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• W2335877183 abstract "Under certain simplified but realistic physical assumptions, the basic data from continuous velocity surveys in wlls can be used to simulate the variations in acoustic impedance in the ground which give rise to seismic reflections. An analogue computer is described which makes use of the basic well data to produce synthetic seismic records which resemble actual seismograms from shothole explosions. This process provides an interesting insight into the requisite physical conditions, as well as the physical processes, whereby seismic reflections are set up in the earth. The close relationship between seismograms and well logs is brought out. Illustrations are given of field results. IKTKODUCTION The basic concepts of the reflection seismograph method are relatively simple and straightforward. A charge of dynamite is exploded at A (Figure I) and the resulting seismic pulse travels outwards as a wave in all directions. The wave is reflected at Horizon B and travels upwards towards the surface. The reflected wave is received by seismometer spread C-C, and recorded by instruments in truck E. However, as we deal day by day with seismograms recorded from actual explosions in the real earth, it becomes apparent that there are a number of complicating factors which enter into the reflection seismograph process. In order more fully to understand and interpret the data on seismograms it is necessary that we look closely into all phases of the process. For example, what is the form of the seismic pulse radiated from the shotpoint? How does it change during transmission through the earth? $‘hat is the nature of the reflection process in multiple-layered rocks? What are the characteristics of extraneous seismic waves and “noise”? What are the effects of the recording instrument system on the reflection data? A complete analysis of these factors would encompass the entire field of reflection seismology. The following discussion will be limited more sl~ecifically to the reflection process itself in multiple-layered rocks in the light of accurate and detailed velocity information now available from continuous intervalvelocity logging equipment. Certain aspects of the shotpoint and recording processes that are directly connected with the over-all problem will also be discussed." @default.
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• W2335877183 date "1954-01-01" @default.
• W2335877183 modified "2023-09-26" @default.
• W2335877183 title "THE SYNTHESIS OF SEISXIOGKAMS FRO11 U'ELL LOG DATA*" @default.
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