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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 49 (1965)

Issue: 2. (February)

First Page: 126

Last Page: 138

Title: Adjustment of Electric Log Values for Preparation of Subsurface Facies Maps

Author(s): David R. Matuszak (2)

Abstract:

A study of subsurface facies maps prepared from electric logs suggests that some of the variability in the observed data can be reduced if the amplitude of the self-potential deflections of all beds of given lithology are first adjusted to approximately the same relative magnitude. An IBM 650 program was developed to perform this adjustment, using standard correction charts supplied by Schlumberger Well Surveying Corporation. The program computes 40 compositional variables that can be used for a variety of facies maps. Three examples, involving sand percentage, sand isolith, and number-of-sands in part of the Desmoinesian (Middle Pennsylvanian) of southern Oklahoma are presented to illustrate that use of the adjusted electric log values yields facies maps that are less "n isy" than maps prepared directly from the raw data.

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