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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 56 (1972)

Issue: 8. (August)

First Page: 1541

Last Page: 1544

Title: Correlation Sections and Log Maps in Determination of Sandstone Trends: GEOLOGICAL NOTES

Author(s): John W. Shelton (2)


Correlation sections of sandstone-bearing intervals, using very closely spaced electric logs, permit simultaneous examination of many logs for subtle but meaningful log characteristics. Such an approach is thought to improve the capability for determining sandstone trends and to have more potential than conventional isopach maps in estimating sandstone edges. Modification generally required of commercial logs includes elimination of the channel and other space along the central part of the log, elimination of the grid for determining values of self-potential, resistivity, and conductivity, and termination of curves opposite extreme deflections. It is also helpful in some cases to shade areas inside a given curve. In thick sandstone intervals the scale should be reduced fo a meaningful overview. In short, preparation of correlation sections requires data processing which is somewhat analogous to that used in preparation of seismic cross sections. Stratigraphic exploration and exploitation will be enhanced if and when service companies perform custom logging for the geologist mapping sandstone trends and edges. Now in the preparation of correlation sections, some of the log features usually are lost by the tracing of curves.

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