. Early geophysical papers of the Society of Exploration Geophysicists . "^Difference in depth mailable JC0'^ Oiffimam n <fci* *wlaH«' for me»»oremenl far m«*»uren<«nt Fig. 4.—"Correlation" and "dip" methods of procedure. tances. In areas where limestone members are continuous and where correlation of well logs by lithology is possible this method of inter- pretation is also possible. In fact, we may look upon a reflexion seismo- gram as a derivative of the lithological log of the stratigraphical column being penetrated by the reflected waves. In areas where lith
. Early geophysical papers of the Society of Exploration Geophysicists . "^Difference in depth mailable JC0'^ Oiffimam n <fci* *wlaH«' for me»»oremenl far m«*»uren<«nt Fig. 4.—"Correlation" and "dip" methods of procedure. tances. In areas where limestone members are continuous and where correlation of well logs by lithology is possible this method of inter- pretation is also possible. In fact, we may look upon a reflexion seismo- gram as a derivative of the lithological log of the stratigraphical column being penetrated by the reflected waves. In areas where litho- logical correlation cannot be carried over complete structures the same limitations will pertain to the interpretation of reflexion shooting data. For such areas the technique of "dip" shooting has been developed. This involves the very accurate determination of the running time of events reflected from adjacent points on a reflecting surface. Figure 4 will assist in visualising the differences of these methods, and to those familiar with core drilling the analogy between core-drill mapping where a recognisable marker is available and mapping by dips meas- ured on core samples gives a fair representation of the relative power of tne two methods of attack. MAPPING BY CORRELATION Experience has shown that where events on seismograms can be correlated with certainty, all other processes of the method can be 800
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