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After many years of emphasis on the improvement of geophysical field techniques and instrumentation, new geophysical methods simplify and improve geological interpretation of geophysical data.
The gravity analog computer gives almost instantaneously the theoretical gravity anomaly of complex structures. Examples are shown.
Seismic magnetic recording and replay, variable-density and variable-area recording cameras permit presentation of seismic data in a form which simulates geological cross sections and stimulates geological interpretation. Examples of variable density and standard trace cross sections are given. While variable density cross sections simulate geological cross sections, their limitations must be understood and proper dip migration made where necessary. A new plotter is described which facilitates such corrections.
New seismic techniques afford a promising approach to the location of stratigraphic traps. Synthetic reflection records made from continuous velocity logs indicate the possibility of determining the presence or absence of a sand from seismic reflection records. Variable density cross sections reveal stratigraphic changes usually unnoticed on standard trace cross sections. Examples of such applications are portrayed and discussed.
The improved techniques of data presentation may be used to review old standard seismic records by employing a new device which converts such records into corrected variable density cross sections or into magnetic tapes for further replay.
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