity profiles, or information on the interval velocities.The principles which we use consist in the examination of a large range of possibilities, of which only the most coherent are chosen.Some examples

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1971.tb00605.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractAt the EAEG meeting in Venice (May 1969) Linsser presented a new method for the interpretation of seismic measurements (“Transformation of Seismic Data into Geological Models by Digital Template Analysis”). First results were presented during the S.E.G. convention in Calgary (September 1969). Meanwhile some experience concerning the possibility of the application of this method is available.Starting from the fact that the computer is able to store several physical parameters (amplitude, wave‐length, direction of the seismic event, coincidence with a template and the beginning and the end of each reflection), the importance of these data for the investigation of special geophysical questions will be discussed.This method has been tested with several examples on the following problems:1Proving and exact localisation of faults.2Investigation of velocities of interesting layers.3Additional information for the geological interpretation of seismic sections.4Picking of weak reflections in the “Pre‐Zechsteinian” in Northern Germany.Finally the possibilities of further applications and developments ar

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1971.tb00606.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractHarmonic steady‐state solutions for magnetic and electric vector components are obtained for a layered transitional earth in a vertical magnetic dipole field. The conduction currents dominate the displacement currents. The time factor eiωtis implied. MKS units are us

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1971.tb00607.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

AbstractIn recent times, velocity surveys at marine well locations have been performed using non‐explosive energy sources such as air‐guns and gas guns. In addition, surveys in land wells have been successfully carried out using a modified version of the air‐gun. This paper illustrates some of the characteristics of these devices and compares the data obtained from typical surveys with conventional dynamite surveys.Since data obtained from well velocity surveys using non‐explosive sources are now commonly recorded on tape, they lend themself to further digital processing and interpretation techniques that were not previously so conveniently available. Some examples of these processes, e.g. the examination of attenuation, frequency and energy content of the recorded well geophone signals, are given in the paper. Examples of some other digital processes, using calibrated Acoustic logs, whether recorded digitally in the field or subsequently converted from analogue recordings, are also given in the paper. These include the construction of an Acoustic log in the vertical axis from logs obtained in deviate

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1971.tb00608.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY